Nonlinear coupling of nano mechanical resonators to Josephson quantum circuits

Details Nonlinear coupling of nano mechanical resonators to Josephson quantum circuits Nonlinear coupling of nano mechanical resonators to Josephson quantum circuits

2006-05-01

arxiv.org/abs/quant-ph/0605017v1

Physics

Quantum Physics

Scientific paper

We propose a technique to couple the position operator of a nano mechanical resonator to a SQUID device by modulating its magnetic flux bias. By tuning the magnetic field properly, either linear or quadratic couplings can be realized, with a discretely adjustable coupling strength. This provides a way to realize coherent nonlinear effects in a nano mechanical resonator by coupling it to a Josephson quantum circuit. As an example, we show how squeezing of the nano mechanical resonator state can be realized with this technique. We also propose a simple method to measure the uncertainty in the position of the nano mechanical resonator without quantum state tomography.

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