【摘 要】
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We investigate the sensitivity of phase estimation in a Mach-Zehnder interferometer with photon-subtracted two-mode squeezed vacuum states.Our results show that
【机 构】
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School of Mathematics and Physics,Jiangsu University of Technology,Changzhou 213001,China
论文部分内容阅读
We investigate the sensitivity of phase estimation in a Mach-Zehnder interferometer with photon-subtracted two-mode 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.
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