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arXiv:1010.6138 · Physical Review A

Quantum-information transfer with nitrogen-vacancy centers coupled to a whispering-gallery microresonator

Fuli Li, Shaoyan Gao, Fuli Li

Published May 26, 2011• 66 citations
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Abstract

We propose an efficient scheme for the realization of quantum information transfer and entanglement with nitrogen-vacancy (N-$V$) centers coupled to a high-$Q$ whispering-gallery mode (WGM) microresonator. We show that based on the effective dipole-dipole interaction between the N-$V$ centers mediated by the WGM, quantum information can be transferred between the N-$V$ centers through Raman transitions combined with laser fields. This protocol may open up promising possibilities for quantum communications with the solid-state quantum electrodynamic cavity system.

DOI
10.1103/physreva.83.054306

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We propose an efficient scheme for the realization of quantum information transfer and entanglement with nitrogen-vacancy (N-VVV) centers coupled to a high-QQQ whispering-gallery mode (WGM) microresonator. We show that based on the effective dipole-dipole interaction between the N-VVV centers mediated by the WGM, quantum information can be transferred between the N-VVV centers through Raman transitions combined with laser fields. This protocol may open up promising possibilities for quantum communications with the solid-state quantum electrodynamic cavity system.
We theoretically investigate a cavity quantum electrodynamics system in which a high-QQQ whispering-gallery-mode (WGM) microresonator interacts with multiple diamond nanocrystals each containing a single nitrogen-vacancy (NV) center. With a tapered fiber waveguide coupling the WGMs, the transmission spectrum of the system exhibits a twofold-splitting phenomenon, where the first fold of splitting originates from the nanocrystals' Rayleigh scattering and the second fold stems from the NV center dipole coupling with the WGMs. The interacting system can serve as a platform to generate quantum entanglement between two NV centers embedded in distant diamond nanocrystals. Our further study reveals that the Rayleigh scattering of the nanocrystals plays a positive role in generating entanglement in some cases. The analytical results show that the relatively strong scattering leads to a larger concurrence for the fixed dipole-cavity detunings. This investigation may hold potential for solid-state quantum information processing applications.
We present a quantum electrodynamical model involving nitrogen-vacancy centers coupled to a whispering-gallery mode cavity. We consider two schemes to create the W state and Bell state, respectively. One scheme makes use of Raman transition with the cavity field virtually excited, and the other enables Bell state preparation and quantum information transfer by virtue of dark state evolution and adiabatic passage, which is tolerant to ambient noise and experimental parameter fluctuations. We justify our schemes by considering their experimental feasibility and challenge, using the currently available technology.
We present an efficient scheme for the generation of entangled states of two spatially separated nitrogen-vacancy (NV) centers with two whispering-gallery-mode (WGM) microresonators, which are coupled either by an optical fiber-taper waveguide or by the evanescent fields of the WGM. We show that the steady state of the two NV centers can be steered into a singletlike state through a dissipative quantum dynamical process, where the cavity decay plays a positive role and can help drive the system to the target state. The protocol may open up promising perspectives for quantum communication and computation with this solid-state cavity quantum electrodynamic system.
We present a quantum electrodynamical model involving nitrogen-vacancy centers coupled to a whispering-gallery mode cavity. Two schemes are considered to create W state and Bell state, respectively. One of the schemes makes use of the Raman transition with the cavity field virtually excited; The other enables the Bell state preparation and quantum information transfer by virtue of dark state evolution and adiabatic passage, which is tolerant to ambient noise and experimental parameter fluctuations. We justify our schemes by considering the experimental feasibility and challenge using currently available technology.
Abstract We theoretically investigate an efficient scheme for quantum state transfer (QST) between two nitrogen-vacancy (N-V) centers coupled to the whispering gallery modes (WGM) of a micro-resonator. We analyze the impact of mode coupling and the distance between two N-V centers on the dynamics of state transfer. Specifically, we explore QST under three coupling regimes:comparable coupling (J ≃ g), strong mode coupling J ≫ g, and weak mode coupling J ≪ g, also incorporating system decay factors (WGM decay Γ and N-V dephasing γ) at different interparticle distances. Our study shows that by adjusting the system control parameters, quantum information can be transferred between N-V centers with high efficiency. Additionally, the fidelity of QST reaches approximately 99% in all cases, with an oscillatory pattern, reflecting the intricate interplay between NV-resonator and mode coupling strengths. These findings underscore the importance of interparticle distance and mode coupling in the realization of solid-state qubit-based quantum information processing devices.
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.