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.
@article{arxiv.quant-ph/0605017,
title = {Nonlinear coupling of nano mechanical resonators to Josephson quantum circuits},
author = {Xingxiang Zhou and Ari Mizel},
journal= {arXiv preprint arXiv:quant-ph/0605017},
year = {2015}
}