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Quantum optical interferometry via general photon-subtracted two-mode squeezed states
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作者 Li-Li Hou Jian-Zhong Xue +1 位作者 yong-xing sui Shuai Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期258-264,共7页
We investigate the sensitivity of phase estimation in a Mach-Zehnder interferometer with photon-subtracted twomode squeezed vacuum states.Our results show that, for given initial squeezing parameter, both symmetric an... We investigate the sensitivity of phase estimation in a Mach-Zehnder interferometer with photon-subtracted twomode squeezed vacuum states.Our results show that, for given initial squeezing parameter, both symmetric and asymmetric photon subtractions can further improve the quantum Cramér-Rao bound(i.e., the ultimate phase sensitivity), especially for single-mode photon subtraction.On the other hand, the quantum Cramér-Rao bound can be reached by parity detection for symmetric photon-subtracted two-mode squeezed vacuum states at particular values of the phase shift, but it is not valid for asymmetric photon-subtracted two-mode squeezed vacuum states.In addition, compared with the two-mode squeezed vacuum state, the phase sensitivity via parity detection with asymmetric photon-subtracted two-mode squeezed vacuum states will be getting worse.Thus, parity detection may not always be the optimal detection scheme for nonclassical states of light when they are considered as the interferometer states. 展开更多
关键词 QUANTUM OPTICS phase sensitivity QUANTUM METROLOGY
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Quantum interferometry via a coherent state mixed with a squeezed number state
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作者 Li-Li Hou yong-xing sui +1 位作者 Shuai Wang Xue-Fen Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第4期196-201,共6页
We theoretically investigate the phase sensitivity with parity measurement on a Mach–Zehnder interferometer with a coherent state combined with a squeezed number state. Within a constraint on the total mean photon nu... We theoretically investigate the phase sensitivity with parity measurement on a Mach–Zehnder interferometer with a coherent state combined with a squeezed number state. Within a constraint on the total mean photon number, we find, via parity measurement, that the mixing of a coherent state and squeezed number state can give better phase sensitivity than mixing a coherent state and squeezed vacuum state when the phase shift deviates from the optimal phase φ= 0. In addition,we show that the classical Fisher information for parity measurement saturates the quantum Fisher information when the phase shift approaches to zero. Thus, the quantum Crame′r–Rao bound can be reached via the parity measurement in the case of φ= 0. 展开更多
关键词 QUANTUM OPTICS phase sensitivity QUANTUM METROLOGY
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