SU(2)-in-SU(1,1) Nested Interferometer for High Sensitivity, Loss-Tolerant Quantum Metrology

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

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Author(s)

  • Wei Du
  • Jia Kong
  • Guzhi Bao
  • Peiyu Yang
  • Jun Jia
  • Sheng Ming
  • Chun-Hua Yuan
  • J. F. Chen
  • Morgan W. Mitchell
  • Weiping Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Number of pages6
Journal / PublicationPhysical Review Letters
Volume128
Issue number3
Online published20 Jan 2022
Publication statusPublished - 21 Jan 2022

Abstract

We present experimental and theoretical results on a new interferometer topology that nests a SU(2) interferometer, e.g., a Mach-Zehnder or Michelson interferometer, inside a SU(1,1) interferometer, i.e., a Mach-Zehnder interferometer with parametric amplifiers in place of beam splitters. This SU(2)-in-SU(1,1) nested interferometer (SISNI) simultaneously achieves a high signal-to-noise ratio (SNR), sensitivity beyond the standard quantum limit (SQL) and tolerance to photon losses external to the interferometer, e.g., in detectors. We implement a SISNI using parametric amplification by four-wave mixing (FWM) in Rb vapor and a laser-fed Mach-Zehnder SU(2) interferometer. We observe path-length sensitivity with SNR 2.2 dB beyond the SQL at power levels (and thus SNR) 2 orders of magnitude beyond those of previous loss-tolerant interferometers. We find experimentally the optimal FWM gains and find agreement with a minimal quantum noise model for the FWM process. The results suggest ways to boost the in-practice sensitivity of high-power interferometers, e.g., gravitational wave interferometers, and may enable high-sensitivity, quantum-enhanced interferometry at wavelengths for which efficient detectors are not available.

Citation Format(s)

SU(2)-in-SU(1,1) Nested Interferometer for High Sensitivity, Loss-Tolerant Quantum Metrology. / Du, Wei; Kong, Jia; Bao, Guzhi; Yang, Peiyu; Jia, Jun; Ming, Sheng; Yuan, Chun-Hua; Chen, J. F.; Ou, Z. Y.; Mitchell, Morgan W.; Zhang, Weiping.

In: Physical Review Letters, Vol. 128, No. 3, 21.01.2022.

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