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

Wang, Chuan; Cao, Cong; Tong, Xin; Mi, Sichen; Shen, Wei-Wei; Wang, Zhihui

doi:10.1088/1054-660x/24/10/105204

Cited by 7 publications

(5 citation statements)

References 36 publications

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“…Third, our ECP does not require that the coefficients of the initial less-entangled state are known to the parties, different from the ECPs in [68,71]. Moreover, our ECP can output maximally entangled states between two space-like separated NV centers without initial entanglement or direct interaction between them, which can increase greatly the efficiency of the entanglement swapping in practical quantum repeaters [77].…”

Section: Discussion and Summarymentioning

confidence: 99%

Entanglement concentration of unknown states on separate nitrogen-vacancy centers via error-detected entanglement swapping

et al. 2017

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Here we propose a new entanglement concentration protocol (ECP) for unknown lessentangled states on separate nitrogen-vacancy (NV) centers. The protocol exploits the errordetected 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.

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Section: Discussion and Summarymentioning

confidence: 99%

Entanglement concentration of unknown states on separate nitrogen-vacancy centers via error-detected entanglement swapping

et al. 2017

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“…(The degree of a node is defined to be the number of edges connected to that node.) Several different platforms have been considered for quantum memories in quantum repeater networks, such as trapped ions [46], Rydberg atoms [47,48], atom-cavity systems [49,50], NV centers in diamond [43,[51][52][53][54][55], individual rare-earth ions in crystals [56], and superconducting processors [57].…”

Section: Network Architectures and Entanglement Distribution Protocolsmentioning

confidence: 99%

Practical figures of merit and thresholds for entanglement distribution in quantum networks

Khatri

Matyas

Siddiqui

et al. 2019

Phys. Rev. Research

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Before global-scale quantum networks become operational, it is important to consider how to evaluate their performance so that they can be suitably built to achieve the desired performance. In this work, we consider three figures of merit for the performance of a quantum network: the average global connection time, the average point-to-point connection time, and the average largest entanglement cluster size. These three quantities are based on the generation of elementary links in a quantum network, which is a crucial initial requirement that must be met before any long-range entanglement distribution can be achieved. We evaluate these figures of merit for a particular class of quantum repeater protocols consisting of repeat-until-success elementary link generation along with entanglement swapping at intermediate nodes in order to achieve long-range entanglement. We obtain lower and upper bounds on these three quantities, which lead to requirements on quantum memory coherence times and other aspects of quantum network implementations. Our bounds are based solely on the inherently probabilistic nature of elementary link generation in quantum networks, and they apply to networks with arbitrary topology. CONTENTS

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“…Now, as mentioned above, once the heralding procedure succeeds, the nodes store their quantum systems in their local quantum memory. Quantum memories have been made using trapped ions [127], Rydberg atoms [128,129], atom-cavity systems [130,131], NV centers in diamond [98,99,[132][133][134][135], individual rare-earth ions in crystals [136], and superconducting processors [137]. The quantum memories are in general imperfect, which means that the quantum systems decohere over time.…”

Section: Elementary Link Generationmentioning

confidence: 99%

Policies for elementary links in a quantum network

Khatri

2020

Preprint

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Protocols in a quantum network involve multiple parties performing actions on their quantum systems in a carefully orchestrated manner over time in order to accomplish a given task. This sequence of actions over time is often referred to as a strategy, or policy. In this work, we consider policy optimization in a quantum network. Specifically, as a first step towards developing full-fledged quantum network protocols, we consider policies for generating elementary links in a quantum network. We start by casting elementary link generation as a quantum partially observable Markov decision process, as defined in [Phys. Rev. A 90, 032311 (2014)]. Then, we analyze in detail the commonly used memory cutoff policy. Under this policy, once a link is established it is kept in quantum memory for some amount t of time, called the cutoff, before it is discarded and link generation is reattempted. For this policy, we determine the average quantum state of the elementary link as a function of time for an arbitrary number of nodes in the link, as well as the average fidelity of the link as a function of time for any noise model for the quantum memories. We then show how optimal policies can be obtained in the finite-horizon setting using dynamic programming.

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

Cited by 7 publications

References 36 publications

Entanglement concentration of unknown states on separate nitrogen-vacancy centers via error-detected entanglement swapping

Entanglement concentration of unknown states on separate nitrogen-vacancy centers via error-detected entanglement swapping

Practical figures of merit and thresholds for entanglement distribution in quantum networks

Policies for elementary links in a quantum network

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