Quantum dense metrology by an SU(2)-in-SU(1,1) nested interferometer

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

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Detail(s)

Original languageEnglish
Article number024003
Journal / PublicationApplied Physics Letters
Volume117
Issue number2
Online published14 Jul 2020
Publication statusPublished - Jul 2020
Externally publishedYes

Abstract

With the help of quantum entanglement, quantum dense metrology (QDM) is a technique that can make joint estimates of two conjugate quantities such as phase and amplitude modulations of an optical field, with an accuracy beating the standard quantum limit simultaneously. SU(1,1) interferometers (SUIs) can realize QDM with detection loss tolerance but is limited in absolute sensitivity. Here, we present a QDM scheme with a linear or SU(2) interferometer nested inside an SUI. By using a degenerate SUI and controlling the phase angle of the phase-sensitive amplifiers in the SUI, we can achieve the optimum quantum enhancement in the measurement precision of an arbitrary mixture of phase and amplitude modulation.

Citation Format(s)

Quantum dense metrology by an SU(2)-in-SU(1,1) nested interferometer. / Du, Wei; Chen, J. F.; Ou, Z. Y.; Zhang, Weiping.

In: Applied Physics Letters, Vol. 117, No. 2, 024003, 07.2020.

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