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Laser Physics

Implementation of quantum repeaters based on nitrogen-vacancy centers via coupling to microtoroid resonators

Chuan Xi Wang, Cong Cao, Xin Tong, Sichen Mi, Wei-Wei Shen, Tie-Jun Wang

Published Aug 13, 2014• 9 citations
Publisher

Abstract

We investigate a hybrid entanglement distribution protocol based upon nitrogen vacancy centers and microtoroid resonators. The protocol is based on the input–output relation on the nitrogen-vacancy center and microresonator coupling, and the entanglement can be distributed between photons and solid state qubits with the assistance of microcavity resonance. The protocol can be further generalized to quantum repeaters by introducing entanglement purification and entanglement swapping. As solid state systems are promising candidates for long distance quantum communication, the proposed protocol enables the distant parties to achieve scalable distribution of entanglement. We also discussed the practical performance and possible experimental realizations.

DOI
10.1088/1054-660x/24/10/105204

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We investigate a hybrid entanglement distribution protocol based upon nitrogen vacancy centers and microtoroid resonators. The protocol is based on the input–output relation on the nitrogen-vacancy center and microresonator coupling, and the entanglement can be distributed between photons and solid state qubits with the assistance of microcavity resonance. The protocol can be further generalized to quantum repeaters by introducing entanglement purification and entanglement swapping. As solid state systems are promising candidates for long distance quantum communication, the proposed protocol enables the distant parties to achieve scalable distribution of entanglement. We also discussed the practical performance and possible experimental realizations.
We investigate a candidate for the potential implementation of entanglement purification of two entangled nitrogen vacancy (N-V) centers that are coupled with two microtoroidal resonators. In our proposed entanglement purification protocol (EPP), mixed entangled ensembles can be purified with the local parity-check operations. With current and near-future technology, we can achieve the maximally entangled N-V centers nonlocally. And our EPP can be used in quantum repeaters for long-distance quantum communication.
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 demonstrate efficient schemes of deterministic entanglement generation and quantum state transfer (QST) with the nitrogen-vacancy (NV) centers in diamond confined in separated microtoroidal resonators via single-photon input-output process. Assisted by the polarization of input photon pulse and the electron spin state of NV center, high fidelity NV center entangled states and photonic entangled states can be generated, respectively. The analyses of experimental feasibility show that our schemes work well with low quality resonators and weak coupling between qubits, which may be beneficial for exploring large-scale quantum information processing with diamond-based solid-state devices.
Quantum entanglement is a key resource in quantum information processing. In this paper, we propose a scheme for preparing a cluster entangled state by means of multiple nitrogen vacancy centers and microtoroidal resonator coupled systems. The scheme employs an input–output process and single-photon interference, without any other auxiliary entanglement particles or classical communication. Considering the current experimental technology, the scheme will be implemented and has an important role in the preparation of cluster entangled state by means of nitrogen vacancy centers and microtoroidal resonator coupled systems.
Here we propose two practical protocols to concentrate entanglement between separate nitrogen-vacancy (N-V) centers in less entangled state via coupling to microtoroidal resonators. We construct the parity check gate of the N-V center and microtoroidal resonator systems via the interaction with the ancillary photon input-output process near the microtoroidal resonators. Thus the parity of the N-V center state can be readout by the measurement on the ancillary photon. Then we introduce the parity check operations to entanglement concentration protocols. Considering current techniques, we also discuss the feasibility of our proposal and its experimental challenges.