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Physical Review A

Entangling separate nitrogen-vacancy centers in a scalable fashion via coupling to microtoroidal resonators

Qiong Chen, Wanli Yang, Mang Feng, Jiangfeng Du

Published May 23, 2011• 130 citations
Publisher

Abstract

We propose a potentially practical scheme to entangle negatively charged nitrogen-vacancy (N-$V$) centers in distant diamonds. Each diamond is supposed to be fixed on the exterior surface of a microtoroidal resonator, and the single-photon input-output process---a currently available technique---could entangle separate N-$V$ centers in a scalable fashion. The feasibility of our scheme and the experimental challenge are discussed by considering currently available techniques for qualified N-$V$ centers and cavities.

DOI
10.1103/physreva.83.054305

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We propose a potentially practical scheme to entangle negatively charged nitrogen-vacancy (N-VVV) centers in distant diamonds. Each diamond is supposed to be fixed on the exterior surface of a microtoroidal resonator, and the single-photon input-output process---a currently available technique---could entangle separate N-VVV centers in a scalable fashion. The feasibility of our scheme and the experimental challenge are discussed by considering currently available techniques for qualified N-VVV centers and cavities.
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.
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.
We present a practical scheme by global addressing to deterministically entangle negatively charged nitrogen-vacancy (N-V)(\text{N-}V)(N-V) centers in distant diamonds using a nanomechanical cantilever with the magnetic tips strongly coupled to the N-V\text{N-}VN-V electron spins. Symmetric Dicke states are generated as an example, and the experimental feasibility and challenge of our scheme are discussed.
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 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.