Direct approach to realising quantum filters for high-precision measurements

• URL: http://arxiv.org/abs/2002.07644v6
• Date: Mon, 8 Mar 2021 10:39:36 GMT
• Title: Direct approach to realising quantum filters for high-precision measurements
• Authors: Joe Bentley, Hendra Nurdin, Yanbei Chen, and Haixing Miao
• Abstract summary: We find a novel approach to realising quantum filters directly from their frequency-domain transfer functions. It opens a path towards the systematic design of optimal quantum measurement devices.
• Score: 7.454723938034161
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum noise sets a fundamental limit to the sensitivity of high-precision measurements. Suppressing it can be achieved by using non-classical states and quantum filters, which modify both the noise and signal response. We find a novel approach to realising quantum filters directly from their frequency-domain transfer functions, utilising techniques developed by the quantum control community. It not only allows us to construct quantum filters that defy intuition, but also opens a path towards the systematic design of optimal quantum measurement devices. As an illustration, we show a new optical realisation of an active unstable filter with anomalous dispersion, proposed for improving the quantum-limited sensitivity of gravitational-wave detectors.

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