title: Achieving maximum entanglement between two nitrogen-vacancy centers coupling to a whispering-gallery-mode microresonator.
abstract: We investigate the entanglement generation between two nitrogen-vacancy (NV) centers in diamond nanocrystal coupled to a high-Q counterpropagating twin whispering-gallery modes (WGMs) of a microtoroidal resonator. For looking into the degree and dynamics of the entanglement, we calculate the concurrence using the microscopic master equation approach. The influences of the coupling strength between the WGMs (or the size of the two spherical NV centers), the distance between two NV centers, the frequency detuning between the NV center and microresonator, and the initial state of the system on the dynamics of concurrence are discussed in detail. It is found that the maximum entanglement between the two NV centers can be created by properly adjusting these controllable system parameters. Our results may provide further insight into future solid-state cavity quantum electrodynamics (CQED) system for quantum information engineering.
authors.affiliation: Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Siping
authors.initials: S
authors.lastname: Liu
authors.forename: Jiahua
authors.initials: J
authors.lastname: Li
authors.forename: Rong
authors.initials: R
authors.lastname: Yu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008904:Miniaturization; D008956:Models, Chemical; D009584:Nitrogen / Q000737:chemistry*; D011789:Quantum Theory; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers
chemical_list: D009584:Nitrogen