Entanglement of dark electron-nuclear spin defects in diamond

Degen, Maarten; Loenen, S. J. H.; Bartling, H. P.; Bradley, C. E.; Meinsma, Aletta; Markham, Matthew; Twitchen, Daniel J.; Taminiau, T. H.

doi:10.1038/s41467-021-23454-9

Cited by 34 publications

(18 citation statements)

References 70 publications

(78 reference statements)

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“…from the high concentration of P1 centre impurities in this specific device (~75 ppb 51 ). Multi-qubit registers with comparable twoqubit gate fidelities to those achieved in natural-abundance 13 C devices (~99% 23 ) are expected to be feasible with reduced impurity concentration in future diamond growth.…”

Section: System Overviewmentioning

confidence: 94%

Robust quantum-network memory based on spin qubits in isotopically engineered diamond

et al. 2022

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Quantum networks can enable quantum communication and modular quantum computation. A powerful approach is to use multi-qubit nodes that provide quantum memory and computational power. Nuclear spins associated with defects in diamond are promising qubits for this role. However, dephasing during optical entanglement distribution hinders scaling to larger systems. Here, we show that a 13C-spin quantum memory in isotopically engineered diamond is robust to the optical link operation of a nitrogen-vacancy centre. The memory lifetime is improved by two orders-of-magnitude upon the state-of-the-art, surpassing reported times for entanglement distribution. Additionally, we demonstrate that the nuclear-spin state can survive ionisation and recapture of the nitrogen-vacancy electron. Finally, we use simulations to show that combining this memory with previously demonstrated entanglement links and gates can enable key network primitives, such as deterministic non-local two-qubit gates, paving the way for test-bed quantum networks capable of investigating complex algorithms and error correction.

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Section: System Overviewmentioning

confidence: 94%

Robust quantum-network memory based on spin qubits in isotopically engineered diamond

et al. 2022

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“…49 Other promising routes to extend the nuclear spin memory coherence time involve reducing the color center's state-dependent coupling strength (the main dephasing channel), e.g., by employing decoherence-protected subspaces (formed from two or more individual spins, or pairs of strongly coupled spins that mostly cancel the state-dependent hyperfine interaction term), 47,48,112 and using isotopically purified samples for which weakly coupled 13 C nuclear spin qubits can be controlled 113,114 ). Other methods are to engineer systems of coupled defects (e.g., involving a 13 C nuclear spin qubit coupled to a P1 center in the vicinity of an NV center 115 or to use the nitrogen nuclear spin of a second NV center (whose nitrogen nuclear spin is used as a memory) in proximity to the communicator NV center. 116,117…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

Quantum networks based on color centers in diamond

Ruf

Wan

Choi

et al. 2021

Journal of Applied Physics

160

100

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“…Crucially, the resulting spin-photon interface does not rely on the intrinsic optical transitions of the color centers, thereby mitigating the aforementioned problems with spectral stability [75]. Moreover, this approach is completely generic, and can be applied to color centers in other host materials [400]- [404], alongside providing a method to control optically inactive qubits [405], [406].…”

Section: A Strategies For a Universal Qubit-photon Interfacementioning

confidence: 99%

Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons

Shandilya

Flågan

Carvalho

et al. 2022

J. Lightwave Technol.

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Integrated quantum photonics devices in diamond have tremendous potential for many quantum applications, including long-distance quantum communication, quantum information processing, and quantum sensing. These devices benefit from diamond's combination of exceptional thermal, optical, and mechanical properties. Its wide electronic bandgap makes diamond an ideal host for a variety of optical active spin qubits that are key building blocks for quantum technologies. In landmark experiments, diamond spin qubits have enabled demonstrations of remote entanglement, memory-enhanced quantum communication, and multi-qubit spin registers with fault-tolerant quantum error correction, leading to the realization of multinode quantum networks. These advancements put diamond at the forefront of solid-state material platforms for quantum information processing. Recent developments in diamond nanofabrication techniques provide a promising route to further scaling of these landmark experiments towards real-life quantum technologies. In this paper, we focus on the recent progress in creating integrated diamond quantum photonic devices, with particular emphasis on spin-photon interfaces, cavity optomechanical devices, and spin-phonon transduction. Finally, we discuss prospects and remaining challenges for the use of diamond in scalable quantum technologies.

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Entanglement of dark electron-nuclear spin defects in diamond

Cited by 34 publications

References 70 publications

Robust quantum-network memory based on spin qubits in isotopically engineered diamond

Robust quantum-network memory based on spin qubits in isotopically engineered diamond

Quantum networks based on color centers in diamond

Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons

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