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https://doi.org/10.1103/PhysRevA.93.042121
Title: | Spectrum analysis with quantum dynamical systems | Authors: | Ng, Shilin Ang, Shan Zheng Wheatley, Trevor A Yonezawa, Hidehiro Furusawa, Akira Huntington, Elanor H Tsang, Mankei |
Keywords: | Science & Technology Physical Sciences Optics Physics, Atomic, Molecular & Chemical Physics LIMIT |
Issue Date: | 27-Apr-2016 | Publisher: | AMER PHYSICAL SOC | Citation: | Ng, Shilin, Ang, Shan Zheng, Wheatley, Trevor A, Yonezawa, Hidehiro, Furusawa, Akira, Huntington, Elanor H, Tsang, Mankei (2016-04-27). Spectrum analysis with quantum dynamical systems. PHYSICAL REVIEW A 93 (4). ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.93.042121 | Abstract: | Measuring the power spectral density of a stochastic process, such as a stochastic force or magnetic field, is a fundamental task in many sensing applications. Quantum noise is becoming a major limiting factor to such a task in future technology, especially in optomechanics for temperature, stochastic gravitational wave, and decoherence measurements. Motivated by this concern, here we prove a measurement-independent quantum limit to the accuracy of estimating the spectrum parameters of a classical stochastic process coupled to a quantum dynamical system. We demonstrate our results by analyzing the data from a continuous-optical-phase-estimation experiment and showing that the experimental performance with homodyne detection is close to the quantum limit. We further propose a spectral photon-counting method that can attain quantum-optimal performance for weak modulation and a coherent-state input, with an error scaling superior to that of homodyne detection at low signal-to-noise ratios. | Source Title: | PHYSICAL REVIEW A | URI: | https://scholarbank.nus.edu.sg/handle/10635/194451 | ISSN: | 24699926 24699934 |
DOI: | 10.1103/PhysRevA.93.042121 |
Appears in Collections: | Staff Publications Elements |
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1603.02137v1.pdf | Accepted version | 699.72 kB | Adobe PDF | OPEN | Post-print | View/Download |
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