Protection of noise squeezing in a quantum interferometer with optimal resource allocation

• URL: http://arxiv.org/abs/2208.08316v1
• Date: Wed, 17 Aug 2022 14:29:28 GMT
• Title: Protection of noise squeezing in a quantum interferometer with optimal resource allocation
• Authors: Wenfeng Huang, Xinyun Liang, Baiqiang Zhu, Yuhan Yan, Chun-Hua Yuan, Weiping Zhang, Liqing Chen
• Abstract summary: Interferometers are crucial for precision measurements, including gravitational wave, laser, radar and imaging. We design and demonstrate a quantum interferometer utilizing a beamsplitter with variable splitting ratio to protect quantum resource against environmental impacts. This strategy could open a way to retain quantum advantages for quantum information processing and quantum precision measurement in lossy environments.
• Score: 0.46180371154032895
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Interferometers are crucial for precision measurements, including gravitational wave, laser ranging, radar and imaging. The phase sensitivity, the core parameter, can be quantum-enhanced to break the standard quantum limit (SQL) using quantum states. However, quantum states are highly fragile to and quickly degrade with losses. We design and demonstrate a quantum interferometer utilizing a beamsplitter with variable splitting ratio to protect the quantum resource against environmental impacts. The optimal phase sensitivity can reach the quantum Cram\'{e}r-Rao bound of the system. This quantum interferometer can greatly reduce the quantum source requirements in quantum measurements. In theory, with a 66.6% loss rate, the sensitivity can break the SQL using only a 6.0 dB squeezed quantum resource with current interferometer, rather than a 24 dB squeezed quantum resource with a conventional squeezing-vacuum-injected Mach-Zehnder interferometer. In experiments, when using a 2.0 dB squeezed vacuum state, the sensitivity can be enhanced by 1.6 dB when the loss rate of one arm is as high as 95%, indicating that the quantum resource is excellently protected with the existence of losses in practical applications. This strategy could open a way to retain quantum advantages for quantum information processing and quantum precision measurement in lossy environments.

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