Ground state cooling of a nanomechanical resonator via a Cooper pair box qubit

Details Ground state cooling of a nanomechanical resonator via a Cooper pair box qubit Ground state cooling of a nanomechanical resonator via a Cooper pair box qubit

2008-04-03

arxiv.org/abs/0804.0603v2

New J. Phys. 10 (2008) 095019

Physics

Condensed Matter

Other Condensed Matter

24 pages, 6 figures, accepted for publication in NJP special issue 'Mechanical Systems at the Quantum Limit'

Scientific paper

10.1088/1367-2630/10/9/095019

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.

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