Please use this identifier to cite or link to this item: 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
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