Abstract

We study the improvement in the phase sensitivity of a Mach–Zehnder interferometer using the superposition of Schrödinger’s cat-like state with the Fock state (SCFS) and the coherent state as inputs. With this setup, we examine the effect on phase sensitivity of the interferometer using a two-channel detection (TCD) scheme [Opt. Express 29, 95 (2021) [CrossRef]  ] in which we take the optimal combination of the intensities of both output ports. We find better phase sensitivity under some conditions for this setup as compared to other known combinations of inputs such as squeezed vacuum and coherent states, vacuum and coherent states, etc. Therefore, we expect that the SCFS may be an alternative nonclassical resource for improvement in the phase sensitivity of a Mach–Zehnder interferometer, having potential application in quantum sensing.

© 2021 Optical Society of America

Enhancement of the phase sensitivity with two-mode squeezed coherent state based on a Mach-Zehnder interferometer

Jun Liu, Tao Shao, Yuanxiang Wang, Mingming Zhang, Youyou Hu, Dongxu Chen, and Dong Wei
Opt. Express 31(17) 27735-27748 (2023)

SU(1,1) interferometry with parity measurement

Shuai Wang and Jian-Dong Zhang
J. Opt. Soc. Am. B 38(9) 2687-2693 (2021)

Phase sensitivity of a quantum Mach-Zehnder interferometer for a coherent state input

Taesoo Kim and Heonoh Kim
J. Opt. Soc. Am. B 26(4) 671-675 (2009)

Optimal quantum phase estimation with generalized multi-component Schrödinger cat states

Seung-Woo Lee, Su-Yong Lee, and Jaewan Kim
J. Opt. Soc. Am. B 37(8) 2423-2429 (2020)

Two-mode quantum interferometry with a single-mode Fock state and parity detection

Shuai Wang, Yaoting Wang, Liangjun Zhai, and Lijian Zhang
J. Opt. Soc. Am. B 35(5) 1046-1053 (2018)