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Published February 13, 2013 | Submitted
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Quantum-state steering in optomechanical devices

Abstract

We show that optomechanical systems in the quantum regime can be used to demonstrate EPR-type quantum entanglement between the optical field and the mechanical oscillator, via quantum-state steering. Namely, the conditional quantum state of the mechanical oscillator can be steered into different quantum states depending the choice made on which quadrature of the out-going field is to be measured via homodyne detection. More specifically, if quantum radiation pressure force dominates over thermal force, the oscillator's quantum state is steerable with a photodetection efficiency as low as 50%, approaching the ideal limit shown by Wiseman and Gambetta [Phys. Rev. Lett. 108, 220402 (2012)]. We also show that requirement for steerability is the same as those for achieving sub-Heisenberg state tomography using the same experimental setup.

Additional Information

Imported from arXiv. Acknowledgments. We thank all the members of the AEI Caltech- MIT MQM group for fruitful discussions. This research is supported by the Alexander von Humboldt Foundation's Sofja Kovalevskaja Programme, NSF grants PHY- 0956189 and PHY-1068881, the David and Barbara Groce startup fund at Caltech, as well as the Institute for Quantum Information and Matter, a Physics Frontier Center with funding from the National Science Foundation and the Gordon and Betty Moore Foundation.

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