| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Squeezing Effect of a Nanomechanical Resonator Coupled to a Two-Level System: an Equilibrium Approach |
| LI Jing, CHEN Zhi-De |
| Department of Physics, Jinan University, Guangzhou 510632 |
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| Cite this article: |
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LI Jing, CHEN Zhi-De 2009 Chin. Phys. Lett. 26 038501 |
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Abstract The squeezing effect of a nanomechanical resonator coupled to a two-level system is studied by variational calculations based on both the displaced-squeezed-state (DSS) and the displaced-oscillator-state (DOS). The stable region of the DSS ground state at both T=0 and T≠0 and the corresponding squeezing factor are calculated. It is found that when the resonator frequency lies in (kBT,Δ), where Δ is the tunnelling splitting of the two-level-system in the presence of dissipation, tunnelling splitting of a DSS ground state decreases with the temperature, while tunnelling splitting of a DOS ground state increases with the temperature in low temperature region. This opposite temperature dependence can help to distinguish between the DSS and DOS ground state in the experiment.
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| Keywords:
85.85.+j
85.35.Gv
42.50.Dv
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Received: 19 November 2008
Published: 19 February 2009
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| PACS: |
85.85.+j
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(Micro- and nano-electromechanical systems (MEMS/NEMS) and devices)
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85.35.Gv
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(Single electron devices)
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42.50.Dv
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(Quantum state engineering and measurements)
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