Measurement-Dependent Erasure of Distinguishability for the Observation of Interference in an Unbalanced SU(1,1) Interferometer

Nan Huo; Liang Cui; Yunxiao Zhang; Wen Zhao; Xueshi Guo; Z. Y. Ou; Xiaoying Li

doi:10.1103/PRXQuantum.3.020313

Measurement-Dependent Erasure of Distinguishability for the Observation of Interference in an Unbalanced SU(1,1) Interferometer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Overview

4 Scopus Citations

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Author(s)

Nan Huo
Liang Cui
Yunxiao Zhang
Wen Zhao
Xueshi Guo
Xiaoying Li

Related Research Unit(s)

Department of Physics

Detail(s)

Original language	English
Article number	020313
Journal / Publication	PRX Quantum
Volume	3
Issue number	2
Online published	19 Apr 2022
Publication status	Published - Jun 2022

Link(s)

DOI	DOI https://doi.org/10.1103/PRXQuantum.3.020313 Final Published version
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Attachment(s)	Documents 103282970.pdf Final Published version, 1.24 MB, PDF Publisher's Copyright Statement This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85128856355&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(ad5a16d4-75ac-4816-baa8-d7fdbcdd67e9).html

Abstract

It is known that quantum interference can disappear with the mere possibility of distinguishability without actually performing the act but can be restored by erasing the path information. A common erasure method is by conditional projective measurement known as a "quantum eraser." On the other hand, the essence of quantum interference is amplitude addition. So, direct amplitude measurement and subsequent addition can also lead to the recovery of interference. In this paper, we create temporal distinguishability in an unbalanced SU(1,1) interferometer and observe no interference in the direct photodetection of the outputs. Different from the quantum eraser scheme, we recover interference via amplitude measurement by homodyne detection even with distinguishability in photon generation but no conditional projective measurement. The new mechanism of recovering interference can be applied to other unbalanced interferometers and should have practical applications in quantum metrology and sensing.