Journal articles: 'Optical quantum memory'

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Lvovsky, Alexander I., Barry C. Sanders, and Wolfgang Tittel. "Optical quantum memory." Nature Photonics 3, no. 12 (December 2009): 706–14. http://dx.doi.org/10.1038/nphoton.2009.231.

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DALL'ARNO, MICHELE, ALESSANDRO BISIO, and GIACOMO MAURO D'ARIANO. "IDEAL QUANTUM READING OF OPTICAL MEMORIES." International Journal of Quantum Information 10, no. 08 (December 2012): 1241010. http://dx.doi.org/10.1142/s0219749912410109.

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Quantum reading is the art of exploiting the quantum properties of light to retrieve classical information stored in an optical memory with low energy and high accuracy. Focusing on the ideal scenario where noise and loss are negligible, we review previous works on the optimal strategies for minimal-error retrieving of information (ambiguous quantum reading) and perfect but probabilistic retrieving of information (unambiguous quantum reading). The optimal strategies largely overcome the optimal coherent protocols (reminiscent of common CD readers), further allowing for perfect discrimination. Experimental proposals for optical implementations of optimal quantum reading are provided.

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Akat’ev, D. O., and A. A. Kalachev. "Optical parametric oscillator with quantum memory for quantum repeaters." Laser Physics 33, no. 1 (December 8, 2022): 015202. http://dx.doi.org/10.1088/1555-6611/aca6dc.

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Abstract We consider preparing entangled states between single photons and quantum memory by combining two-photon source based on spontaneous parametric down-conversion and multiatomic quantum memory in a common resonator. The scheme allows one to minimize the losses while the photon to be stored is propagating from the source to the quantum memory and avoids the need to synchronize their operating wavelength. In this respect, the scheme is analogous to the cavity-enhanced embedded memory within Duan-Lukin-Cirac-Zoller approach, but it remains possible to generate a second photon at the wavelength of the fiber optic communication channel and use various multiplexing methods inherent in multiatomic quantum memory.

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Xing, Xue-Yan, Xia-Xia Li, Yu-Hui Chen, and Xiang-Dong Zhang. "Optical Echo memory based on photonic crystal cavities." Acta Physica Sinica 71, no. 11 (2022): 1. http://dx.doi.org/10.7498/aps.70.20220083.

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Analogous to Internet, connecting quantum computers together to build a full quantum network will boost the processing capability for quantum information. On-chip quantum memories can carry out essential functionalities in building a quantum network, including synchronizing of a large number of quantum computers and implementing long-distance quantum communication. However, mainly owning to the constraints imposed by the micro-photonic structures themselves, on-chip quantum memories are hinder by a trade-off between their performance and integration. We here propose using spatial-phase-mismatching effect in photonic crystal cavities to build an on-chip quantum memory. This scenario does not only utilize the large orbital angular momentum of photonic crystal cavities to realize photon-echo type memory, but also utilize the light-matter enhancement of a photonic cavity to achieve a high-efficiency quantum storage.

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Amiri, I. S., and J. Ali. "Femtosecond Optical Quantum Memory Generation Using Optical Bright Soliton." Journal of Computational and Theoretical Nanoscience 11, no. 6 (June 1, 2014): 1480–85. http://dx.doi.org/10.1166/jctn.2014.3521.

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Adler, Thomas, Manuel Erhard, Mario Krenn, Johannes Brandstetter, Johannes Kofler, and Sepp Hochreiter. "Quantum Optical Experiments Modeled by Long Short-Term Memory." Photonics 8, no. 12 (November 26, 2021): 535. http://dx.doi.org/10.3390/photonics8120535.

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We demonstrate how machine learning is able to model experiments in quantum physics. Quantum entanglement is a cornerstone for upcoming quantum technologies, such as quantum computation and quantum cryptography. Of particular interest are complex quantum states with more than two particles and a large number of entangled quantum levels. Given such a multiparticle high-dimensional quantum state, it is usually impossible to reconstruct an experimental setup that produces it. To search for interesting experiments, one thus has to randomly create millions of setups on a computer and calculate the respective output states. In this work, we show that machine learning models can provide significant improvement over random search. We demonstrate that a long short-term memory (LSTM) neural network can successfully learn to model quantum experiments by correctly predicting output state characteristics for given setups without the necessity of computing the states themselves. This approach not only allows for faster search, but is also an essential step towards the automated design of multiparticle high-dimensional quantum experiments using generative machine learning models.

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Bantysh, B. I., K. G. Katamadze, Yu I. Bogdanov, K. I. Gerasimov, M. M. Minnegaliev, R. V. Urmancheev, and S. A. Moiseev. "Tomography of Optical Single-Qubit Quantum Memory." JETP Letters 116, no. 1 (July 2022): 29–35. http://dx.doi.org/10.1134/s0021364022600951.

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Kalachev, A. A., and V. V. Samartsev. "Quantum memory and quantum computations in the optical subradiance regime." Quantum Electronics 35, no. 8 (August 31, 2005): 679–82. http://dx.doi.org/10.1070/qe2005v035n08abeh010261.

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Li, Zheng-Da, Rui Zhang, Xu-Fei Yin, Li-Zheng Liu, Yi Hu, Yu-Qiang Fang, Yue-Yang Fei, et al. "Experimental quantum repeater without quantum memory." Nature Photonics 13, no. 9 (June 24, 2019): 644–48. http://dx.doi.org/10.1038/s41566-019-0468-5.

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Li, Jin-Jin, and Ka-Di Zhu. "Quantum memory for light with a quantum dot system coupled to a nanomechanical resonator." Quantum Information and Computation 11, no. 5&6 (May 2011): 456–65. http://dx.doi.org/10.26421/qic11.5-6-7.

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The specific features including high factor and long vibration lifetime of nanomechanical resonator (NR) in nano-optomechanical systems have stimulated research to realize some optical devices. In this work, we demonstrate theoretically that it is possible to achieve quantum memory for light on demand via a quantum dot system coupled to a nanomechanical resonator. This quantum memory for light is based on mechanically induced exciton polaritons, which makes the dark-state polariton reaccelerated and converted back into a photon pulse. Our presented device could open the door to all-optical routers for light memory devices and quantum information processing.

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Zhong, Tian, Jonathan M. Kindem, John G. Bartholomew, Jake Rochman, Ioana Craiciu, Evan Miyazono, Marco Bettinelli, et al. "Nanophotonic rare-earth quantum memory with optically controlled retrieval." Science 357, no. 6358 (August 31, 2017): 1392–95. http://dx.doi.org/10.1126/science.aan5959.

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Optical quantum memories are essential elements in quantum networks for long-distance distribution of quantum entanglement. Scalable development of quantum network nodes requires on-chip qubit storage functionality with control of the readout time. We demonstrate a high-fidelity nanophotonic quantum memory based on a mesoscopic neodymium ensemble coupled to a photonic crystal cavity. The nanocavity enables >95% spin polarization for efficient initialization of the atomic frequency comb memory and time bin–selective readout through an enhanced optical Stark shift of the comb frequencies. Our solid-state memory is integrable with other chip-scale photon source and detector devices for multiplexed quantum and classical information processing at the network nodes.

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Gonzalez-Raya, Tasio, Joseph M. Lukens, Lucas C. Céleri, and Mikel Sanz. "Quantum Memristors in Frequency-Entangled Optical Fields." Materials 13, no. 4 (February 14, 2020): 864. http://dx.doi.org/10.3390/ma13040864.

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A quantum memristor is a passive resistive circuit element with memory, engineered in a given quantum platform. It can be represented by a quantum system coupled to a dissipative environment, in which a system–bath coupling is mediated through a weak measurement scheme and classical feedback on the system. In quantum photonics, such a device can be designed from a beam splitter with tunable reflectivity, which is modified depending on the results of measurements in one of the outgoing beams. Here, we show that a similar implementation can be achieved with frequency-entangled optical fields and a frequency mixer that, working similarly to a beam splitter, produces state superpositions. We show that the characteristic hysteretic behavior of memristors can be reproduced when analyzing the response of the system with respect to the control, for different experimentally attainable states. Since memory effects in memristors can be exploited for classical and neuromorphic computation, the results presented in this work could be a building block for constructing quantum neural networks in quantum photonics, when scaling up.

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Varnava, Michael, Daniel E. Browne, and Terry Rudolph. "Loss tolerant linear optical quantum memory by measurement-based quantum computing." New Journal of Physics 9, no. 6 (June 29, 2007): 203. http://dx.doi.org/10.1088/1367-2630/9/6/203.

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Ma, Lijun, Oliver Slattery, and Xiao Tang. "Optical quantum memory based on electromagnetically induced transparency." Journal of Optics 19, no. 4 (February 20, 2017): 043001. http://dx.doi.org/10.1088/2040-8986/19/4/043001.

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Nurdin, Hendra I., and John E. Gough. "Modular quantum memories using passive linear optics and coherent feedback." Quantum Information and Computation 15, no. 11&12 (September 2015): 1017–40. http://dx.doi.org/10.26421/qic15.11-12-9.

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In this paper, we show that quantum memory for qudit states encoded in a single photon pulsed optical field has a conceptually simple modular realization using only passive linear optics and coherent feedback. We exploit the idea that two decaying optical cavities can be coupled in a coherent feedback configuration to create an internal mode of the coupled system which is isolated and decoherence-free for the purpose of qubit storage. The qubit memory can then be switched between writing/read-out mode and storage mode simply by varying the routing of certain freely propagating optical fields in the network. It is then shown that the qubit memories can be interconnected with one another to form a qudit quantum memory. We explain each of the phase of writing, storage, and read-out for this modular quantum memory scheme. The results point a way towards modular architectures for complex compound quantum memories.

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Zhou, Pai, Xia-Xia Li, Xue-Yan Xing, Yu-Hui Chen, and Xiang-Dong Zhang. "Quantum memory and manipulation based on erbium doped crystals." Acta Physica Sinica 71, no. 6 (2022): 064203. http://dx.doi.org/10.7498/aps.71.20211803.

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Quantum information is a rapidly emerging field aiming at combining two of the greatest advances in science and technology of the twentieth century, that is, quantum mechanics and information science. To reliably generate, store, process, and transmit quantum information, diverse systems have been studied. While for specific tasks some of these systems are more suitable than others, no single system can meet all envisioned demands. Erbium doped crystal has optical transition at 1.5 μm and possesses long optical coherence time and spin coherence time, and thus is one of the best candidates in building several essential blocks for quantum information applications. In this review, we summarize the applications of erbium doped crystals in quantum memories, quantum transducers, quantum sources, and quantum manipulations based on erbium-erbium interactions. Finally, the outlooks for near term prospects of the mentioned topics are also given.

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Dall'Arno, Michele. "Quantum reading for the practical man." International Journal of Quantum Information 12, no. 07n08 (November 2014): 1560018. http://dx.doi.org/10.1142/s0219749915600187.

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Quantum reading is the art of exploiting the quantum properties of light to retrieve classical information stored in an optical memory with low energy and high accuracy. It was shown that the optimal strategy for quantum reading of beamsplitters largely outperforms coherent strategies, further allowing for perfect quantum reading, but requires a source challenging from the experimental viewpoint. Focusing on probes — i.e. BAT states and entangled coherent states (ECS) — which are experimentally feasible with present quantum optical technology, but still allow for perfect quantum reading, we evaluate the tradeoffs between the energy and the probability of error (failure) in ambiguous (unambiguous) quantum reading. It turns out that BAT states outperform ECS in any regime except for the case of high-energy discrimination of two beamsplitters with similar reflectivities.

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Cho, Y. W., G. T. Campbell, J. L. Everett, J. Bernu, D. B. Higginbottom, M. T. Cao, J. Geng, N. P. Robins, P. K. Lam, and B. C. Buchler. "Highly efficient optical quantum memory with long coherence time in cold atoms." Optica 3, no. 1 (January 15, 2016): 100. http://dx.doi.org/10.1364/optica.3.000100.

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Wei, Xiong, and Guo Min. "A New Nano-Design of a Fault-Tolerant Coplanar RAM with Set/Reset Ability Based on Quantum-Dots." ECS Journal of Solid State Science and Technology 11, no. 4 (April 1, 2022): 041002. http://dx.doi.org/10.1149/2162-8777/ac611c.

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Quantum Dot Cellular Automata (QCA) is a recent technology that has piqued researchers’ interest because of its small size and low energy consumption. With the help of quantum dots, the QCA technology delivers a new computational foundation for constructing digital circuits. Medical imaging and quantum computing are just a few applications for quantum dots. Quantum dots are nanocrystals that transmit data at the nano-scale. Since the memory is an important digital circuit, this work proposes a fault-tolerant loop-based coplanar Random Access Memory (RAM) with set/reset capability that uses the QCA rules. The memory cell’s operation is verified both physically and through simulations with the QCADesigner program. The quantum cost of the proposed memory cell shows that it has a negligible quantum cost. The proposed QCA-based memory circuit performs well in simulations, with 96 QCA cells and the output signal generated after 0.75 clock phases. The gates and wire in this design have around 85 percent better fault-tolerant capability than the best-presented memory systems. Furthermore, this circuit can tolerate most cell omission, displacement, misalignment, and deposition faults. This structure can be used to create high-performance higher-order fault-tolerant memory structures.

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GAO Wei, 高微, 王明锋 WANG Ming-feng, and 郑亦庄 ZHENG Yi-zhuang. "Quantum Memory with CRIB in an Asymmetric Optical Cavity." ACTA PHOTONICA SINICA 42, no. 6 (2013): 727–31. http://dx.doi.org/10.3788/gzxb20134206.0727.

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Wu, Miao-Xin, Ming-Feng Wang, and Yi-Zhuang Zheng. "Photon-echo-based quantum memory for optical squeezed states." Journal of Physics B: Atomic, Molecular and Optical Physics 48, no. 15 (June 26, 2015): 155501. http://dx.doi.org/10.1088/0953-4075/48/15/155501.

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Thekkadath, G. S., K. Heshami, D. G. England, P. J. Bustard, B. J. Sussman, and M. Spanner. "Optical quantum memory for ultrafast photons using molecular alignment." Journal of Modern Optics 63, no. 20 (May 10, 2016): 2093–100. http://dx.doi.org/10.1080/09500340.2016.1181218.

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McAuslan, D. L., L. R. Taylor, and J. J. Longdell. "Using quantum memory techniques for optical detection of ultrasound." Applied Physics Letters 101, no. 19 (November 5, 2012): 191112. http://dx.doi.org/10.1063/1.4766341.

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Cong, Kankan, Weiwei Jiang, Bryan E. Anthonio, G. Timothy Noe, Huaping Liu, Hiromichi Kataura, Mackillo Kira, and Junichiro Kono. "Quantum-Memory-Enabled Ultrafast Optical Switching in Carbon Nanotubes." ACS Photonics 7, no. 6 (May 6, 2020): 1382–87. http://dx.doi.org/10.1021/acsphotonics.0c00315.

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Nihei, Hiroyuki, and Atsushi Okamoto. "Quantum-information detection from optical memory using photonic crystals." Electronics and Communications in Japan (Part II: Electronics) 87, no. 8 (2004): 10–19. http://dx.doi.org/10.1002/ecjb.10205.

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Minnegaliev, Mansur, Konstantin Gerasimov, Ravil Urmancheev, and Sergey Moiseev. "Experimental realization of revival of silenced echo memory protocol in optical cavity." EPJ Web of Conferences 190 (2018): 03007. http://dx.doi.org/10.1051/epjconf/201819003007.

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We demonstrated a photon echo quantum memory for weak input optical pulses on the ROSE protocol in a Tm3+:Y3Al5O12 crystal placed in impedance-matched optical cavity. The quantum efficiency of 21% for a storage of time of 36 µs was achieved for single light pulses.

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Beck, Kristin M., Mahdi Hosseini, Yiheng Duan, and Vladan Vuletić. "Large conditional single-photon cross-phase modulation." Proceedings of the National Academy of Sciences 113, no. 35 (August 12, 2016): 9740–44. http://dx.doi.org/10.1073/pnas.1524117113.

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Deterministic optical quantum logic requires a nonlinear quantum process that alters the phase of a quantum optical state by π through interaction with only one photon. Here, we demonstrate a large conditional cross-phase modulation between a signal field, stored inside an atomic quantum memory, and a control photon that traverses a high-finesse optical cavity containing the atomic memory. This approach avoids fundamental limitations associated with multimode effects for traveling optical photons. We measure a conditional cross-phase shift of π/6 (and up to π/3 by postselection on photons that remain in the system longer than average) between the retrieved signal and control photons, and confirm deterministic entanglement between the signal and control modes by extracting a positive concurrence. By upgrading to a state-of-the-art cavity, our system can reach a coherent phase shift of π at low loss, enabling deterministic and universal photonic quantum logic.

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Pang, Xiao-Ling, Ai-Lin Yang, Jian-Peng Dou, Hang Li, Chao-Ni Zhang, Eilon Poem, Dylan J. Saunders, et al. "A hybrid quantum memory–enabled network at room temperature." Science Advances 6, no. 6 (February 2020): eaax1425. http://dx.doi.org/10.1126/sciadv.aax1425.

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Quantum memory capable of storage and retrieval of flying photons on demand is crucial for developing quantum information technologies. However, the devices needed for long-distance links are different from those envisioned for local processing. We present the first hybrid quantum memory-enabled network by demonstrating the interconnection and simultaneous operation of two types of quantum memory: an atomic ensemble-based memory and an all-optical Loop memory. Interfacing the quantum memories at room temperature, we observe a well-preserved quantum correlation and a violation of Cauchy-Schwarz inequality. Furthermore, we demonstrate the creation and storage of a fully-operable heralded photon chain state that can achieve memory-built-in combining, swapping, splitting, tuning, and chopping single photons in a chain temporally. Such a quantum network allows atomic excitations to be generated, stored, and converted to broadband photons, which are then transferred to the next node, stored, and faithfully retrieved, all at high speed and in a programmable fashion.

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Varró, Sándor. "Quantum Optical Aspects of High-Harmonic Generation." Photonics 8, no. 7 (July 9, 2021): 269. http://dx.doi.org/10.3390/photonics8070269.

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The interaction of electrons with strong laser fields is usually treated with semiclassical theory, where the laser is represented by an external field. There are analytic solutions for the free electron wave functions, which incorporate the interaction with the laser field exactly, but the joint effect of the atomic binding potential presents an obstacle for the analysis. Moreover, the radiation is a dynamical system, the number of photons changes during the interactions. Thus, it is legitimate to ask how can one treat the high order processes nonperturbatively, in such a way that the electron-atom interaction and the quantized nature of radiation be simultaneously taken into account? An analytic method is proposed to answer this question in the framework of nonrelativistic quantum electrodynamics. As an application, a quantum optical generalization of the strong-field Kramers-Heisenberg formula is derived for describing high-harmonic generation. Our formalism is suitable to analyse, among various quantal effects, the possible role of arbitrary photon statistics of the incoming field. The present paper is dedicated to the memory of Prof. Dr. Fritz Ehlotzky, who had significantly contributed to the theory of strong-field phenomena over many decades.

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Chen, Yao, Fangxing Zhang, Tian Qin, Guolin Zhao, Jiankun Hou, Xianfeng Chen, Li Ge, and Wenjie Wan. "Exceptional points with memory in a microcavity Brillouin laser." Optica 9, no. 9 (August 23, 2022): 971. http://dx.doi.org/10.1364/optica.456977.

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Exceptional points (EPs), universally present in non-Hermitian systems, often reveal some critical behaviors such as topological encircling chirality and ultrahigh enhanced sensing near such singularities. However, most of the experimental realizations of EPs have been limited to the linear regime, where system nonlinearity has been omitted. Here, we experimentally observe two distinct EPs with opposite hermiticities and demonstrate a parity–time phase transition with exotic memory effects near the EPs in a nonlinear and non-Hermitian system based on a stimulated Brillouin laser in an optical microcavity. The self-phase modulation induced nonlinearity effectively alters the EP location, surprisingly, in an asymmetric manner, resulting in a bistable memory effect. Moreover, two EPs with opposite hermiticities in the same system are found to show quite distinct behaviors in such a memory effect. This scheme completes the studies of non-Hermitian physics in a more general scenario by including nonlinearity and paves the way toward optical memory for all-optical signal processing and quantum information.

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Lupo, Cosmo, and Stefano Pirandola. "Super-additivity and entanglement assistance in quantum reading." Quantum Information and Computation 17, no. 7&8 (May 2017): 611–22. http://dx.doi.org/10.26421/qic17.7-8-4.

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Quantum information theory determines the maximum rates at which information can be transmitted through physical systems described by quantum mechanics. Here we consider the communication protocol known as quantum reading. Quantum reading is a protocol for retrieving the information stored in a digital memory by using a quantum probe, e.g., shining quantum states of light to read an optical memory. In a variety of situations using a quantum probe enhances the performance of the reading protocol in terms of fidelity, data density and energy efficiency. Here we review and characterize the quantum reading capacity of a memory model, defined as the maximum rate of reliable reading. We show that, like other quantities in quantum information theory, the quantum reading capacity is super-additive. Moreover, we determine conditions under which the use of an entangled ancilla improves the performance of quantum reading.

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Gangloff, D. A., G. Éthier-Majcher, C. Lang, E. V. Denning, J. H. Bodey, D. M. Jackson, E. Clarke, M. Hugues, C. Le Gall, and M. Atatüre. "Quantum interface of an electron and a nuclear ensemble." Science 364, no. 6435 (February 21, 2019): 62–66. http://dx.doi.org/10.1126/science.aaw2906.

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Coherent excitation of an ensemble of quantum objects underpins quantum many-body phenomena and offers the opportunity to realize a memory that stores quantum information. Thus far, a deterministic and coherent interface between a spin qubit and such an ensemble has remained elusive. In this study, we first used an electron to cool the mesoscopic nuclear spin ensemble of a semiconductor quantum dot to the nuclear sideband–resolved regime. We then implemented an all-optical approach to access individual quantized electronic-nuclear spin transitions. Lastly, we performed coherent optical rotations of a single collective nuclear spin excitation—a spin wave. These results constitute the building blocks of a dedicated local memory per quantum-dot spin qubit and promise a solid-state platform for quantum-state engineering of isolated many-body systems.

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MEI, FENG, YA-FEI YU, and ZHI-MING ZHANG. "DECOHERENCE-FREE QUANTUM MEMORY FOR PHOTONIC STATE USING ATOMIC ENSEMBLES." International Journal of Quantum Information 07, no. 04 (June 2009): 811–20. http://dx.doi.org/10.1142/s021974990900547x.

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Large scale quantum information processing requires stable and long-lived quantum memories. Here, using atom-photon entanglement, we propose an experimentally feasible scheme to realize decoherence-free quantum memory with atomic ensembles, and show one of its applications, remote transfer of unknown quantum state, based on laser manipulation of atomic ensembles, photonic state operation through optical elements, and single-photon detection with moderate efficiency. The scheme, with inherent fault-tolerance to the practical noise and imperfections, allows one to retrieve the information in the memory for further quantum information processing within the reach of current technology.

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Haug, Hartmut. "Quantum Coherence in Ultrafast Semiconductor Spectroscopy." Journal of Nonlinear Optical Physics & Materials 07, no. 02 (June 1998): 227–39. http://dx.doi.org/10.1142/s0218863598000193.

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Coherent optical phenomena such as the optical Stark effect, Rabi flopping, photon echo and quantum beating which are well-known in atomic spectroscopy can also be observed in semiconductors by using femtosecond laser pulses. On these short time scales, the quantum coherence of the optical excitations in the solid do not only influence the optical properties but change at the same time the relaxation and dephasing kinetics. The quasi-classical Boltzmann kinetics has to be replaced by quantum kinetics. Coherence leads to the appearance of memory in the scattering integrals. For femtosecond four-wave mixing and pump-and-probe spectroscopy the use of quantum kinetics for LO-phonon and for carrier-carrier scattering will be reviewed.

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Vasilyev, D. V., I. V. Sokolov, and E. S. Polzik. "Quantum memory for images with feedback." Optics and Spectroscopy 106, no. 6 (June 2009): 875–80. http://dx.doi.org/10.1134/s0030400x09060149.

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ZHU Qing-yu, 朱晴羽, 刘刚 LIU Gang, 吴妙鑫 WU Miao-xin, and 郑亦庄 ZHENG Yi-zhuang. "Quantum Memory for Optical Coherent State Based on Photon Echo." Acta Sinica Quantum Optica 23, no. 2 (2017): 136–43. http://dx.doi.org/10.3788/jqo20172302.0006.

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Moiseev, S. A., and W. Tittel. "Optical quantum memory with generalized time-reversible atom–light interaction." New Journal of Physics 13, no. 6 (June 17, 2011): 063035. http://dx.doi.org/10.1088/1367-2630/13/6/063035.

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Tsukanov, A. V. "Quantum memory on a charge qubit in an optical microresonator." Optics and Spectroscopy 123, no. 4 (October 2017): 602–9. http://dx.doi.org/10.1134/s0030400x17100241.

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Imamura, Kenichi, Yoshihiro Sugiyama, Yoshiaki Nakata, Shunichi Muto, and NaokiYokoyama. "New Optical Memory Structure Using Self-Assembled InAs Quantum Dots." Japanese Journal of Applied Physics 34, Part 2, No. 11A (November 1, 1995): L1445—L1447. http://dx.doi.org/10.1143/jjap.34.l1445.

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Gao, Wei, Xiao-Dong Tan, Ming-Feng Wang, and Yi-Zhuang Zheng. "Quantum Memory with Natural Inhomogeneous Broadening in an Optical Cavity." International Journal of Theoretical Physics 52, no. 6 (February 26, 2013): 2092–98. http://dx.doi.org/10.1007/s10773-013-1503-9.

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Ortolano, Giuseppe, and Ivano Ruo-Berchera. "Quantum Readout of Imperfect Classical Data." Sensors 22, no. 6 (March 15, 2022): 2266. http://dx.doi.org/10.3390/s22062266.

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The encoding of classical data in a physical support can be done up to some level of accuracy due to errors and the imperfection of the writing process. Moreover, some degradation of the stored data can happen over time because of physical or chemical instability of the system. Any readout strategy should take into account this natural degree of uncertainty and minimize its effect. An example are optical digital memories, where the information is encoded in two values of reflectance of a collection of cells. Quantum reading using entanglement, has been shown to enhances the readout of an ideal optical memory, where the two level are perfectly characterized. In this work, we analyse the case of imperfect construction of the memory and propose an optimized quantum sensing protocol to maximize the readout accuracy in presence of imprecise writing. The proposed strategy is feasible with current technology and is relatively robust to detection and optical losses. Beside optical memories, this work have implications for identification of pattern in biological system, in spectrophotometry, and whenever the information can be extracted from a transmission/reflection optical measurement.

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Stas, P. J., Y. Q. Huan, B. Machielse, E. N. Knall, A. Suleymanzade, B. Pingault, M. Sutula, et al. "Robust multi-qubit quantum network node with integrated error detection." Science 378, no. 6619 (November 4, 2022): 557–60. http://dx.doi.org/10.1126/science.add9771.

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Long-distance quantum communication and networking require quantum memory nodes with efficient optical interfaces and long memory times. We report the realization of an integrated two-qubit network node based on silicon-vacancy centers (SiVs) in diamond nanophotonic cavities. Our qubit register consists of the SiV electron spin acting as a communication qubit and the strongly coupled silicon-29 nuclear spin acting as a memory qubit with a quantum memory time exceeding 2 seconds. By using a highly strained SiV, we realize electron-photon entangling gates at temperatures up to 1.5 kelvin and nucleus-photon entangling gates up to 4.3 kelvin. We also demonstrate efficient error detection in nuclear spin–photon gates by using the electron spin as a flag qubit, making this platform a promising candidate for scalable quantum repeaters.

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Blok, M. S., N. Kalb, A. Reiserer, T. H. Taminiau, and R. Hanson. "Towards quantum networks of single spins: analysis of a quantum memory with an optical interface in diamond." Faraday Discussions 184 (2015): 173–82. http://dx.doi.org/10.1039/c5fd00113g.

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Single defect centers in diamond have emerged as a powerful platform for quantum optics experiments and quantum information processing tasks. Connecting spatially separated nodes via optical photons into a quantum network will enable distributed quantum computing and long-range quantum communication. Initial experiments on trapped atoms and ions as well as defects in diamond have demonstrated entanglement between two nodes over several meters. To realize multi-node networks, additional quantum bit systems that store quantum states while new entanglement links are established are highly desirable. Such memories allow for entanglement distillation, purification and quantum repeater protocols that extend the size, speed and distance of the network. However, to be effective, the memory must be robust against the entanglement generation protocol, which typically must be repeated many times. Here we evaluate the prospects of using carbon nuclear spins in diamond as quantum memories that are compatible with quantum networks based on single nitrogen vacancy (NV) defects in diamond. We present a theoretical framework to describe the dephasing of the nuclear spins under repeated generation of NV spin-photon entanglement and show that quantum states can be stored during hundreds of repetitions using typical experimental coupling parameters. This result demonstrates that nuclear spins with weak hyperfine couplings are promising quantum memories for quantum networks.

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Li, Shujing, Jiaxin Bao, Qiqi Deng, Lirong Chen, and Hai Wang. "Frequency Conversion Interface towards Quantum Network: From Atomic Transition Line to Fiber Optical Communication Band." Applied Sciences 12, no. 13 (June 27, 2022): 6522. http://dx.doi.org/10.3390/app12136522.

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Quantum repeater is a key component of quantum network, and atomic memory is one of the important candidates for constructing quantum repeater. However, the atomic transition wavelength is not suitable for long-distance transmission in optical fiber. To bridge atomic memory and fiber communication, we demonstrate a frequency conversion interface from rubidium D1 line (795 nm) to the optical communication L-band (1621 nm) based on difference frequency generation. To reduce broadband noise of spontaneous Raman scattering caused by strong pumping light, we use a combination of two cascaded etalons and a Fabry-Perot cavity with low finesse to narrow the noise bandwidth to 11.7 MHz. The filtering system is built by common optical elements and is easy to use; it can be widely applied in frequency conversion process. We show that the signal-noise ratio of the converted field is good enough to reduce the input photon number below 1 under the condition of low external device conversion efficiency (0.51%) and large duration of input pulse (250 ns). The demonstrated frequency conversion interface has important potential application in quantum networks.

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Yu, Zhifei, Bo Fang, Liqing Chen, Keye Zhang, Chun-Hua Yuan, and Weiping Zhang. "Memory-assisted quantum accelerometer with multi-bandwidth." Photonics Research 10, no. 4 (March 25, 2022): 1022. http://dx.doi.org/10.1364/prj.453940.

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Perminov, N. S., D. Yu Tarankova, and S. A. Moiseev. "Spectrally Improved Controllable Frequency Comb Quantum Memory." Optics and Spectroscopy 127, no. 2 (August 2019): 335–39. http://dx.doi.org/10.1134/s0030400x19080204.

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Viscor, D., A. Ferraro, Yu Loiko, R. Corbalán, J. Mompart, and V. Ahufinger. "Optical quantum memory for polarization qubits withV-type three-level atoms." Journal of Physics B: Atomic, Molecular and Optical Physics 44, no. 19 (September 13, 2011): 195504. http://dx.doi.org/10.1088/0953-4075/44/19/195504.

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Antón, M. A., and F. Carreño. "Quantum memory and all-optical switching in positive charged quantum dots via Zeeman coherent oscillations." Journal of Optics 12, no. 10 (September 24, 2010): 104006. http://dx.doi.org/10.1088/2040-8978/12/10/104006.

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Dimitrakis, P., P. Normand, V. Ioannou-Sougleridis, C. Bonafos, S. Schamm-Chardon, G. BenAssayag, and E. Iliopoulos. "Quantum dots for memory applications." physica status solidi (a) 210, no. 8 (July 8, 2013): 1490–504. http://dx.doi.org/10.1002/pssa.201300029.

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VEISSIER, L., A. NICOLAS, L. GINER, D. MAXEIN, A. S. SHEREMET, M. SCHERMAN, S. BURKS, J. LAURAT, and E. GIACOBINO. "TOWARDS A MULTIMODE QUANTUM MEMORY FOR SINGLE PHOTONS." International Journal of Quantum Information 10, no. 08 (December 2012): 1241011. http://dx.doi.org/10.1142/s0219749912410110.

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In this paper, an optical memory based on an ensemble of cold Cesium atoms interacting with light in the electromagnetically induced transparency (EIT) regime is studied in view of spatially multimode quantum storage. The interfacing protocol involves a control field, generating EIT for the very weak field that carries the quantum signal to be stored and enabling its mapping into the collective hyperfine coherence of the cold atomic ensemble. For the demonstration of multimode storage, the signal pulse at the single photon level is prepared in a mode with (OAM), while the control field is in a TEM00 mode. After the writing process, the information is kept in the memory register. In the retrieval phase, the information is read back from atoms to light and we show that these pulses at the single photon level with OAM can be stored and retrieved with a preserved spatial phase and a good efficiency.

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Journal articles on the topic 'Optical quantum memory'

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