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Statistical properties of coherent photon-subtracted two-mode squeezed vacuum and its application in quantum teleportation

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Chinese Physics B 2014年第5期23卷 46-51页

作者：张国平郑凯敏刘世右胡利云 College of Physics and Communication Electronics Jiangxi Normal University Key Laboratory of Optoelectronic and Telecommunication of Jiangxi

We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is only related to the Legendre polynomials, which is a compact expression. Its statistical properties are discussed by the negative region Wigner function with the analytical expression. As an application, the quantum teleportation for coherent states is considered by using the non-Gaussian state as an entangled channel. It is found that the teleportation fidelity can be enhanced by this non-Gaussian operation.

关键词： coherent photon subtraction two-mode squeezed vacuum quantum teleportation fidelity

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Evolution of a two-mode squeezed vacuum for amplitude decay via continuous-variable entangled state approach

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Frontiers of physics 2018年第5期13卷 231-239页

作者： Xiang-Guo Meng Ji-Suo Wang Bao-Long Liang Cheng-Xuan Han School of Physical Science and Information Engineerig Liaocheng University Liaocheng 252059 China Shandong Provincial Key Laboratory of Optical Communication Science and Technology Liaocheng University Liaocheng 252059 China Shandong Provincial Key Laboratory of Laser Polarization and Information Technology College of Physics and Engineering Qufu Normal University Qufu 273165 China

Extending the recent work completed by Fan et al. [Front. Phys. 9（1）, 74 （2014）] to a two-mode case, we investigate how a two-mode squeezed vacuum evolves when it undergoes a two-mode amplitude dissipative channel, with the same decay rate ~, using the continuous-variable entangled state approach. Our analytical results show that the initial pure-squeezed vacuum state evolves into a definite mixed state with entanglement and squeezing, decaying over time as a result of amplitude decay. We also investigate the time evolutions of the photon number distribution, the Wigner function, and the optical tomogram in this channel. Our results indicate that the evolved photon number distribution is related to Jacobi polynomials, the Wigner function has a standard Gaussian distribution （corresponding to the vacuum） at long periods, losing its nonclassicality due to amplitude decay, and a larger squeezing leads to a longer decay time.

关键词： two-mode squeezed vacuum amplitude decay continuous-variable entangled staterepresentation photon number distribution Wigner function optical tomogram

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