Quantum Repeaters with Encoding on Nitrogen-Vacancy-Center Platforms

Jing, Yumang; Razavi, Mohsen

doi:10.1103/physrevapplied.18.024041

Cited by 3 publications

(4 citation statements)

References 66 publications

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“…Examples of repeater protocols where swapping is only performed after all links are present are schemes that use error correction to protect against operational errors in the repeater nodes [125], such as the ones studied for NV centers in Ref. [126]. In Ref.…”

Section: Discussionmentioning

confidence: 99%

“…In Ref. [126], it is remarked that accounting for depolarizing noise in individual memories is no easy task, and the authors instead assume each qubit decoheres an amount of time equal to the average waiting time. In contrast, our techniques, although approximate, do account for the depolarizing noise in each individual qubit.…”

Section: Discussionmentioning

confidence: 99%

“…A similar approach to Ref. [126] is taken in Ref. [77], where the case of all swaps occurring only in the end is considered to calculate analytical bounds on the decoherence suffered when swaps are performed earlier.…”

Section: Discussionmentioning

confidence: 99%

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Analysis of multipartite entanglement distribution using a central quantum-network node

2023

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We study the performance (rate and fidelity) of distributing multipartite entangled states in a quantum network through the use of a central node. Specifically, we consider the scenario where the multipartite entangled state is first prepared locally at a central node and then transmitted to the end nodes of the network through quantum teleportation. As our first result, we present leading-order analytical expressions and lower bounds for both the rate and fidelity at which a specific class of multipartite entangled states, namely, Greenberger-Horne-Zeilinger (GHZ) states, are distributed. Our analytical expressions for the fidelity accurately account for time-dependent depolarizing noise encountered by individual quantum bits while stored in quantum memory, as verified using Monte Carlo simulations. As our second result, we compare the performance to the case where the central node is an entanglement switch and the GHZ state is created by the end nodes in a distributed fashion. Apart from these two results, we outline how the teleportation-based scheme could be physically implemented using trapped ions or nitrogen-vacancy centers in diamond.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Analysis of multipartite entanglement distribution using a central quantum-network node

2023

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“…[1] Qubit, as the fundamental unit of quantum computing, determines the development of quantum computers. It is known that there are several potential qubit sources, including defects in solids, [2] quantum dots, [3] trapped ions, [4] superconducting circuits, [5] electron spins, [6] etc. All molecular magnetic complexes containing electron spins, which provide great resources for searching spin-based qubits.…”

Section: Introductionmentioning

confidence: 99%

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Wang,

Jing,

Cui

et al. 2023

Chemistry A European J

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Qubits are the basic unit of quantum information and computation. To realize quantum computing and information processing, the decoherence times of qubits must be long enough. Among the studies of molecule‐based electron spin qubits, most of the work focused on the ions with the spin S=1/2, where only single‐bit gates can be constructed. However, quantum operations require the qubits to interact with each other, so people gradually carry out relevant research in ions or systems with S>1/2 and multilevel states. In this work, a two‐dimensional (2D) oxygen‐coordinated GdIIINaI‐based oxamato supramolecular coordination framework, Na[Gd(4‐HOpa)4(H2O)] ⋅ 2H2O (1, 4‐HOpa=N‐4‐hydroxyphenyloxamate), was selected as a possible carrier of qubit. The field‐induced slow magnetic relaxation shows this system has phonon bottleneck (PB) effect at low temperatures with a very weak magnetic anisotropy. The pulse electron paramagnetic resonance studies show the spin‐lattice and spin‐spin relaxation times are T1=1.66 ms at 4 K and Tm=4.25 μs at 8 K for its diamagnetically diluted sample (1Gd0.12 %). It suggested that the relatively long decoherence time is mainly ascribed to its near isotropic and the PB effect from resonance phonon trapped for pure sample, while the dilution further improves its qubit performance.

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Toward radiative-limited coherence of erbium dopants in a nanophotonic resonator

Yang,

Wang,

Tang

2023

Applied Physics Letters

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Atomic-like emitters in the solid state serve as important resources in the advancement of future quantum networks. In particular, intra-4f optical transitions of rare earth ions exhibit excellent coherence properties thanks to the shielding effect of outer electrons. Still, the presence of various dephasing channels in solid state hosts introduces additional decoherence beyond the radiative decay, causing the coherence time of most rare earth doped materials to be over an order of magnitude lower than the radiative limit. Such obstacle prevents the emission of indistinguishable photons from rare earth ions, which is an essential requirement for various quantum applications. In this work, we perform optical coherence study on erbium ions doped in thin-film lithium niobate by patterning photonic crystal resonators with quality factor around 100 k and sub-λ3 mode volume. Leveraging the combination of long coherence and strong Purcell enhancement in the cavity, we show that the coherence time measured with photon echo approaches the radiative limit (80%), representing a 50-fold improvement compared to the waveguide case. Our results present promising prospects toward utilizing rare earth doped materials as quantum repeaters and sources of indistinguishable photons.

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Quantum Repeaters with Encoding on Nitrogen-Vacancy-Center Platforms

Abstract: This is a repository copy of Quantum Repeaters with Encoding on Nitrogen-Vacancy-Center Platforms.

Cited by 3 publications

References 66 publications

Analysis of multipartite entanglement distribution using a central quantum-network node

Analysis of multipartite entanglement distribution using a central quantum-network node

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Toward radiative-limited coherence of erbium dopants in a nanophotonic resonator

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Quantum Repeaters with Encoding on Nitrogen-Vacancy-Center Platforms

Abstract: This is a repository copy of Quantum Repeaters with Encoding on Nitrogen-Vacancy-Center Platforms.

Cited by 3 publications

References 66 publications

Analysis of multipartite entanglement distribution using a central quantum-network node

Analysis of multipartite entanglement distribution using a central quantum-network node

Spin Qubit in a 2D GdIIINaI‐Based Oxamato Supramolecular Coordination Framework

Toward radiative-limited coherence of erbium dopants in a nanophotonic resonator

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Product

Resources

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Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework