Quantum theory of cross-correlation heterodyne detection
- URL: http://arxiv.org/abs/2209.05141v1
- Date: Mon, 12 Sep 2022 10:50:43 GMT
- Title: Quantum theory of cross-correlation heterodyne detection
- Authors: Sheng Feng and Kaikai Wu
- Abstract summary: Cross-correlation heterodyne detectors exhibit the potential for suppression of the detection quantum noise below shot noise.
We develop a quantum theory to describe the noise performance of cross-correlation heterodyne detectors.
This work may find itself useful in space-based gravitational wave searching and a variety of other scientific research activities.
- Score: 2.958827111645536
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Cross-correlation heterodyne detectors exhibit the potential for suppression
of the detection quantum noise below shot noise without use of optical
squeezing for capturing weak optical signals in low frequency bands. To
understand the underlying mechanism, we develop a quantum theory to describe
the noise performance of cross-correlation heterodyne detectors. By calculating
the cross spectral density (CSD) of the photocurrent fluctuations from a
cross-correlation heterodyne detector, we prove that its noise performance can
break the shot noise limit and exceed that of a regular heterodyne detector for
detection of coherent light. When the detected light signal is in a squeezed
state, we show that the corresponding CSD value is negative and discuss how a
negative CSD may be explored to improve the output signal-to-noise ratio of the
detector contaminated by classical noises through tuning the parameter of the
degree of squeezing. This work may find itself useful in space-based
gravitational wave searching and a variety of other scientific research
activities, such as observation of vacuum magnetic birefringence and
telecommunications.
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