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Productions of Many Atom Entangled States and Their Interferometric Applications

Yi-Quan Zou, Ling-Na Wu, Xinyu Luo, Qi Liu, Meng Khoon Tey, Li You

Published Jan 1, 2018• 0 citations
Publisher

Abstract

Interferometric precision with N uncorrelated particles is bounded by the standard quantum limit (SQL). We report deterministic generations of entangled atomic states as well as their sensing precisions more than 8dB beyond the SQL.
DOI
10.1364/cleopr.2018.f1d.1

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Quantum metrology exploits entangled states of particles to improve sensing precision beyond the limit achievable with uncorrelated particles. All previous methods required detection noise levels below this standard quantum limit to realize the benefits of the intrinsic sensitivity provided by these states. We experimentally demonstrate a widely applicable method for entanglement-enhanced measurements without low-noise detection. The method involves an intermediate quantum phase magnification step that eases implementation complexity. We used it to perform squeezed-state metrology 8 decibels below the standard quantum limit with a detection system that has a noise floor 10 decibels above the standard quantum limit.
High precision interferometers are the building blocks of precision metrology and the ultimate interferometric sensitivity is limited by the quantum noise. Here, we propose and experimentally demonstrate a compact quantum interferometer involving two optical parametric amplifiers and the squeezed states generated within the interferometer are directly used for the phase-sensing quantum state. By both squeezing shot noise and amplifying phase-sensing intensity the sensitivity improvement of 4.86±0.24 dB beyond the standard quantum limit is deterministically realized and a minimum detectable phase smaller than that of all present interferometers under the same phase-sensing intensity is achieved. This interferometric system has significantly potential applications in a variety of measurements for tiny variances of physical quantities.