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Journal articles on the topic 'Quantum coherent communications'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

Djordjevic, Ivan B. "LDPC-Coded Optical Coherent State Quantum Communications." IEEE Photonics Technology Letters 19, no. 24 (2007): 2006–8. http://dx.doi.org/10.1109/lpt.2007.909688.

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2

Pittaluga, Mirko, Yuen San Lo, Adam Brzosko, et al. "Long-distance coherent quantum communications in deployed telecom networks." Nature 640, no. 8060 (2025): 911–17. https://doi.org/10.1038/s41586-025-08801-w.

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3

Sidhu, Jasminder S., Michael S. Bullock, Saikat Guha, and Cosmo Lupo. "Linear optics and photodetection achieve near-optimal unambiguous coherent state discrimination." Quantum 7 (May 31, 2023): 1025. http://dx.doi.org/10.22331/q-2023-05-31-1025.

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Coherent states of the quantum electromagnetic field, the quantum description of ideal laser light, are prime candidates as information carriers for optical communications. A large body of literature exists on their quantum-limited estimation and discrimination. However, very little is known about the practical realizations of receivers for unambiguous state discrimination (USD) of coherent states. Here we fill this gap and outline a theory of USD with receivers that are allowed to employ: passive multimode linear optics, phase-space displacements, auxiliary vacuum modes, and on-off photon det

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Scalari, Giacomo, Urban Senica, Andres Forrer, et al. "THz frequency combs for integrated coherent photonics." SPG Mitteilungen - Communications de la SSP 70 (July 1, 2023): 42–47. https://doi.org/10.5281/zenodo.10086365.

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5

Эскандери, М. М., Д. Б. Хорошко та С. Я. Килин. "Безошибочное различение когерентных состояний двухмодового оптического поля". Журнал технической физики 128, № 8 (2020): 1171. http://dx.doi.org/10.21883/os.2020.08.49716.83-20.

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The procedure of a quantum measurement, the unambiguous state discrimination, is studied for the case of four two-mode coherent states of the optical field, interesting for information transmission via an optical communication channel. It is shown that a complex conjugation of the amplitude of one of the modes results in a better distinguishability of the states. An interferometric scheme is suggested for unambiguous discrimination of such states and the probability of successful discrimination is found. Applications of the considered state set are discussed for quantum cryptography, quantum t

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6

Kato, Kentaro. "Non-Orthogonality of QAM and Sunflower-like Modulated Coherent-State Signals." Entropy 27, no. 1 (2025): 30. https://doi.org/10.3390/e27010030.

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The limitations of cloning and discriminating quantum states are related to the non-orthogonality of the states. Hence, understanding the collective features of quantum states is essential for the future development of quantum communications technology. This paper investigates the non-orthogonality of different coherent-state signal constellations used in quantum communications, namely phase-shift keying (PSK), quadrature-amplitude modulation (QAM), and a newly defined signal named the sunflower-like (SUN) coherent-state signal. The non-orthogonality index (NOI) and the average probability of

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7

PIRANDOLA, STEFANO. "A QUANTUM TELEPORTATION GAME." International Journal of Quantum Information 03, no. 01 (2005): 239–43. http://dx.doi.org/10.1142/s0219749905000815.

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We investigate a game where a sender (Alice) teleports coherent states to two receivers (Bob and Charlie) through a tripartite Gaussian state. The aim of the receivers is to optimize their teleportation fidelities by means of local operations and classical communications. We show that a non-cooperative strategy corresponding to the standard telecloning protocol can be outperformed by a cooperative strategy which gives rise to a novel (cooperative) telecloning protocol.

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Meddour, H., Sh Askar, S. Dehraj, et al. "Efficient two-dimensional Fraunhofer diffraction pattern via electron spin coherence." Laser Physics 33, no. 11 (2023): 116003. http://dx.doi.org/10.1088/1555-6611/acfd9a.

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Abstract In this letter, we have discussed the two-dimensional diffraction pattern via electron spin coherence in a GaAs quantum dot. Impulsive stimulated Raman excitation utilizing coherent optical fields is employed for the purpose of regulating the electron spin coherence within a charged ensemble of GaAs quantum dots, by means of an intermediate charged exciton (trion) state. We show that for the coupling two-dimensional standing wave (SW) field in the x and y directions, the two-dimensional Fraunhofer pattern can be formed for a weak probe light. By using the experimental parameters and c

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9

Vorontsova, I. O., R. K. Goncharov, D. V. Tupyakov, F. D. Kiselev, and V. I. Egorov. "Numerical approach to compound quantum repeater scheme with coherent states." Computer Optics 48, no. 1 (2024): 81–85. http://dx.doi.org/10.18287/2412-6179-co-1322.

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A numerical model of a quantum repeater operating with Schrödinger cat states is constructed. The model describes the performance of such a system in the presence of decoherence effects, namely, noise in the quantum channel and the efficiency of the photon-number-resolving detector. In the framework of the numerical model, a theoretical analysis of the system functioning is carried out for the elementary link by calculating its performance characteristics. Namely, we calculate photodetector click probabilities and fidelity for various sets of decoherence parameters. These estimates are necessa

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10

Becerra, F. E., J. Fan, and A. Migdall. "Photon number resolution enables quantum receiver for realistic coherent optical communications." Nature Photonics 9, no. 1 (2014): 48–53. http://dx.doi.org/10.1038/nphoton.2014.280.

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11

El-Nahal, Fady. "Coherent 16 Quadrature Amplitude Modulation (16QAM) Optical Communication Systems." Photonics Letters of Poland 10, no. 2 (2018): 57. http://dx.doi.org/10.4302/plp.v10i2.809.

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Coherent optical fiber communications for data rates of 100Gbit/s and beyond have recently been studied extensively primarily because high sensitivity of coherent receivers could extend the transmission distance. Spectrally efficient modulation techniques such as M-ary quadrature amplitude modulation (M-QAM) can be employed for coherent optical links. The integration of multi-level modulation formats based on coherent technologies with wavelength-division multiplexed (WDM) systems is key to meet the aggregate bandwidth demand. This paper reviews coherent 16 quadrature amplitude modulation (16Q

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12

Arvizu-Mondragón, Arturo, Francisco J. Mendieta-Jiménez, César A. López-Mercado, and Ramón Muraoka-Espíritu. "Quantum photonic communications with four-dimensional constellations of coherent states undergoing phase noise." Optics Communications 574 (January 2025): 131158. http://dx.doi.org/10.1016/j.optcom.2024.131158.

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13

AWSCHALOM, DAVID D. "CONTROLLING SPIN COHERENCE WITH SEMICONDUCTOR NANOSTRUCTURES." International Journal of Modern Physics B 22, no. 01n02 (2008): 111–12. http://dx.doi.org/10.1142/s0217979208046165.

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We present two emerging opportunities for manipulating and communicating coherent spin states in semiconductors. First, we show that semiconductor microcavities offer unique means of controlling light-matter interactions in confined geometries, resulting in a wide range of applications in optical communications and inspiring proposals for quantum information processing and computational schemes. Studies of spin dynamics in microcavities — a new and promising research field — have revealed novel effects such as polarization beats, stimulated spin scattering, and giant Faraday rotation. Here, we

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14

Holevo, A. S., and M. E. Shirokov. "Mutual and coherent information for infinite-dimensional quantum channels." Problems of Information Transmission 46, no. 3 (2010): 201–18. http://dx.doi.org/10.1134/s0032946010030014.

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15

Dey, Sanjib, Andreas Fring, and Véronique Hussin. "Nonclassicality versus entanglement in a noncommutative space." International Journal of Modern Physics B 31, no. 01 (2017): 1650248. http://dx.doi.org/10.1142/s0217979216502489.

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Nonclassicality is an interesting property of light having applications in many different contexts of quantum optics, quantum information and computation. Nonclassical states produce substantial amount of reduced noise in optical communications. Furthermore, they often behave as sources of entangled quantum states, which are the most elementary requirement for quantum teleportation. We study various nonclassical properties of coherent states and Schrödinger cat states in a setting of noncommutative space resulting from the generalized uncertainty relation, first, in a complete analytical fashi

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16

Lu, Z. G., J. R. Liu, Y. X. Mao, et al. "Quantum dot multi-wavelength lasers for Tbit/s coherent communications and 5G wireless networks -INVITED." EPJ Web of Conferences 238 (2020): 01003. http://dx.doi.org/10.1051/epjconf/202023801003.

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We will present the design, growth, fabrication, electronic control and packaging of the InAs/InP quantum dot (QD) multi-wavelength lasers (MWLs) developed by AEP of NRC in Canada. Their key technical specifications include L-I-V curves, optical and RF beating spectra, relative intensity noise (RIN), and optical phase noise of each individual wavelength channel, as well as timing jitter are investigated. Data bandwidth transmission capacity of 5.376 Tbit/s and 10.3 Tbit/s respectively in the PAM-4 and 16-QAM modulation formats are demonstrated by only using a single QD MWL chip. We have also d

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17

Morshnev, Sergey K., and A. V. Fantsesson. "Erratum: Coherent fiber-optic communications (review) [Sov. J. Quantum Electron. 15, 1183-1197 (September 1985)]." Soviet Journal of Quantum Electronics 15, no. 12 (1985): 1662. http://dx.doi.org/10.1070/qe1985v015n12abeh008103.

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18

Bonaldi, Michele, Antonio Borrielli, Giovanni Di Giuseppe, et al. "Low Noise Opto-Electro-Mechanical Modulator for RF-to-Optical Transduction in Quantum Communications." Entropy 25, no. 7 (2023): 1087. http://dx.doi.org/10.3390/e25071087.

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In this work, we present an Opto-Electro-Mechanical Modulator (OEMM) for RF-to-optical transduction realized via an ultra-coherent nanomembrane resonator capacitively coupled to an rf injection circuit made of a microfabricated read-out able to improve the electro-optomechanical interaction. This device configuration can be embedded in a Fabry–Perot cavity for electromagnetic cooling of the LC circuit in a dilution refrigerator exploiting the opto-electro-mechanical interaction. To this aim, an optically measured steady-state frequency shift of 380 Hz was seen with a polarization voltage of 30

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19

Wang, Michelle, Cooper Doyle, Bryn Bell, et al. "Topologically protected entangled photonic states." Nanophotonics 8, no. 8 (2019): 1327–35. http://dx.doi.org/10.1515/nanoph-2019-0058.

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AbstractEntangled multiphoton states lie at the heart of quantum information, computing, and communications. In recent years, topology has risen as a new avenue to robustly transport quantum states in the presence of fabrication defects, disorder, and other noise sources. Whereas topological protection of single photons and correlated photons has been recently demonstrated experimentally, the observation of topologically protected entangled states has thus far remained elusive. Here, we experimentally demonstrate the topological protection of spatially entangled biphoton states. We observe rob

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20

Gulbahar, Burhan. "Theory of Quantum Path Entanglement and Interference with Multiplane Diffraction of Classical Light Sources." Entropy 22, no. 2 (2020): 246. http://dx.doi.org/10.3390/e22020246.

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Quantum history states were recently formulated by extending the consistent histories approach of Griffiths to the entangled superposition of evolution paths and were then experimented with Greenberger–Horne–Zeilinger states. Tensor product structure of history-dependent correlations was also recently exploited as a quantum computing resource in simple linear optical setups performing multiplane diffraction (MPD) of fermionic and bosonic particles with remarkable promises. This significantly motivates the definition of quantum histories of MPD as entanglement resources with the inherent capabi

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21

Lib, Ohad, and Yaron Bromberg. "Thermal biphotons." APL Photonics 7, no. 3 (2022): 031301. http://dx.doi.org/10.1063/5.0085342.

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The observation of the Hanbury Brown and Twiss (HBT) effect with thermal light marked the birth of quantum optics. All the thermal sources considered to date did not feature quantum signatures of light, as they consisted of independent emitters that emit uncorrelated photons. Here, we propose and demonstrate an incoherent light source based on phase-randomized spatially entangled photons, which we coin thermal biphotons. We show that in contrast to thermal light, the width of the HBT peak for thermal biphotons is determined by their correlations, leading to violation of the Siegert relation an

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22

Abbas, A. H., and Ivan S. Maksymov. "Reservoir Computing Using Measurement-Controlled Quantum Dynamics." Electronics 13, no. 6 (2024): 1164. http://dx.doi.org/10.3390/electronics13061164.

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Physical reservoir computing (RC) is a machine learning algorithm that employs the dynamics of a physical system to forecast highly nonlinear and chaotic phenomena. In this paper, we introduce a quantum RC system that employs the dynamics of a probed atom in a cavity. The atom experiences coherent driving at a particular rate, leading to a measurement-controlled quantum evolution. The proposed quantum reservoir can make fast and reliable forecasts using a small number of artificial neurons compared with the traditional RC algorithm. We theoretically validate the operation of the reservoir, dem

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23

Hu, Guangchong, Rose L. Ahlefeldt, Gabriele G. de Boo, et al. "Single site optical spectroscopy of coupled Er³⁺ ion pairs in silicon." Quantum Science and Technology 7, no. 2 (2022): 025019. http://dx.doi.org/10.1088/2058-9565/ac56c7.

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Abstract Individual optical emitters coupled via coherent interactions are attractive qubits for quantum communications applications. Here, we present the first study of single pairs of interacting rare earth ions and determine the interactions between ions in the pair with high resolution. We identify two examples of Er3+ pair sites in Er implanted Si and characterise the interactions using optical Zeeman spectroscopy. We identify one pair as two Er3+ ions in sites of at least C 2 symmetry coupled via a large, 200 GHz, Ising-like spin interaction in both optical ground and excited states. The

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24

Kuang, Randy, and Adrian Chan. "Quantum encryption in phase space with displacement operators." EPJ Quantum Technology 10, no. 1 (2023). http://dx.doi.org/10.1140/epjqt/s40507-023-00183-0.

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AbstractIn photonic computing, the quantum systems consist of coherent states and squeezed coherent states. Common quantum gates found in these systems are: phase shift, displacement, and squeezing gates. These gates are all unitary and reversible. Outside of quantum systems, coherent states also plays a significant role in coherent optical communications with speeds of hundreds of gigabits per second. Secure optical communications is generally implemented at the data layer with classical symmetric encryption such as Advanced Standard Encryption or AES. This inevitably allows any wiretapping t

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25

Liu, Yulong, Qichun Liu, Huanying Sun, Mo Chen, Shuaipeng Wang, and Tiefu Li. "Coherent memory for microwave photons based on long-lived mechanical excitations." npj Quantum Information 9, no. 1 (2023). http://dx.doi.org/10.1038/s41534-023-00749-x.

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AbstractMechanical resonators, due to their capability to host ultralong-lived phonon modes, are particularly attractive for quantum state storage and as memory elements in conjunction with quantum computing and communication networks. Here we demonstrate absorptive-type coherent memory based on long-lived mechanical excitations. The itinerant coherent microwave field is captured, stored, and retrieved from a mechanical memory oscillator which is pre-cooled to the ground state. The phase space distribution allows us to distinguish between coherent and thermal components and study their evoluti

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26

DiMario, M. T., and F. E. Becerra. "Demonstration of optimal non-projective measurement of binary coherent states with photon counting." npj Quantum Information 8, no. 1 (2022). http://dx.doi.org/10.1038/s41534-022-00595-3.

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AbstractQuantum state discrimination is a central problem in quantum measurement theory, with applications spanning from quantum communication to computation. Typical measurement paradigms for state discrimination involve a minimum probability of error or unambiguous discrimination with a minimum probability of inconclusive results. Alternatively, an optimal inconclusive measurement, a non-projective measurement, achieves minimal error for a given inconclusive probability. This more general measurement encompasses the standard measurement paradigms for state discrimination and provides a much

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27

Opatrný, Tomáš, Šimon Bräuer, Abraham G. Kofman, et al. "Nonlinear coherent heat machines." Science Advances 9, no. 1 (2023). http://dx.doi.org/10.1126/sciadv.adf1070.

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We propose heat machines that are nonlinear, coherent, and closed systems composed of few field (oscillator) modes. Their thermal-state input is transformed by nonlinear Kerr interactions into nonthermal (non-Gaussian) output with controlled quantum fluctuations and the capacity to deliver work in a chosen mode. These machines can provide an output with strongly reduced phase and amplitude uncertainty that may be useful for sensing or communications in the quantum domain. They are experimentally realizable in optomechanical cavities where photonic and phononic modes are coupled by a Josephson

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28

Park, Kimin, Jacob Hastrup, Jonas Schou Neergaard-Nielsen, Jonatan Bohr Brask, Radim Filip, and Ulrik L. Andersen. "Slowing quantum decoherence of oscillators by hybrid processing." npj Quantum Information 8, no. 1 (2022). http://dx.doi.org/10.1038/s41534-022-00577-5.

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AbstractQuantum information encoded into the superposition of coherent states is an illustrative representation of practical applications of macroscopic quantum coherence possessing. However, these states are very sensitive to energy loss, losing their non-classical aspects of coherence very rapidly. An available deterministic strategy to slow down this decoherence process is to apply a Gaussian squeezing transformation prior to the loss as a protective step. Here, we propose a deterministic hybrid protection scheme utilizing strong but feasible interactions with two-level ancillas immune to s

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29

Clivati, Cecilia, Alice Meda, Simone Donadello, et al. "Coherent phase transfer for real-world twin-field quantum key distribution." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-021-27808-1.

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AbstractQuantum mechanics allows distribution of intrinsically secure encryption keys by optical means. Twin-field quantum key distribution is one of the most promising techniques for its implementation on long-distance fiber networks, but requires stabilizing the optical length of the communication channels between parties. In proof-of-principle experiments based on spooled fibers, this was achieved by interleaving the quantum communication with periodical stabilization frames. In this approach, longer duty cycles for the key streaming come at the cost of a looser control of channel length, a

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30

Forouzan, Amir R., and Mohammad Sheikhbahaei. "Shot Noise Optimal Receiver Filters for Coherent and Non‐Coherent Fibre Optic Communications." IET Communications 19, no. 1 (2025). https://doi.org/10.1049/cmu2.70026.

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ABSTRACTIn this paper, we investigate optimal receiver filter design with respect to shot noise in both non‐coherent and coherent fibre optic communication systems. We derive analytical expressions for the moment‐generating function of filter output and the signal‐to‐shot noise power ratio (SSNR) for intensity modulation direct detection (IM/DD) and phase diversity homodyne (PDH) optical fibre communication systems, with arbitrary waveform and receiver filter considerations in the presence of shot noise. Closed‐form formulas are provided for the receiver filter structures that maximise the SSN

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31

Nicolas, L., M. Businger, T. Sanchez Mejia, et al. "Coherent optical-microwave interface for manipulation of low-field electronic clock transitions in 171Yb3+:Y2SiO5." npj Quantum Information 9, no. 1 (2023). http://dx.doi.org/10.1038/s41534-023-00687-8.

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AbstractThe coherent interaction of solid-state spins with both optical and microwave fields provides a platform for a range of quantum technologies, such as quantum sensing, microwave-to-optical quantum transduction and optical quantum memories. Rare-earth ions with electronic spins are interesting in this context. In this work, we use a loop-gap microwave resonator to coherently drive optical and microwave clock transitions simultaneously in a 171Yb3+:Y2SiO5 crystal, achieving a Rabi frequency of 0.56 MHz at 2.497 GHz over a 1-cm long crystal. Furthermore, we provide insights into the spin d

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32

Hernández-Gómez, Santiago, Stefano Gherardini, Alessio Belenchia, Andrea Trombettoni, Mauro Paternostro, and Nicole Fabbri. "Experimental signature of initial quantum coherence on entropy production." npj Quantum Information 9, no. 1 (2023). http://dx.doi.org/10.1038/s41534-023-00738-0.

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AbstractWe report on the experimental quantification of the contribution to non-equilibrium entropy production stemming from the quantum coherence content in the initial state of a qubit exposed to both coherent driving and dissipation. Our experimental demonstration builds on the exquisite experimental control of the spin state of a nitrogen-vacancy defect in diamond and is underpinned, theoretically, by the formulation of a generalized fluctuation theorem designed to track the effects of quantum coherence. Our results provide significant evidence of the possibility to pinpoint the genuinely

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33

Sidhu, Jasminder S., Thomas Brougham, Duncan McArthur, Roberto G. Pousa, and Daniel K. L. Oi. "Finite key performance of satellite quantum key distribution under practical constraints." Communications Physics 6, no. 1 (2023). http://dx.doi.org/10.1038/s42005-023-01299-6.

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AbstractGlobal-scale quantum communication networks will require efficient long-distance distribution of quantum signals. While optical fibre communications are range-limited due to exponential losses in the absence of quantum memories and repeaters, satellites enable intercontinental quantum communications. However, the design of satellite quantum key distribution (SatQKD) systems has unique challenges over terrestrial networks. The typical approach to modelling SatQKD has been to estimate performances with a fully optimised protocol parameter space and with few payload and platform resource

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34

Kumar, Niraj, Eleni Diamanti, and Iordanis Kerenidis. "Efficient quantum communications with coherent state fingerprints over multiple channels." Physical Review A 95, no. 3 (2017). http://dx.doi.org/10.1103/physreva.95.032337.

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35

Harney, Cillian, and Stefano Pirandola. "End-to-end capacities of imperfect-repeater quantum networks." Quantum Science and Technology, June 23, 2022. http://dx.doi.org/10.1088/2058-9565/ac7ba0.

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Abstract The optimal performance of a communication network is limited not only by the quality of point-to-point channels but by the efficacy of its constituent technologies. Understanding the limits of quantum networks requires an understanding of both the ultimate capacities of quantum channels and the efficiency of imperfect quantum repeaters. In this work, using a recently developed node-splitting technique that introduces internal losses and noise into repeater devices, we present achievable end-to-end rates for noisy-repeater quantum networks. These are obtained by extending the coherent

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36

Wang, Chien-An, Corentin Déprez, Hanifa Tidjani, et al. "Probing resonating valence bonds on a programmable germanium quantum simulator." npj Quantum Information 9, no. 1 (2023). http://dx.doi.org/10.1038/s41534-023-00727-3.

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AbstractSimulations using highly tunable quantum systems may enable investigations of condensed matter systems beyond the capabilities of classical computers. Quantum dots and donors in semiconductor technology define a natural approach to implement quantum simulation. Several material platforms have been used to study interacting charge states, while gallium arsenide has also been used to investigate spin evolution. However, decoherence remains a key challenge in simulating coherent quantum dynamics. Here, we introduce quantum simulation using hole spins in germanium quantum dots. We demonstr

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37

Huang, Long, Weiqiang Wang, Fangxiang Wang, et al. "Massively parallel Hong-Ou-Mandel interference based on independent soliton microcombs." Science Advances 11, no. 5 (2025). https://doi.org/10.1126/sciadv.adq8982.

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Hong-Ou-Mandel (HOM) interference is the foundation of quantum optics to test the degree of indistinguishability of two incoming photons, playing a key role in quantum communication, sensing, and photonic quantum computing. Realizing high-visibility HOM interference with massively parallel optical channels is challenging due to the lack of available natural optical references for aligning independent arrayed laser pairs. Here, we demonstrate 50 parallel comb-teeth pairs of continuous-wave weak coherent photons HOM interference using two independently frequency post-aligned soliton microcombs (

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38

Wörner, Lisa, Kai Bongs, Stefanie Bremer, et al. "Quantum Network Infrastructure." Advanced Quantum Technologies, December 13, 2024. https://doi.org/10.1002/qute.202300415.

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AbstractGlobal quantum state distribution has applications in many areas, one of which is global key distribution for secure communications in an era of the threat of quantum computing. Long‐distance quantum key distribution requires a global network of optical relay stations, ground stations, and quantum memories. In this study, why quantum memories should be operated in space as untrusted nodes is presented. In addition to quantum key distribution, quantum memories in space are an enabling technology for distributed quantum sensor systems. The requirements for distributed sensors are outline

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39

Sun, Ming-Shuo, Chun-Hui Zhang, Yi-Zhen Luo, et al. "On-demand storing time-bin qubit states with optical quantum memory." Applied Physics Letters 126, no. 10 (2025). https://doi.org/10.1063/5.0255199.

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Quantum memory, serving as a crucial device for storing and releasing quantum states, holds significant importance in long-distance quantum communications. To date, quantum memories have been realized in many different systems. However, most of them have complex structures and high cost. Besides, it is not easy to simultaneously achieve both high storage efficiency and fidelity. In this paper, we experimentally demonstrate a low-cost optical quantum memory with high efficiency and high fidelity, by utilizing a butterfly-shaped cavity consisting of one polarization beam splitter, two reflecting

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40

Wang, Nan, Zhi-Bo Yang, Shi-Yan Li, Ting-Ting Dong, and Ai-Dong Zhu. "Parametric controllable one-way quantum steering induced by four-wave mixing in cavity magnonics." EPJ Quantum Technology 10, no. 1 (2023). http://dx.doi.org/10.1140/epjqt/s40507-023-00172-3.

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AbstractQuantum steering plays a crucial role in quantum communication and one-way quantum computation. Here, we study quantum steering between two magnon modes in a cavity-magnonics system by applying a two-photon drive field to the microwave cavity. The two magnon modes are entangled and the one-way steering can be implemented when the four-wave mixing is triggered. Different from most schemes that use the dissipation of the system to control quantum steering, in our scheme the one-way steering can be modulated on demand by adjusting the coherent coupling ratio between the two magnons and th

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41

Misra, Avijit, Pritam Chattopadhyay, Anatoly Svidzinsky, Marlan O. Scully, and Gershon Kurizki. "Black-hole powered quantum coherent amplifier." npj Quantum Information 10, no. 1 (2024). http://dx.doi.org/10.1038/s41534-024-00817-w.

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AbstractAtoms falling into a black hole (BH) through a cavity are shown to enable coherent amplification of light quanta powered by the BH-gravitational vacuum energy. This process can harness the BH energy towards useful purposes, such as propelling a spaceship trapped by the BH. The process can occur via transient amplification of a signal field by falling atoms that are partly excited by Hawking radiation reflected by an orbiting mirror. In the steady-state regime of thermally equilibrated atoms that weakly couple to the field, this amplifier constitutes a BH-powered quantum heat engine. Th

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42

Singh, Satvik, and Nilanjana Datta. "Detecting positive quantum capacities of quantum channels." npj Quantum Information 8, no. 1 (2022). http://dx.doi.org/10.1038/s41534-022-00550-2.

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AbstractDetermining whether a noisy quantum channel can be used to reliably transmit quantum information is a challenging problem in quantum information theory. This is because it requires computation of the channel’s coherent information for an unbounded number of copies of the channel. In this paper, we devise an elementary perturbative technique to solve this problem in a wide variety of circumstances. Our analysis reveals that a channel’s ability to transmit information is intimately connected to the relative sizes of its input, output, and environment spaces. We exploit this link to devel

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Zhou, Chao, Pinlei Lu, Matthieu Praquin, et al. "Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router." npj Quantum Information 9, no. 1 (2023). http://dx.doi.org/10.1038/s41534-023-00723-7.

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AbstractOne of the primary challenges in realizing large-scale quantum processors is the realization of qubit couplings that balance interaction strength, connectivity, and mode confinement. Moreover, it is very desirable for the device elements to be detachable, allowing components to be built, tested, and replaced independently. In this work, we present a microwave quantum state router, centered on parametrically driven, Josephson-junction based three-wave mixing, that realizes all-to-all couplings among four detachable quantum modules. We demonstrate coherent exchange among all four communi

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Rengaswamy, Narayanan, Kaushik P. Seshadreesan, Saikat Guha, and Henry D. Pfister. "Belief propagation with quantum messages for quantum-enhanced classical communications." npj Quantum Information 7, no. 1 (2021). http://dx.doi.org/10.1038/s41534-021-00422-1.

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AbstractFor space-based laser communications, when the mean photon number per received optical pulse is much smaller than one, there is a large gap between communications capacity achievable with a receiver that performs individual pulse-by-pulse detection, and the quantum-optimal “joint-detection receiver” that acts collectively on long codeword-blocks of modulated pulses; an effect often termed “superadditive capacity”. In this paper, we consider the simplest scenario where a large superadditive capacity is known: a pure-loss channel with a coherent-state binary phase-shift keyed (BPSK) modu

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Sidhu, Jasminder S., Thomas Brougham, Duncan McArthur, Roberto G. Pousa, and Daniel K. L. Oi. "Finite key effects in satellite quantum key distribution." npj Quantum Information 8, no. 1 (2022). http://dx.doi.org/10.1038/s41534-022-00525-3.

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AbstractGlobal quantum communications will enable long-distance secure data transfer, networked distributed quantum information processing, and other entanglement-enabled technologies. Satellite quantum communication overcomes optical fibre range limitations, with the first realisations of satellite quantum key distribution (SatQKD) being rapidly developed. However, limited transmission times between satellite and ground station severely constrains the amount of secret key due to finite-block size effects. Here, we analyse these effects and the implications for system design and operation, uti

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Zuo, Xiaoliang, Qingbin Li, Danyang Li, Haiteng Wu, Jiteng Sheng, and Haibin Wu. "Digital terahertz communication with Rydberg-atom-based coherent photon conversion." Applied Physics Letters 126, no. 19 (2025). https://doi.org/10.1063/5.0250550.

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We experimentally demonstrate digital communications in the terahertz (THz) band using a rubidium vapor cell as a quantum receiver. We utilize amplitude modulation to encode digital information in THz photons, which are coherently upconverted to optical photons via a Rydberg six-wave-mixing process. We achieve a data transmission rate of up to 1.16 Mbit/s and a tunable bandwidth of up to 142 MHz near a 0.11 THz carrier. With reduced data rate and increased integration time per bit, we demonstrate weak-field THz transmission with a receiver sensitivity in the −130 dBm range. As a proof of princ

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Wu, Yi-Hsien, Leon C. Camenzind, Akito Noiri, et al. "Hamiltonian phase error in resonantly driven CNOT gate above the fault-tolerant threshold." npj Quantum Information 10, no. 1 (2024). http://dx.doi.org/10.1038/s41534-023-00802-9.

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AbstractBecause of their long coherence time and compatibility with industrial foundry processes, electron spin qubits are a promising platform for scalable quantum processors. A full-fledged quantum computer will need quantum error correction, which requires high-fidelity quantum gates. Analyzing and mitigating gate errors are useful to improve gate fidelity. Here, we demonstrate a simple yet reliable calibration procedure for a high-fidelity controlled-rotation gate in an exchange-always-on Silicon quantum processor, allowing operation above the fault-tolerance threshold of quantum error cor

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Senica, Urban, Andres Forrer, Tudor Olariu, et al. "Planarized THz quantum cascade lasers for broadband coherent photonics." Light: Science & Applications 11, no. 1 (2022). http://dx.doi.org/10.1038/s41377-022-01058-2.

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AbstractRecently, there has been a growing interest in integrated THz photonics for various applications in communications, spectroscopy and sensing. We present a new integrated photonic platform based on active and passive elements integrated in a double-metal, high-confinement waveguide layout planarized with a low-loss polymer. An extended top metallization keeps waveguide losses low while improving dispersion, thermal and RF properties, as it enables to decouple the design of THz and microwave cavities. Free-running on-chip quantum cascade laser combs spanning 800 GHz, harmonic states with

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Arvizu-Mondragón, Arturo, Francisco J. Mendieta-Jiménez, César A. López-Mercado, and Ramón Muraoka-Espíritu. "Platonic constellations of quantum polarization coherent states in Stokes space for photonic communications." Optical and Quantum Electronics 57, no. 8 (2025). https://doi.org/10.1007/s11082-025-08346-2.

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Di Paolo, Agustin, Thomas E. Baker, Alexandre Foley, David Sénéchal, and Alexandre Blais. "Efficient modeling of superconducting quantum circuits with tensor networks." npj Quantum Information 7, no. 1 (2021). http://dx.doi.org/10.1038/s41534-020-00352-4.

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AbstractWe use a tensor network method to compute the low-energy excitations of a large-scale fluxonium qubit up to a desired accuracy. We employ this numerical technique to estimate the pure-dephasing coherence time of the fluxonium qubit due to charge noise and coherent quantum phase slips from first principles, finding an agreement with previously obtained experimental results. By developing an accurate single-mode theory that captures the details of the fluxonium device, we benchmark the results obtained with the tensor network for circuits spanning a Hilbert space as large as 15180. Our a

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