Cooling and squeezing the fluctuations of a nanomechanical beam by indirect quantum feedback control

Details Cooling and squeezing the fluctuations of a nanomechanical beam by indirect quantum feedback control Cooling and squeezing the fluctuations of a nanomechanical beam by indirect quantum feedback control

2009-02-15

arxiv.org/abs/0902.2526v1

Phys. Rev. A 79, 052102 (2009)

Physics

Quantum Physics

14 pages, 9 figures

Scientific paper

10.1103/PhysRevA.79.052102

We study cooling and squeezing the fluctuations of a nanomechanical beam using quantum feedback control. In our model, the nanomechanical beam is coupled to a transmission line resonator via a superconducting quantum interference device (SQUID). The leakage of the electromagnetic field from the transmission line resonator is measured using homodyne detection. This measured signal is then used to design a quantum-feedback-control signal to drive the electromagnetic field in the transmission line resonator. Although the control is imposed on the transmission line resonator, this quantum-feedback-control signal indirectly affects the thermal motion of the nanomechanical beam via the inductive beam-resonator coupling, making it possible to cool and squeeze the fluctuations of the beam, allowing it to approach the standard quantum limit.

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