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Optics Express

Concentration of entangled nitrogen-vacancy centers in decoherence free subspace

Chuan Xi Wang, Tie-Jun Wang, Yong Zhang, Rongzhen Jiao, Guang-Sheng Jin

Published Jan 15, 2014• 22 citations
Publisher

Abstract

Exploiting the input-output process of low-Q cavities confining nitrogen-vacancy centers, we present an efficient entanglement concentration protocol on electron spin state in decoherence free subspace. Less entangled state can be concentrated to maximally entangled state with the assistance of single photon detection. With its robustness and scalability, the present protocol is immune to dephasing and can be further applied to quantum repeaters and distributed quantum computation.

DOI
10.1364/oe.22.001551

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Exploiting the input-output process of low-Q cavities confining nitrogen-vacancy centers, we present an efficient entanglement concentration protocol on electron spin state in decoherence free subspace. Less entangled state can be concentrated to maximally entangled state with the assistance of single photon detection. With its robustness and scalability, the present protocol is immune to dephasing and can be further applied to quantum repeaters and distributed quantum computation.
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Abstract Here we propose a new entanglement concentration protocol (ECP) for unknown less-entangled states on separate nitrogen-vacancy (NV) centers. The protocol exploits the error-detected entanglement swapping based on cavity quantum electrodynamics, which is more robust and practical than previous ECPs for NV centers. We present in detail the principle and the advantages of the ECP. Also, the performance of the protocol with current experimental parameters is discussed. We believe that the ECP could provide a promising building block for solid-state quantum repeaters and quantum networks in the future.
We describe a high efcient entanglement concentration protocol(ECP) for multi-particle less-entangled nitrogen-vacancy(N-V)center and microtoroidal resonator system. In the ECP, we only require one pair of less-entangled state, two auxiliary N-V center in microcavities and some single photons. After the photon passing through the microcavity, by measuring the polarization of the photon,a maximally entangled W state can be obtained with some success probability. This ECP does not need to destroy the solid qubit,which makes it more feasible. Moreover, by resorting to more single photons, it can be repeated to reach a high success probability.These features make this ECP useful in current long-distance quantum communications.
We describe a high efcient entanglement concentration protocol(ECP)for multi-particle less-entangled nitrogen-vacancy(N-V)center and microtoroidal resonator system.In the ECP,we only require one pair of less-entangled state,two auxiliary N-V center in microcavities and some single photons.After the photon passing through the microcavity,by measuring the polarization of the photon,a maximally entangled W state can be obtained with some success probability.This ECP does not need to destroy the solid qubit,which makes it more feasible.Moreover,by resorting to more single photons,it can be repeated to reach a high success probability.These features make this ECP useful in current long-distance quantum communications.
We propose an entanglement concentration protocol (ECP) for spatially separated negatively charged nitrogen-vacancy (N-V) centers in a partially entangled W state, resorting to a hybrid quantum circuit and some ancillary single photons. The hybrid quantum circuit is composed of a single N-V center coupled on the periphery of a microtoroidal resonator and linear-optical elements. Exploiting currently available techniques (for example, the single-photon input–output process), the standard maximally entangled W state could be distilled from the initial partially entangled W state. Compared with other ECPs for W-class states, we discuss the advantages of the present protocol. Further, the feasibility and the experimental challenges of the protocol are discussed by considering currently available techniques.
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