26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

TMSV-Enabled Ultra-Sensitive Interferometry with Phase-Independence

Not scheduled

20m

Belinda Hutchinson Building (The University of Sydney )

Poster ANZOS | Quantum Computing and Quantum Information (ANZCOP QCQI)

Description

Abstract

The nonlocal correlations between entangled particles establish quantum entanglement as a fundamental resource for quantum information processing, including quantum communication, computing, and metrology [1]. Compared to conventional Gaussian entangled states, such as the two-mode squeezed vacuum state (TMSV), non-Gaussian entangled states generated via operations like photon subtraction (PS-TMSV), quantum scissors, quantum catalysis, and one-single photon subtraction, exhibit enhanced entanglement [2]. In previous work, we proposed two types of such non-Gaussian states: the two-mode photon-subtracted squeezed vacuum (TMPSSV) state and the coherently symmetrical single-photon-subtracted two-mode squeezed vacuum (CSSPS-TMSV) state [2, 3]. In this paper, we propose a quantum Mach-Zehnder interferometer (MZI) utilizing the CSSPS-TMSV. Compared to MZIs based on TMSV and PS-TMSV, the CSSPS-TMSV-based MZI achieves lower phase uncertainty, demonstrating superior sensitivity. Notably, unlike its Gaussian and PS-TMSV counterparts, our proposed scheme is inherently phase-independent; consequently, supersensitivity can be achieved regardless of the unknown phase being measured. Additionally, the CSSPS-TMSV yields a lower quantum Cramér-Rao bound (QCRB), further confirming the superior performance of the proposed MZI. Therefore, this work provides an effective framework for achieving supersensitive, phase-independent quantum metrology.
References
[1]K. S. Chou, J. Z. Blumoff, C. S. Wang, P. C. Reinhold, C. J. Axline, Yvonne Y. Gao, L. Frunzio, M. H. Devoret, L. Jiang, and R. J. Schoelkopf, Deterministic teleportation of a quantum gate between two logical qubit, Nature (London) 561, 368 (2018).
[2]H. Song, G. Zhang, H. Yonezawa, Strong quantum entanglement based on two-mode photon-subtracted squeezed vacuum states, Phys. Rev, A, 108, pp.052420, 2023
[3]H. Song, H. Huang, H. Liu, A. Zhou, G. Zhang, and H.Yonezawa, Quantum Entanglement Based on Two-Photon Joint Subtraction from Two-Mode Squeezed Vacuum States, IEEE Opto-Electronics and Communications Conference (OECC), 1-3，2024