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Achieving ground state and enhancing optomechanical entanglement by recovering information

Miao, Haixing and Danilishin, Stefan and Müller-Ebhardt, Helge and Chen, Yanbei (2010) Achieving ground state and enhancing optomechanical entanglement by recovering information. New Journal of Physics, 12 (8). Art. No. 083032. ISSN 1367-2630.

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For cavity-assisted optomechanical cooling experiments, in order to achieve the quantum ground state of the mechanical oscillator, the cavity bandwidth needs to be smaller than the mechanical frequency. In the literature, this is the so-called resolved-sideband or good-cavity limit, and this is based on an understanding of optomechanical dynamics. We provide a different but physically equivalent explanation of such a limit: that is, information loss due to finite cavity bandwidth. With an optimal feedback control to recover the information in the cavity output, we can surpass the resolved-sideband limit and achieve the quantum ground state. In addition, recovering this information can also significantly enhance the entanglement between the cavity mode and the mechanical oscillator. Especially when the environmental temperature is high, such optomechanical entanglement will either exist or vanish critically depending on whether information is recovered or not. This provides a vivid example of a quantum eraser in the optomechanical system.

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Chen, Yanbei0000-0002-9730-9463
Additional Information:© 2010 IOP. Issue 8 (August 2010; received 21 March 2010; published 12 August 2010. We thank T Corbitt, F Ya Khalili, H Rehbein and our colleagues at TAPIR and the MQM group for fruitful discussions. HM is supported by the Australian Research Council and the Department of Education, Science and Training. SD, HM-E and YC are supported by the Alexander von Humboldt Foundation’s Sofja Kovalevskaja program, NSF grants PHY-0653653 and PHY-0601459, as well as the David and Barbara Groce startup fund at Caltech. HM thanks D G Blair, L Ju and C Zhao for their keen support of his visit to Caltech.
Funding AgencyGrant Number
Australian Research CouncilUNSPECIFIED
Australia Department of Education, Science and TrainingUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
David and Barbara Groce startup fund, CaltechUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20100913-100237705
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Official Citation:Haixing Miao et al 2010 New J. Phys. 12 083032 doi: 10.1088/1367-2630/12/8/083032
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19899
Deposited By: Jason Perez
Deposited On:16 Sep 2010 21:35
Last Modified:09 Mar 2020 13:18

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