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International Journal of Theoretical Physics

Entanglement and Phase-Sensitivity of a Mach-Zehnder Interferometer for the Coherent Spin State Input

Xiao-Jie Yi

Published Dec 24, 2016• 0 citations
Publisher
DOI
10.1007/s10773-016-3253-y

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We investigate the phase sensitivity of the SU(1,1) interfereometer [SU(1,1)I] and the modified Mach–Zehnder interferometer (MMZI) with the entangled coherent states (ECS) as inputs. We consider the ideal case and the situations in which the photon losses are taken into account. We find that, under ideal conditions, the phase sensitivity of both the MMZI and the SU(1,1)I can beat the shot-noise limit (SNL) and approach the Heisenberg limit (HL). In the presence of photon losses, the ECS can beat the coherent and squeezed states as inputs in the SU(1,1)I, and the MMZI is more robust against internal photon losses than the SU(1,1)I.