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  Probing macroscopic quantum states with a sub-Heisenberg accuracy

Miao, H., Danilishin, S., Müller-Ebhardt, H., Rehbein, H., Somiya, K., & Chen, Y. (2010). Probing macroscopic quantum states with a sub-Heisenberg accuracy. Physical Review. A, 81: 012114. doi:10.1103/PhysRevA.81.012114.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-BB51-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-BB55-0
Genre: Journal Article

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0905.3729 (Preprint), 871KB
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 Creators:
Miao, Haixing, Author
Danilishin, Stefan, Author
Müller-Ebhardt, Helge1, Author              
Rehbein, Henning1, Author              
Somiya, Kentaro1, Author              
Chen, Yanbei2, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: Quantum Physics, quant-ph
 Abstract: Significant achievements in the reduction of classical-noise floor will allow macroscopic systems to prepare nearly Heisenberg-Limited quantum states through a continuous measurement, i.e. conditioning. In order to probe the conditional quantum state and confirm quantum dynamics, we propose use of an optimal time-domain variational measurement, in which the homodyne detection phase varies in time. This protocol allows us to characterize the macroscopic quantum state below the Heisenberg Uncertainty -- i.e. Quantum Tomography -- and the only limitation comes from readout loss which enters in a similar manner as the frequency-domain variational scheme proposed by Kimble et al.. In the case of no readout loss, it is identical to the back-action-evading scheme invented by Vyatchanin et al. for detecting gravitational-wave (GW) signal with known arrival time. As a special example and to motivate Macroscopic Quantum Mechanics (MQM) experiments with future GW detectors, we mostly focus on the free-mass limit -- the characteristic measurement frequency is much higher than the oscillator frequency -- and further assume the classical noises are Markovian, which captures the main feature of a broadband GW detector. Besides, we consider verifications of Einstein-Podolsky-Rosen (EPR) type entanglements between macroscopic test masses in GW detectors, which enables to test one particular version of Gravity Decoherence conjectured by Diosi and Penrose.

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 Dates: 2009-05-222010-02-232010
 Publication Status: Published in print
 Pages: 13 pages, 7 figures
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 Rev. Method: -
 Identifiers: arXiv: 0905.3729
DOI: 10.1103/PhysRevA.81.012114
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Title: Physical Review. A
  Alternative Title : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : Published by the American Physical Society through the American Institute of Physics
Pages: - Volume / Issue: 81 Sequence Number: 012114 Start / End Page: - Identifier: Other: 954925225012
Other: 1050-2947