Quantum enhanced distributed phase sensing with a truncated SU(1,1) interferometer

• URL: http://arxiv.org/abs/2403.17119v1
• Date: Mon, 25 Mar 2024 19:00:21 GMT
• Title: Quantum enhanced distributed phase sensing with a truncated SU(1,1) interferometer
• Authors: Seongjin Hong, Matthew A. Feldman, Claire E. Marvinney, Donghwa Lee, Changhyoup Lee, Michael T. Febbraro, Alberto M. Marino, Raphael C. Pooser,
• Abstract summary: A network of entangled sensors can improve sensitivity beyond the shot noise limit, and enable a Heisenberg scaling with the number of sensors. We experimentally demonstrate a quantum noise reduction of 1.7 dB and a classical 3 dB signal-to-noise ratio improvement over the separable sensing approach. Our results pave the way for developing quantum enhanced sensor networks that can achieve an entanglement-enhanced sensitivity.
• Score: 0.44475839286738167
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In recent years, distributed quantum sensing has gained interest for a range of applications requiring networks of sensors, from global-scale clock synchronization to high energy physics. In particular, a network of entangled sensors can improve not only the sensitivity beyond the shot noise limit, but also enable a Heisenberg scaling with the number of sensors. Here, using bright entangled twin beams, we theoretically and experimentally demonstrate the detection of a linear combination of two distributed phases beyond the shot noise limit with a truncated SU(1,1) interferometer. We experimentally demonstrate a quantum noise reduction of 1.7 dB and a classical 3 dB signal-to-noise ratio improvement over the separable sensing approach involving two truncated SU(1,1) interferometers. Additionally, we theoretically extend the use of a truncated SU(1,1) interferometer to a multi-phase-distributed sensing scheme that leverages entanglement as a resource to achieve a quantum improvement in the scaling with the number of sensors in the network. Our results pave the way for developing quantum enhanced sensor networks that can achieve an entanglement-enhanced sensitivity.

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