Wednesday, April 10, 2013

1304.2459 (Keye Zhang et al.)

Quantum-mechanics-free subsystem in a condensate-based optomechanical

Keye Zhang, Pierre Meystre, Weiping Zhang
We propose a quantum optomechanical implementation of the quantum mechanics free subsystem (QMFS) proposed by Tsang and Caves [Phys. Rev. Lett. 105, 123601 (2010); Phys. Rev. X 2, 031016 (2012)] based on the mechanical properties of a Bose-Einstein condensate trapped in an optical lattice. In that scheme the effective mass of the atomic condensate is modulated by an optical lattice and can become negative, resulting in a negative-frequency optomechanical oscillator, negative environment temperature, and optomechanical properties opposite to those of a positive mass system. We also discuss possible protocols to apply this scheme to the back-action evading measurement of feeble fields.
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