Abstract
With the local resonant interaction between a nitrogen-vacancy-center ensemble (NVE) and a superconducting coplanar resonator, and the single-qubit operation, we propose two protocols for the state transfer between two remote NVEs and for a fast controlled-phase (cphase) gate on these NVEs, respectively. This hybrid quantum system is composed of two distant NVEs coupled to separated high- transmission line resonators (TLRs), which are interconnected by a current-biased Josephson-junction superconducting phase qubit. The fidelity of our state-transfer protocol is about within the operation time of ns. The fidelity of our cphase gate is about within the operation time of ns. Furthermore, using the cphase gate, we construct a two-dimensional cluster state on NVEs in a square grid based on the hybrid quantum system for the one-way quantum computation. Our protocol may be more robust, compared with the one based on the superconducting resonators, due to the long coherence time of NVEs at room temperature.
- Received 27 February 2015
DOI:https://doi.org/10.1103/PhysRevA.91.062325
©2015 American Physical Society