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Q: Fachverband Quantenoptik und Photonik

Q 44: Quanteneffekte (Interferenz / Sonstige)

Q 44.7: Vortrag

Donnerstag, 13. März 2008, 15:30–15:45, 2D

Cooling of a nanomechanical resonator integrated into a superconducting box qubit — •Konstanze Jähne^{1, 2} and Margareta Wallquist^{1, 2} — ¹Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria — ²Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Innsbruck, Austria

We consider the following system: a nanomechanical resonator that is integrated into a superconducting loop of a current-biased superconducting qubit, in particular a Cooper pair box. One can apply a magnetic field to the nanoresonator, which together with the current flowing through it creates a Lorentz force, which gives rise to a switchable coupling between nanoresonator and qubit. Using methods of theoretical quantum optics, we show that it is possible to cool the nanoresonator, if one drives the qubit around its optimal working point with a drive frequency that is red detuned with respect to the qubit transition. Furthermore we investigate under which conditions the nanoresonator can be cooled to its quantum mechanical ground state.