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Journal articles on the topic 'Squeezed vacuum state'

Author: Grafiati

Published: 4 June 2025

Last updated: 23 June 2025

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1

Alemayehu, Getahun. "Squeezing and Statistical properties of Single mode Displaced Squeezed Vacuum State." J. of Physical and Chemical Sciences 7, no. 3 (2020): 02. https://doi.org/10.5281/zenodo.3751254.

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In this paper the displaced squeezed vacuum state is produced by application of displaced operator on squeezed vacuum state. With help of density operator we find Q function, with the Q function mean, variance and quadrature variance would be calculated. From this we can determine the system has superpoissonian statics, the squeezed parameter is direct proportion with both mean and variance of photon number, but inversely proportion with quadrature variance. The squeezing occurs in plus quadrature with the maximum squeezing of 99.7% for r=3.

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2

Sh. Iskhakov, T., A. M. Pérez, K. Yu. Spasibko, M. V. Chekhova, and G. Leuchs. "Superbunched bright squeezed vacuum state." Optics Letters 37, no. 11 (2012): 1919. http://dx.doi.org/10.1364/ol.37.001919.

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3

Yuan, Hong-Chun, and Xue-Xiang Xu. "Squeezed vacuum state in lossy channel as a squeezed thermal state." Modern Physics Letters B 29, no. 33 (2015): 1550219. http://dx.doi.org/10.1142/s021798491550219x.

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In this paper, we alternatively study the evolution of squeezed vacuum state (SVS) in lossy channel by virtue of the phase space method. By using the formula of Wigner function (WF) in coherent representation and [Formula: see text] representation of quantum density operator, the WF formula in lossy channel is derived. After obtaining the analytical expressions of the WFs of the lossy SVS and the squeezed thermal state (STS), we further prove the fact that the lossy SVS is equivalent to a kind of STS. Our result is useful in dealing with the light field transmission problems in the presence of losses.

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4

Gao, Yinghao, Jinxia Feng, Yuanji Li, and Kuanshou Zhang. "Generation and Measurement of Squeezed Vacuum States at Audio-Band Frequencies." Applied Sciences 9, no. 7 (2019): 1272. http://dx.doi.org/10.3390/app9071272.

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Squeezed vacuum states at audio-band frequencies are important quantum resources for practical applications. We demonstrated the generation of squeezed vacuum states at the audio-band frequencies from a subthreshold optical parametric oscillator with a periodically poled KTiOPO4 crystal pumped by a homemade continuous wave single-frequency dual-wavelength laser. To detect squeezed vacuum states at audio-band frequencies, the influences of the local oscillator (LO) power, the common mode rejection ratio (CMRR) of balanced homodyne detectors, and the phase jitter between the LO and squeezed vacuum field on the measurement of squeezed vacuum states at audio-band frequencies were considered. By optimizing the LO power, improving the CMRR of photodetectors to 67 dB based on the design of differential fine-tuning circuit and adjustable bias voltage, and reducing the phase jitter between the LO and squeezed vacuum field to 1.7° with the help of the coherent locking technique, 6.1 ± 0.3 dB squeezed vacuum states at audio frequencies from 5 kHz to 20 kHz were generated. A 3.0 ± 0.3 dB phase squeezed vacuum state was obtained at the audio frequency of 3.5 kHz.

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5

Abebe, Tamirat, Demissie Jobir, Chimdessa Gashu, and Ebisa Mosisa. "Interaction of Two-Level Atom with Squeezed Vacuum Reservoir." Advances in Mathematical Physics 2021 (January 29, 2021): 1–7. http://dx.doi.org/10.1155/2021/6696253.

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In this paper, the quantum properties of a two-level atom interaction with squeezed vacuum reservoir is throughly analyzed. With the aid of the interaction Hamiltonian and the master equation, we obtain the time evolution of the expectation values of the atomic operators. Employing the steady-state solution of these equations, we calculate the power spectrum and the second-order correlation function for the interaction of two-level atom with squeezed vacuum reservoir. It is found that the half width of the power spectrum of the light increases with the squeeze parameter, r . Furthermore, in the absence of decay constant and interaction time, it enhances the probability for the atom to be in the upper level.

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6

VENKATARATNAM, K. K., and P. K. SURESH. "DENSITY FLUCTUATIONS IN THE OSCILLATORY PHASE OF A NONCLASSICAL INFLATON IN THE FRW UNIVERSE." International Journal of Modern Physics D 17, no. 11 (2008): 1991–2005. http://dx.doi.org/10.1142/s0218271808013662.

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The use of the coherent and squeezed state formalisms of quantum optics for a minimally coupled nonclassical inflaton in the FRW metric is studied, in the semiclassical theory of gravity. The leading order solutions to the semiclassical Einstein equations in the coherent, squeezed and squeezed vacuum states are obtained perturbatively and exhibit power law expansion behavior. The validity of the semiclassical theory is examined in the squeezed vacuum state in the oscillatory phase of the inflaton. The semiclassical theory in the oscillatory phase of the nonclassical inflaton holds only if the associated squeezing parameter is much smaller than unity. Quantum fluctuations of the inflaton are also examined in the coherent and squeezed state formalisms.

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7

SURESH, P. K. "NONCLASSICAL STATE REPRESENTATION OF INFLATON AND POWER-LAW EXPANSION IN FRW UNIVERSE." Modern Physics Letters A 16, no. 38 (2001): 2431–38. http://dx.doi.org/10.1142/s0217732301005874.

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We have examined a homogeneous massive scalar field minimally coupled to the spatially flat Friedmann–Robertson–Walker metric, in squeezed and coherent state formalisms, in semiclassical theory of gravity. In the oscillatory phase of inflaton, the approximate leading solution to the semiclassical Einstein equation has the same power-law expansion as that of the classical Einstein equation for both coherent and squeezed state formalisms. Quantum fluctuations of the inflaton in coherent and squeezed vacuum states are studied, by using dispersion relations. The uncertainty relation for coherent state does not depend on the coherent state parameter while the uncertainty relation for squeezed vacuum state depends on the associated squeezing parameter and squeezing angle.

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8

SHARABY, Y. A., S. S. HASSAN, and S. M. A. MAIZE. "SQUEEZED VACUUM AND TRANSVERSE FIELD EFFECTS IN A THREE-LEVEL BISTABLE MODEL." International Journal of Modern Physics B 20, no. 11n13 (2006): 1629–39. http://dx.doi.org/10.1142/s0217979206034169.

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Optical bistability for three-level V-type atomic medium in ring cavity is examined in the presence of squeezed vacuum field within and without plane wave approximations. Squeezed Vacuum parameters affects the steady state behavior of the system. Gaussian field feature causes a significant change in the steady state behavior.

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9

Mitra, Saibal, and Sourangshu Mukhopadhyay. "Analytical investigation on interactions among squeezed vacuum and coherent state, coherent vacuum and squeezed state, and among phase squeezed and amplitude squeezed states of light." Optik 125, no. 16 (2014): 4497–500. http://dx.doi.org/10.1016/j.ijleo.2014.03.013.

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10

Karimi, Amir. "Superposition and entanglement of two-mode squeezed vacuum states." International Journal of Quantum Information 16, no. 01 (2018): 1850003. http://dx.doi.org/10.1142/s021974991850003x.

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In this paper, by using the parity operator as well as the two-mode squeezing operator, we define new operators which by the action of them on the vacuum state of the two-mode radiation field, superposition of two two-mode squeezed vacuum states and entangled two-mode squeezed vacuum states are generated.

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11

HU, LI-YUN, and HONG-YI FAN. "SQUEEZING ENHANCED THREE-MODE ENTANGLED STATE." Modern Physics Letters B 22, no. 22 (2008): 2055–61. http://dx.doi.org/10.1142/s0217984908016662.

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By virtue of the technique of integration within an ordered product of operators (Fan et al., Ann. Phys.321 (2006) 480) we construct a kind of three-mode entangled squeezed state in the Fock space, which exhibits stronger squeezing in one quadrature than that of the usual two-mode squeezed vacuum state.

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12

ZHU, YANYANG, GUANGQIANG HE, and GUIHUA ZENG. "UNBIASED QUANTUM RANDOM NUMBER GENERATION BASED ON SQUEEZED VACUUM STATE." International Journal of Quantum Information 10, no. 01 (2012): 1250012. http://dx.doi.org/10.1142/s0219749912500128.

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In this paper, a new quantum random number generation scheme which is implemented by measuring quantum noise of the squeezed vacuum state is proposed. In the proposed scheme, the Shannon entropy is employed to measure randomness of the generated random numbers. In addition, some characteristics of the generated random numbers are investigated. To reach the pure quantum randomness, an extraction approach based on universal hash functions for the generated quantum random numbers is presented. Results show that the proposed scheme based on squeezed vacuum state has remarkable advantages over the one associated with the vacuum state.

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13

XU, XUE-XIANG, LI-YUN HU, and HONG-YI FAN. "ON THE NORMALIZED TWO-MODE PHOTON-SUBTRACTED SQUEEZED VACUUM STATE." Modern Physics Letters A 24, no. 32 (2009): 2623–30. http://dx.doi.org/10.1142/s0217732309031168.

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We show that the two-mode photon-subtracted squeezed state (TPSSS) is a squeezed two-variable Hermite polynomial excitation state, and we can therefore determine its normalization as a Jacobi polynomial of the squeezing parameter. Some new relations about the Jacobi polynomials are obtained by this analysis. We also show that the TPSSS can be treated as a two-variable Hermite-polynomial excitation on squeezed vacuum state. The technique of integration within an ordered product of operators brings convenience in our derivation.

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14

Podoshvedov, Mikhail S., and Sergey A. Podoshvedov. "Gain sensitivity of the Mach–Zehnder interferometer by photon subtraction." Laser Physics Letters 21, no. 12 (2024): 125211. http://dx.doi.org/10.1088/1612-202x/ad8cc2.

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Abstract The phase sensitivity of a Mach–Zehnder (MZ) interferometer with a two-mode squeezed vacuum (TMSV) probe state is studied. At the initial stage, the TMSV state is deterministically converted into two single-mode squeezed vacuum (SMSV) states, from each of which photons are subtracted via photon-number resolving measurement in auxiliary measurement modes. The new probe state can already demonstrate gain sensitivity of more than 20 dB with input squeezing of 5 dB and follow Heisenberg scaling. The phase sensitivity of the MZ interferometer, estimated by measuring the intensity difference of two measurement-induced continuous variable states, can surpass the ultimate one with SMSV probe states, at least, with squeezing less than 5 dB. In general, the strategy with preliminary subtraction of photons significantly increases the estimate potential of weakly squeezed states as the probe in MZ phase-dependent interferometry; in particular, it is more effective compared to generating highly squeezed TMSV states or SMSV states.

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15

Qint, Guo. "Husimi Function of Excited Squeezed Vacuum State." Communications in Theoretical Physics 49, no. 5 (2008): 1305–9. http://dx.doi.org/10.1088/0253-6102/49/5/48.

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16

SURESH, P. K., and V. C. KURIAKOSE. "SQUEEZED STATE REPRESENTATION OF QUANTUM FLUCTUATIONS AND SEMICLASSICAL THEORY." Modern Physics Letters A 13, no. 03 (1998): 165–72. http://dx.doi.org/10.1142/s0217732398000218.

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A squeezed state representation is constructed for each mode of a quantized scalar field in a classical spatially homogeneous anisotropic background cosmology. The expectation values of stress–energy tensor are calculated in squeezed vacuum states. The results for the fluctuations in energy density and anisotropic pressure are also presented.

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17

Lyu Jing-Fen and Ma Shan-Jun. "Fidelity of the photon subtracted (or added) squeezed vacuum state and squeezed cat state." Acta Physica Sinica 60, no. 8 (2011): 080301. http://dx.doi.org/10.7498/aps.60.080301.

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18

FAN, HONG-YI, LI-YUN HU, and XUE-XIANG XU. "LEGENDRE POLYNOMIALS AS THE NORMALIZATION OF PHOTON-SUBTRACTED SQUEEZED STATES." Modern Physics Letters A 24, no. 20 (2009): 1597–603. http://dx.doi.org/10.1142/s021773230902996x.

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By converting the photon-subtracted squeezed state (PSSS) to a squeezed Hermite-polynomial excitation state we find that the normalization factor of PSSS is an m-order Legendre polynomial of the squeezing parameter, where m is the number of subtracted photons. Some new relations about the Legendre polynomials are obtained by this analysis. We also show that the PSSS can also be treated as a Hermite-polynomial excitation on squeezed vacuum state.

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19

Eshete, S. "Effects of Reservoir Input Fields on the Non-Classical Features of Quantum Beat Cascade Laser." Ukrainian Journal of Physics 67, no. 1 (2022): 34. http://dx.doi.org/10.15407/ujpe67.1.34.

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The quantum features and quantum statistical properties of a cavity-mode radiation emitted from the coherently prepared degenerate three-level laser have been investigated, by using the standard quantum electrodynamics approach and accounting for the light-matter interaction. We considered the vacuum reservoir, squeezed vacuum reservoir, and thermal reservoir to see the effect of reservoir input fields on the statistical and squeezing nature on the cavity radiation. It is found that the squeezed vacuum reservoir has enhancement effect on the squeezing property, as well as the brightness of the cavity radiation compared to those of the vacuum and thermal reservoirs. It is also observed that the radiation emitted from the cavity is in the squeezed state with super-Poissonian photon statistics regardless of the reservoir nature.

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20

Abbasnezhad, Farkhondeh, Davood Afshar, and Mojtaba Jafarpour. "Steering evolution of two-mode Gaussian states in noisy environments." International Journal of Quantum Information 17, no. 04 (2019): 1950030. http://dx.doi.org/10.1142/s0219749919500308.

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Steering, a quantum property existing in some bipartite entangled systems, causes the local measurements on one part to change the state of the other part at any distance. In this paper, the dynamics of steering between two uncoupled oscillators in squeezed thermal, thermal and vacuum environments are compared. Assuming that the two oscillators are coupled to a common environment or two similar environments, the evolution of steering is obtained using Linblad equation in Born–Markov approximation. It is observed that when the two oscillators are initially in uni-modal squeezed states, the interaction with a common squeezed thermal environment induces steering between them after a short time. However, in other common and the two similar environments, steering does not appear. In addition, when two oscillators are initially in a squeezed thermal state, it is observed that steering decreases monotonically and disappears in a short time in common thermal, common vacuum and the two similar environments. Moreover, steering survives the most in a common squeezed thermal environment.

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21

Da Bao, Yang, and Hou Ji Xuan. "Geometric phases for two-mode squeezed vacuum state." International Journal of Physical Sciences 11, no. 12 (2016): 144–48. http://dx.doi.org/10.5897/ijps2015.4423.

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22

Tang, Xu-bing, Fang Gao, Yao-xiong Wang, Jian-guang Wu, and Feng Shuang. "Non-Gaussian features from excited squeezed vacuum state." Optics Communications 345 (June 2015): 86–98. http://dx.doi.org/10.1016/j.optcom.2015.01.053.

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23

Gong, Jinn-Ouk, and Misao Sasaki. "Squeezed primordial bispectrum from a general vacuum state." Classical and Quantum Gravity 30, no. 9 (2013): 095005. http://dx.doi.org/10.1088/0264-9381/30/9/095005.

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24

Xiang-Guo, Meng, Wang Ji-Suo, and Liang Bao-Long. "Normalized Excited Squeezed Vacuum State and Its Applications." Communications in Theoretical Physics 47, no. 5 (2007): 927–32. http://dx.doi.org/10.1088/0253-6102/47/5/033.

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25

Pan, Shu Mei, Bahetiguli Asilibieke, Li Zheng, Tian Tian, Xue Zhang, and Tai Yu Zheng. "The Dynamical Casimir Effect in Squeezed Vacuum State." International Journal of Theoretical Physics 58, no. 1 (2018): 22–30. http://dx.doi.org/10.1007/s10773-018-3906-0.

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26

MIR, MUBEEN A. "DIPOLE SQUEEZING OF THE ATOM IN A TWO-ATOM SYSTEM: EFFECTS OF THE SUPERPOSITION STATES." International Journal of Modern Physics B 08, no. 18 (1994): 2525–38. http://dx.doi.org/10.1142/s0217979294001019.

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Dipole squeezing of the atom in the presence of another atom is investigated for the one-photon and two-photon transition mechanism with the initial atoms in the two-atom squeezed state and the field in a vacuum, a coherent, or a squeezed state. For a vacuum input, the degree of squeezing is shown to depend on the photon multiplicity 'm' and the superposition angles of the atoms, θ1 and θ2. One of the quadratures of the atomic polarization is found to exhibit permanent squeezing only for some nonzero values of θ1, as well as θ2. The effect of θ2 on the dipole squeezing, however, is found to be negligible for the initial field in a coherent or a squeezed state. A comparison with the dipole squeezing of a single atom is also presented.

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27

Sivakumar, S. "Superposed coherent states improve fidelity of NOON states generated in post-selection." Canadian Journal of Physics 93, no. 4 (2015): 373–76. http://dx.doi.org/10.1139/cjp-2014-0030.

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Mixing the squeezed vacuum and coherent state in a beam splitter generates NOON states of the electromagnetic field, but with fidelity less than unity. In this article it is shown that the output of the beam splitter generates the NOON states with unit fidelity if superposed coherent states are used instead of the squeezed vacuum. Also, the post-selection probability of NOON states is shown to be higher.

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28

Nehra, Rajveer, Ryoto Sekine, Luis Ledezma, et al. "Few-cycle vacuum squeezing in nanophotonics." Science 377, no. 6612 (2022): 1333–37. http://dx.doi.org/10.1126/science.abo6213.

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One of the most fundamental quantum states of light is the squeezed vacuum, in which noise in one of the quadratures is less than the standard quantum noise limit. In nanophotonics, it remains challenging to generate, manipulate, and measure such a quantum state with the performance required for a wide range of scalable quantum information systems. Here, we report the development of a lithium niobate–based nanophotonic platform to demonstrate the generation and all-optical measurement of squeezed states on the same chip. The generated squeezed states span more than 25 terahertz of bandwidth supporting just a few optical cycles. The measured 4.9 decibels of squeezing surpass the requirements for a wide range of quantum information systems, demonstrating a practical path toward scalable ultrafast quantum nanophotonics.

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29

SURESH, P. K., V. C. KURIAKOSE, and K. BABU JOSEPH. "SQUEEZED STATE REPRESENTATION OF THE SCALAR FIELD AND VACUUM FLUCTUATIONS IN THE EARLY UNIVERSE." International Journal of Modern Physics D 04, no. 06 (1995): 781–92. http://dx.doi.org/10.1142/s0218271895000521.

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A squeezed state representation valid even near the singularity is constructed for each mode of a quantized scalar field in a spatially homogeneous and anisotropic background cosmology, and the problem of particle creation in an external field is examined by means of the squeezed state formalism of quantum optics. Using the squeezed state formalism the expectation values of the stress-energy tensor of the scalar field in curved space-time have been calculated. Quantum fluctuations of density and anisotropic pressure have also been calculated.

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30

Koumetio Armel, Azangue, Yiande Deuto Germain, Tene Alain Giresse, and Tchoffo Martin. "The dynamic of quantum entanglement of two dimensional harmonic oscillator in non-commutative space." Physica Scripta 96, no. 12 (2021): 125731. http://dx.doi.org/10.1088/1402-4896/ac42a9.

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Abstract In the present paper, we study the influence of non-commutativity on entanglement in a system of two oscillators-modes in interaction with its environment. The considered system is a two-dimensional harmonic oscillator in non-commuting spatial coordinates coupled to its environment. The dynamics of the covariance matrix, the separability criteria for two Gaussian states in non-commutative space coordinates, and the logarithmic negativity are used to evaluate the quantum entanglement in the system, which is compared to the commutative space coordinates case. The result is applied for two initially entangled states, namely the squeezed vacuum and squeezed thermal states. It can be observed that the phenomenon of entanglement sudden death appears more early in the system for the case of squeezed vacuum state than in the case of squeezed thermal state. Thereafter, it is also observed that non-commutativity effects lead to an increasing of entanglement of initially entangled quantum states, and reduce the separability in the open quantum system. It turns out that a separable state in the usual commutative quantum mechanics might be entangled in non-commutative extension.

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31

PENG, Z. H., J. ZOU, B. SHAO, and J. F. CAI. "CORRELATION OF SUPERCURRENTS IN TWO DISTANT MESOSCOPIC SQUID RINGS IN THE PRESENCE OF TWO-MODE NONCLASSICAL FIELD." International Journal of Modern Physics B 19, no. 11 (2005): 1965–71. http://dx.doi.org/10.1142/s0217979205029614.

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In this paper we consider two distant mesoscopic superconducting quantum interference device (SQUID) rings A and B in the presence of two-mode squeezed vacuum state field, and aim to see the effect of the field on the correlation of supercurrents in the two rings. We know the degree of entanglement of the two-mode squeezed vacuum state increases with the squeezing parameter r. In this paper we find that the correlation of the supercurrents increases with the parameter r too, meaning that the correlation of the supercurrents increases with the degree of entanglement of the field.

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32

Xu, Ye-Jun, Hong-Chun Yuan, and Qiu-Yu Liu. "Excited Two-Mode Generalized Squeezed Vacuum State as a Squeezed Two-Variable Hermite Polynomial Excitation State." International Journal of Theoretical Physics 49, no. 5 (2010): 1106–17. http://dx.doi.org/10.1007/s10773-010-0290-9.

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33

Tang, Shiqing, Xi Jiang, Xinwen Wang, and Xingdong Zhao. "Implementation of Photonic Phase Gate and Squeezed States via a Two-Level Atom and Bimodal Cavity." Photonics 9, no. 8 (2022): 583. http://dx.doi.org/10.3390/photonics9080583.

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We propose a theoretical model for realizing a photonic two-qubit phase gate in cavity QED using a one-step process. The fidelity and probability of success of the conditional quantum phase gate is very high in the presence of cavity decay. Our scheme only employs one two-level atom, and thus is much simpler than other schemes involving multi-level atoms. This proposal can also be applied to generate two-mode squeezed states; therefore, we give three examples, i.e., the two-mode squeezed vacuum state, two-mode squeezed odd coherent state, and two-mode squeezed even coherent state, to estimate the variance of Duan’s criterion when taking into account cavity decay. It is shown that the variance is smaller than 2 for the three squeezed states in most cases. Furthermore, we utilize logarithmic negativity to measure the entanglement, and find that these squeezed states have very high degrees of entanglement.

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34

Mishra, Karunesh K., and Stefan Ataman. "Optimizing States for Quantum-Enhanced Interferometry: Two Case Studies." Journal of Physics: Conference Series 2894, no. 1 (2024): 012016. http://dx.doi.org/10.1088/1742-6596/2894/1/012016.

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Abstract In this work we address the optimization of two important quantum states in terms of interferometric phase sensitivity, given a constraint on the total average number of input photons, N ¯ We use the quantum Fisher information (QFI) as our main tool. We employ both the single- and two-parameter QFI in order to address detection schemes having, and respectively, not having access to an external phase reference. The first quantum state we consider is the coherent plus squeezed vacuum input and find the optimum coherent fraction that maximizes both the single- and two-parameter QFI. We also discuss detection schemes able to perform almost optimally. Finally, we consider the double squeezed vacuum input and determine the squeezed fraction between the inputs that maximizes the QFI. Similar to the previous input state, we also provide detection schemes able to perform optimally.

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35

Cheng, Yan-Bei, Sheng-Guo Guan, Zu-Jian Wang, and Xue-Xiang Xu. "Comparative analysis of properties for amplified coherent state and amplified squeezed vacuum." Modern Physics Letters B 34, no. 33 (2020): 2050377. http://dx.doi.org/10.1142/s0217984920503777.

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Two “amplified” quantum states, that is, amplified coherent state (ACS) and amplified squeezed vacuum (ASV), are considered in this paper by applying operator [Formula: see text] on coherent state (CS) and squeezed vacuum (SV), respectively. Here [Formula: see text] [Formula: see text] denotes a amplification factor and [Formula: see text]) denote the creation (annihilation) operator. Along these two lines, we make a comparative analysis of properties for ACS and ASV. The considered properties include density matrix elements, Wigner function, mean photon number, second-order autocorrelation function, and quadrature squeezing. We derive analytical expressions and make numerical simulations for all the properties. The noteworthy results include: (1) the ACS has antibunching and squeezing characters; (2) the ASV will have the bunching and antibunching effect in small initial squeezing.

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36

MIR, MUBEEN A. "SECOND-ORDER AND AMPLITUDE-SQUARED SQUEEZING OF THE TWO TWO-LEVEL ATOMS WITH SUPERPOSITION STATE PREPARATION." International Journal of Modern Physics B 07, no. 26 (1993): 4439–50. http://dx.doi.org/10.1142/s0217979293003747.

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An analysis of the second-order and amplitude-squared (AS) squeezing is presented for the two atoms prepared in a two-atom squeezed state using coherent and squeezed field inputs. The system produce strong sqeezing and superposition angle (θ) is more effective for small values of average photon number [Formula: see text] as compared to that of large one. The degree of squeezing of both types increases as θ increases for coherent field input with small [Formula: see text]. Some values of θ for the initial field in a squeezed-vacuum state with any value of input squeezing can make one of the quadrature of the both types of squeezing permanently squeezed for T≥0. For the initial field in a more general squeezed state, the second-order and AS squeezing behave randomly for different values of θ.

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37

Dat, Tran Quang, Truong Minh Thang, and Truong Minh Duc. "Non-classical properties and generation schemes of superposition of multiple-photon-added two-mode squeezed vacuum state." Hue University Journal of Science: Natural Science 130, no. 1B (2021): 5–12. http://dx.doi.org/10.26459/hueunijns.v130i1b.6028.

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In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.

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38

Anh, Nguyen Pham Quynh. "Generation of plasmon-polaritons in epsilon-near-zero polaritonic metamaterial." Hue University Journal of Science: Natural Science 130, no. 1B (2021): 35–41. http://dx.doi.org/10.26459/hueunijns.v130i1b.6180.

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In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.

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WANG JI-SUO and SUN CHANG-YONG. "QUANTUM FLUCTUATION OF MESOSCOPIC CIRCUIT IN SQUEEZED VACUUM STATE." Acta Physica Sinica 46, no. 10 (1997): 2007. http://dx.doi.org/10.7498/aps.46.2007.

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FAN You-ji, 范有机, and 卢道明 LU Dao-ming. "High Order Nonclassical Properties of the Squeezed Vacuum State." Acta Sinica Quantum Optica 25, no. 3 (2019): 252–58. http://dx.doi.org/10.3788/jqo20192503.0102.

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Qing-Ping, Zhou, Fang Mao-Fa, Liu Xiao-Juan, Chen Xiao-Mei, and Wu Qin. "Entanglement Manipulation for a Two-Mode Squeezed Vacuum State." Chinese Physics Letters 21, no. 9 (2004): 1692–94. http://dx.doi.org/10.1088/0256-307x/21/9/004.

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Tianli Wei, 魏天丽, 吴德伟 Dewei Wu, 李响 Xiang Li, 朱浩男 Haonan Zhu, and 王湘林 Xianglin Wang. "Entanglement Characteristics of Squeezed Vacuum State After Beam Splitter." Laser & Optoelectronics Progress 56, no. 15 (2019): 152701. http://dx.doi.org/10.3788/lop56.152701.

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Zayed, E. M. E., A. S. Daoud, M. A. AL-Laithy, and E. N. Naseem. "The Wigner distribution function for squeezed vacuum superposed state." Chaos, Solitons & Fractals 24, no. 4 (2005): 967–75. http://dx.doi.org/10.1016/j.chaos.2004.09.048.

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Xiang-Guo, Meng, Wang Ji-Suo, and Liang Bao-Long. "Two-Mode Excited Squeezed Vacuum State and Its Properties." Communications in Theoretical Physics 49, no. 5 (2008): 1299–304. http://dx.doi.org/10.1088/0253-6102/49/5/47.

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HU, B. L., G. KANG, and A. MATACZ. "SQUEEZED VACUA AND THE QUANTUM STATISTICS OF COSMOLOGICAL PARTICLE CREATION." International Journal of Modern Physics A 09, no. 07 (1994): 991–1007. http://dx.doi.org/10.1142/s0217751x94000455.

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We use the language of squeezed states to give a systematic description of two issues in cosmological particle creation: (a) Dependence of particle creation on the initial state specified; we consider in particular the number state, the coherent state and the squeezed state; (b) the relation of spontaneous and stimulated particle creation and their dependence on the initial state. We also present results for the fluctuations in particle number in anticipation of its relevance to defining noise in quantum fields and the vacuum susceptibility of space–time.

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Li-Yun, Hu, and Fan Hong-Yi. "Two-Variable Hermite Polynomial Excitation of Two-Mode Squeezed Vacuum State as Squeezed Two-Mode Number State." Communications in Theoretical Physics 50, no. 4 (2008): 965–70. http://dx.doi.org/10.1088/0253-6102/50/4/35.

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Zhang, Yan, Juan Yu, Peng-Fei Yang, and Jun-Xiang Zhang. "Preparation of continuously tunable orthogonal squeezed light filed corresponding to cesium D<sub>1</sub> line." Acta Physica Sinica 71, no. 4 (2022): 044203. http://dx.doi.org/10.7498/aps.71.20211382.

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The non-classical light resonance on the cesium D<sub>1</sub> (894.6 nm) line has important applications in solid-state quantum information networks due to its unique advantages. The cesium D<sub>1</sub> line has a simplified hyperfine structure and can be used to realize a light-atom interface. In our previous work, we demonstrated 2.8-dB quadrature squeezed vacuum light at cesium D<sub>1</sub> line in an optical parametric oscillator(OPO) with a periodically poled KTP(PPKTP) crystal. However, the squeezing level is relatively low, and the tunability that has practical significance for squeezed light has not been further investigated. Theoretically, the increase of the transmittance of output mirror and the decrease of the intra-cavity loss of the OPO can improve the squeezing level. Here, we use super-polished and optimal coating cavity mirrors to improve the nonlinear process in OPO. We prepare 447.3 nm blue light from 894.6 nm fundamental light by a second harmonic generation cavity (SHG). The SHG is a two-mirror standing-wave cavity with a PPKTP crystal as the nonlinear medium. The power of generated blue laser is 32 mW when the incident infrared power is 120 mW. Using the blue light to pump an OPO, we achieve quadrature squeezed vacuum light at cesium D<sub>1</sub> line. The OPO is a two-mirror standing-wave cavity with a PPKTP crystal. The threshold of OPO is reduced to 28 mW. The squeezing level of generated quadrature squeezed vacuum light is increased to 3.3 dB when the pump power is 15 mW. Taking into account the overall detection efficiency, the actual squeezing reaches 5.5 dB. We inject a weak signal beam into the OPO cavity to act as an optical parametric amplifier (OPA), and test the tunability of squeezzed light. The blue light and the squeezed light are tuned by using a low-frequency triangular wave signal to scan the Ti: sapphire laser. Gradually increasing the amplitude of the scanning triangle wave signal, the generated bright squeezed light can be continuously tuned over a range around 80 MHz without losing the stability of the whole system. The generated squeezed light offers the possibility for the efficient coupling between the non-classical source and solid medium in the process of quantum interface.

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Bin, Shao, Zou Jian, and Li Qian-Shu. "Squeezing Properties in Mesoscopic Josephson Junction with Nonclassical Radiation Field." Modern Physics Letters B 12, no. 16 (1998): 623–31. http://dx.doi.org/10.1142/s0217984998000731.

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We consider a system of mesoscopic Josephson junction interacting with nonclassical radiation field and investigate any order squeezing for the mesoscopic Josephson junction subsystem. Our results show that if the field is initially prepared in a squeezed vacuum and the junction is in its lowest energy state (the vacuum state), then as the time evolves the Josephson junction subsystem can exhibit any order squeezing.

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GHAYOUR, BASEM, and P. K. SURESH. "B MODE CORRELATION ENHANCEMENT OF CMB FROM THERMAL SQUEEZED VACUUM STATE." International Journal of Modern Physics D 22, no. 02 (2013): 1350002. http://dx.doi.org/10.1142/s0218271813500028.

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The generated gravitational waves during inflation are placed in thermal squeezed vacuum state. The B mode angular power spectrum of the CMB anisotropy is found enhanced for all multipole moments l ⩾ 2 but less than the upper bound of the WMAP 7-year data.

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XU, XING-LEI, HONG-QI LI, SHI-MIN XU, and JI-SUO WANG. "THE QUANTUM FLUCTUATIONS OF MESOSCOPIC DAMPED MUTUAL INDUCTANCE COUPLED DOUBLE RESONANCE RLC CIRCUIT AT FINITE TEMPERATURE." International Journal of Modern Physics B 21, no. 27 (2007): 4725–38. http://dx.doi.org/10.1142/s0217979207038101.

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Mesoscopic damped mutual inductance coupled double resonance RLC circuit is quantized by the method of damped harmonic oscillator quantization and linear transformation. The energy levels of this circuit are given. By thermo-field dynamics (TFD), the quantum fluctuations of the current and voltage of each loop are researched in the thermal vacuum state, thermal coherent state and thermal squeezed state. It is shown that the quantum fluctuations of the current and voltage are related not only to the circuit inherent parameter and coupled magnitude of mutual inductance, but also squeezed coefficients, squeezed angle, environmental temperature and damped resistance. Furthermore, because of environmental temperature and damped resistance, the quantum fluctuations increase with the increase of temperature and decay along with time.

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