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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: | Sep-2015 | Source: | Physical review. A, Atomic, molecular, and optical physics, Sept. 2015, v. 92, no. 3, 032318 | 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. | Publisher: | American Physical Society | Journal: | Physical review. A, Atomic, molecular, and optical physics | ISSN: | 1050-2947 | EISSN: | 1094-1622 | DOI: | 10.1103/PhysRevA.92.032318 | Rights: | ©2015 American Physical Society The following publication Xiong, W., Jin, D. Y., Jing, J., Lam, C. H., & You, J. Q. (2015). Controllable coupling between a nanomechanical resonator and a coplanar-waveguide resonator via a superconducting flux qubit. Physical Review A, 92(3), 032318 is available at https://doi.org/10.1103/PhysRevA.92.032318. |
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