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Entangled States of Atomic Solitons for Quantum Metrology
摘要： The formation of multiparticle maximally path-entangled states (known as N00N-states) are considered along with their use in quantum metrology. It is shown how the standard quantum limit can be overcome and the Heisenberg limit can be reached when measuring the linear phase shift. It is also shown how the Heisenberg limit can be overcome when measuring the parameters of a medium in nonlinear quantum metrology.
关键词： quantum metrology,Heisenberg limit,Bose–Einstein condensates,standard quantum limit,N00N-states
更新于2025-09-23 15:19:57
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Quantum Measurement of a Mechanical Resonator at and Below the Standard Quantum Limit
摘要： Interferometric techniques to measure mechanical displacement are subject to constraints ultimately governed by quantum mechanics. In a “standard” measurement of a mechanically induced optical phase shift, there exists a trade-off between measurement imprecision and motion disturbance, known as standard quantum limit (SQL). For a mechanical resonator with susceptibility χm(Ω), this limit is SSQL(Ω) = ˉh|χm(Ω)| (ˉh reduced Planck constant), at any frequency Ω. In the last half-century, a number of systems, including advanced LIGO and ultracold atoms have progressed towards this limit, but excess sources of noise have yet prevented fully reaching the SQL. Here, we show measurements of an ultracoherent mechanical resonator performed at the SQL within 33% and, for the ?rst time, below the SQL by 1.5 dB. The latter has been possible by a non-standard measurement scheme that exploits quantum correlations between optical quadratures induced in the optomechanical device.
关键词： Standard Quantum Limit,Optomechanical Device,Quantum Measurement,Mechanical Resonator
更新于2025-09-11 14:15:04