Heterodyne detection enhanced by quantum correlation

• URL: http://arxiv.org/abs/2103.01764v1
• Date: Tue, 2 Mar 2021 14:39:53 GMT
• Title: Heterodyne detection enhanced by quantum correlation
• Authors: Boya Xie and Sheng Feng
• Abstract summary: We show that the signal-to-noise ratio (SNR) degradation can be overcome when the image band vacuum is quantum correlated with the input signal. This work should be of great interest to ongoing space-borne gravitational-wave (GW) signal searching experiments.
• Score: 2.958827111645536
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Heterodyne detectors as phase-insensitive (PI) devices have found important applications in precision measurements such as space-based gravitational-wave (GW) observation. However, the output signal of a PI heterodyne detector is supposed to suffer from signal-to-noise ratio (SNR) degradation due to image band vacuum and imperfect quantum efficiency. Here we show that the SNR degradation can be overcome when the image band vacuum is quantum correlated with the input signal. We calculate the noise figure of the detector and prove the feasibility of heterodyne detection with enhanced noise performance through quantum correlation. This work should be of great interest to ongoing space-borne GW signal searching experiments.

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