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Bulletin of the American Physical Society

Optimal control of nanomechanical quantum memory coupled to superconducting qubit

Mingyu Kang, Zhaoyou Wang, E. Alex Wollack, Agnetta Y. Cleland, Rachel G. Gruenke, Nathan Lee, Kevin Multani, Marek Pechal, Patricio Arrangoiz-Arriola, Amir H. Safavi‐Naeini

Published Mar 5, 2020• 0 citations
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Abstract We propose a scheme for realizing quadrature squeezing of the mechanical mode in a superconducting electromechanical system, where a nanomechanical resonator (NAMR) is coupled to a superconducting transmission line resonator (STLR) via a superconducting quantum interference device (SQUID), and the SQUID acts as a qubit. Under a large detuning condition, we use the Fröhlich-Nakajima transformation to adiabatically eliminate the qubit and obtain an effective Hamiltonian for the STLR and the NAMR. Our results show that a strong squeezing effect (beyond 3 dB limit) can occur in the NAMR, and the squeezing degree can be optimized by controlling the strength of the driving field and the dissipation ratio of the system. One of the most notable features of our results is the universality, i.e. the results only depend on a few scaled quantities, not on too many parameters.