Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Transport: Quantum Coherence and Quantum Information

TT 44.12: Vortrag

Donnerstag, 26. März 2009, 17:15–17:30, HSZ 304

Cooling a Micro-Mechanical Resonator by Quantum Back-Action from a Noisy Qubit — •Yingdan Wang¹, Yong Li¹, Fei Xue², Kouich Semba³, and Christoph Bruder¹ — ¹Department of Physics, University of Basel, Basel, Switzerland — ²Department of Electrical Engineering, Technion, Haifa, Israel — ³NTT Basic Research Laboratories, Atsugi, Japan

We study the different roles of qubit dephasing and relaxation in the process of cooling a mechanical resonator by quantum back-action. With a superconducting flux qubit as a specific example, we show that ground-state cooling of a mechanical resonator is possible under present experimental conditions. Our investigation suggests that the cooling limit is primarily determined by the dissipative nature of the qubit, including both relaxation and dephasing.