2008/04/30 by Konstanze Jaehne, Klemens Hammerer, Margareta Wallquist · 1 citation
Materials Science · Physics and Astronomy · #Beam (structure) #Charge qubit #Coupling (piping) #Dissipative system #Force Microscopy Techniques and Applications #Mechanical and Optical Resonators #Mode (computer interface) #Nonlocal and gradient elasticity in micro/nano structures #Qubit #Resolved sideband cooling #Resonator #Voltage #cond-mat.other #quant-ph
paper · pdf · doi:10.1088/1367-2630/10/9/095019
published as New J. Phys. 10 (2008) 095019 · 24 pages, 6 figures, accepted for publication in NJP special issue 'Mechanical Systems at the Quantum Limit'
openalex publication_date 2008/09/01 · arxiv created 2008/09/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.