Loss tolerant quantum absorption measurement. (9th October 2020)

• Record Type: Journal Article
• Authors: Okamoto, Ryo; Tokami, Yuta; Takeuchi, Shigeki
• Is Part Of: New journal of physics. Volume 22:Number 10(2020:Oct.)
• Publication Date: 2020-10-09
• Subjects: quantum metrology -- absorption spectroscopy -- quantum optics -- quantum interference -- quantum sensing; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/abbab4
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: The quantum statistics of entangled photon pairs promise greater performance for absorption measurements than can be achieved classically. However, the performance of a quantum approach is easily degraded under a loss of photons caused by experimental limitations. Here, we propose a loss-tolerant quantum scheme using quantum destructive interference in a nonlinear interferometer. Our theoretical results show that the loss-tolerant quantum scheme surpasses the conventional quantum scheme under photon loss at the detection stage. We demonstrate how photon losses at optical paths and mode-mismatches in a nonlinear interferometer affect the performance of our scheme. We also propose a hybrid approach to cope with the case where the quantum destructive interference is imperfect, and show that the hybrid scheme always surpasses the conventional quantum scheme.