Konstanze Jaehne et al 2008 New J. Phys. 10 095019 doi:10.1088/1367-2630/10/9/095019
Ground-state cooling of a nanomechanical resonator via a Cooper-pair box qubit
Focus on Mechanical Systems at the Quantum LimitKonstanze Jaehne1,2,3, Klemens Hammerer1,2 and Margareta Wallquist1,2
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In this paper, we present a scheme for ground-state cooling of a flexural mode of a nanomechanical beam incorporated in a loop-shaped Cooper-pair box (CPB) circuit. Via the Lorentz force coupling of the beam motion to circulating CPB-circuit currents, energy is transferred to the CPB qubit which acts as a dissipative two-level system. The cooling process is driven by a detuned gate voltage drive acting on the CPB. We analyze the cooling force spectrum and present analytical expressions for the cooling rate and final occupation number for a wide parameter regime. In particular, we find that cooling is optimized in a strong drive regime, and we present the necessary conditions for ground-state cooling.
- PACS
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
- Subjects
- Dates
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Issue 9 (September 2008)
Received 3 April 2008
Published 30 September 2008
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Ground-state cooling of a nanomechanical resonator via a Cooper-pair box qubit
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