Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43974
Title: Controllable coupling between a nanomechanical resonator and a coplanar-waveguide resonator via a superconducting flux qubit
Authors: Xiong, W
Jin, DY
Jing, J
Lam, CH 
You, JQ
Issue Date: 2015
Publisher: American Physical Society
Source: Physical review. A, Atomic, molecular, and optical physics, 2015, v. 92, no. 3, 032318 How to cite?
Journal: Physical review. A, Atomic, molecular, and optical physics 
Abstract: We study a tripartite quantum system consisting of a coplanar-waveguide (CPW) resonator and a nanomechanical resonator (NAMR) connected by a flux qubit, where the flux qubit has a large detuning from both resonators. By a unitary transformation and a second-order approximation, we obtain a strong and controllable (i.e., magnetic-field-dependent) effective coupling between the NAMR and the CPW resonator. Due to the strong coupling, vacuum Rabi splitting can be observed from the voltage-fluctuation spectrum of the CPW resonator. We further study the properties of single-photon transport as inferred from the reflectance or equivalently the transmittance. We show that the reflectance and the corresponding phase-shift spectra both exhibit doublet of narrow spectral features due to vacuum Rabi splitting. By tuning the external magnetic field, the reflectance and the phase shift can be varied from 0 to 1 and -π to π, respectively. The results indicate that this hybrid quantum system can act as a quantum router.
URI: http://hdl.handle.net/10397/43974
ISSN: 1050-2947 (print)
1094-1622 (online)
DOI: 10.1103/PhysRevA.92.032318
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