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Quantum Optics Theory - Rabl Group
Quantum Optics Theory – Rabl Group

Generation of squeezed states of nanomechanical resonators by reservoir engineering

Author(s): P. Rabl, A. Shnirman, P. Zoller

Journal: Phys. Rev. B

Volume: 70

Page(s): 205304

Year: 2004

DOI Number: 10.1103/PhysRevB.70.205304

Link: Link to publication


An experimental demonstration of a nonclassical state of a nanomechanical resonator is still an outstanding task. In this paper we show how the resonator can be cooled and driven into a squeezed state by a bichromatic microwave coupling to a charge qubit. The stationary resonator state exhibits a reduced noise in one of the quadrature components by a factor of 0.5–0.2. These values are obtained for a 100 MHz resonator with a Q-value of 104 to 105 and for support temperatures of T≈25 mK. We show that the coupling to the charge qubit can also be used to detect the squeezed state via measurements of the excited state population. Furthermore, by extending this measurement procedure a complete quantum state tomography of the resonator state can be performed. This provides a universal tool to detect a large variety of different states and to prove the quantum nature of nanomechanical systems.

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