Ground state cooling of a nanomechanical resonator via a Cooper pair box qubit
Abstract
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.
Keywords
Cite
@article{arxiv.0804.0603,
title = {Ground state cooling of a nanomechanical resonator via a Cooper pair box qubit},
author = {Konstanze Jaehne and Klemens Hammerer and Margareta Wallquist},
journal= {arXiv preprint arXiv:0804.0603},
year = {2008}
}
Comments
24 pages, 6 figures, accepted for publication in NJP special issue 'Mechanical Systems at the Quantum Limit'