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Journal of Physics B Atomic Molecular and Optical Physics

Generation of three-dimensional entanglement with spin qubits coupled to a bimodal microsphere cavity

Anshou Zheng, Xiangying Hao, Xin‐You Lü

Published Jul 26, 2011• 6 citations
Publisher

Abstract

An alternative scheme is proposed to generate three-dimensional entanglement with two nitrogen-vacancy (N-V) centres coupled strongly to whispering gallery modes in a silica microsphere. The present scheme takes full advantage of the ultrahigh quality factor of silica microspheres and the exceptional spin properties of N-V centres. Our numerical simulation shows that our scheme is stable to deviation of corresponding experimental parameters and insensitive to decoherence such as the excited state spontaneous emission and cavity decay. In addition, based on the same model, three-dimensional entanglement can be realized by adiabatic evolution of the dark state.

DOI
10.1088/0953-4075/44/16/165507

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An alternative scheme is proposed to generate three-dimensional entanglement with two nitrogen-vacancy (N-V) centres coupled strongly to whispering gallery modes in a silica microsphere. The present scheme takes full advantage of the ultrahigh quality factor of silica microspheres and the exceptional spin properties of N-V centres. Our numerical simulation shows that our scheme is stable to deviation of corresponding experimental parameters and insensitive to decoherence such as the excited state spontaneous emission and cavity decay. In addition, based on the same model, three-dimensional entanglement can be realized by adiabatic evolution of the dark state.
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 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.
We propose a one-step scheme for the generation of Greenberger–Horne–Zeilinger states of multi solid-state qubits and the implementation of quantum phase gates in a system consisting of N spatially separated nitrogen-vacancy centers coupled to the whispering-gallery mode (WGM) of a microsphere cavity. The proposed scheme is based on the effective electronic dipole–dipole interaction between electron spins associated with the NV centers, which is mediated by the WGM and applying external driving laser fields. As the spontaneous emission of the excited states of the NV centers is highly suppressed and the cavity mode is only virtually excited, the scheme is insensitive to decoherence.
A cavity QED implementation of the non-adiabatic holonomic quantum computation in decoherence-free subspaces is proposed with nitrogen-vacancy centers coupled commonly to the whispering-gallery mode of a microsphere cavity, where a universal set of quantum gates can be realized on the qubits. In our implementation, with the assistant of the appropriate driving fields, the quantum evolution is insensitive to the cavity field state, which is only virtually excited. The implemented non-adiabatic holonomies, utilizing optical transitions in the Λ type of three-level configuration of the nitrogen-vacancy centers, can be used to construct a universal set of quantum gates on the encoded logical qubits. Therefore, our scheme opens up the possibility of realizing universal holonomic quantum computation with cavity assisted interaction on solid-state spins characterized by long coherence times.