Orbital and Spin Dynamics of Single Neutrally-Charged Nitrogen-Vacancy Centers in Diamond

Baier, Simon; Bradley, C. E.; Middelburg, Thomas; Dobrovitski, V. V.; Taminiau, T. H.; Hanson, Ronald K.

doi:10.1103/physrevlett.125.193601

Cited by 28 publications

(24 citation statements)

References 36 publications

(60 reference statements)

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“…Thus, we can extract T NV0 1 = 570 (30) µs. This value deviates from another recent cryogenic measurement (T NV0 1 = 1.51(1)s) [59]. It is likely that this discrepancy is either due to the much higher magnetic field (B z = 1850 G) or absence of a P1 bath in that work.…”

Section: Mitigating Ionisationcontrasting

confidence: 92%

“…We note that the NV 0 spin-T 1 may increase with reduction of impurities, or under different magnetic fields, which would result in faster nuclear spin dephasing. This challenge might be overcome by either inducing fast NV 0 spin-flips using microwave driving, or by performing feedback correction using recently demonstrated NV 0 optical spin-readout at high magnetic fields [59].…”

Section: Mitigating Ionisationmentioning

confidence: 99%

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

Bradley¹,

Bone²,

Moller³

et al. 2021

Preprint

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Quantum networks can enable long-range quantum communication and modular quantum computation. A powerful approach is to use multi-qubit network nodes which provide the quantum memory and computational power to perform entanglement distillation, quantum error correction, and information processing. Nuclear spins associated with optically-active defects in diamond are promising qubits for this role. However, their dephasing during entanglement distribution across the optical network hinders scaling to larger systems. In this work, we show that a single 13 C spin in isotopically engineered diamond offers a long-lived quantum memory that is robust to the optical link operation of an NV centre. The memory lifetime is improved by two orders-of-magnitude upon the state-of-the-art, and exceeds the best reported times for remote entanglement generation. We identify ionisation of the NV centre as a newly limiting decoherence mechanism. As a first step towards overcoming this limitation, we demonstrate that the nuclear spin state can be retrieved with high fidelity after a complete cycle of ionisation and recapture. Finally, we use numerical simulations to show that the combination of this improved memory lifetime with previously demonstrated entanglement links and gate operations can enable key primitives for quantum networks, such as deterministic non-local two-qubit logic operations and GHZ state creation across four network nodes. Our results pave the way for test-bed quantum networks capable of investigating complex algorithms and error correction.

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Section: Mitigating Ionisationcontrasting

confidence: 92%

Section: Mitigating Ionisationmentioning

confidence: 99%

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

Bradley¹,

Bone²,

Moller³

et al. 2021

Preprint

Self Cite

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“…We note that the Purcell factor presented here is universal: F P depends solely on the cavity parameters, not on the properties of the emitter. The versatile design of the cavity allows a wide-range of solid-state single-photon emitters to be embedded [98], for instance other colour centres in diamond [99][100][101][102][103][104][105][106], defects in SiC [107][108][109][110][111], rare-earth ions in a crystalline host [112][113][114][115][116] or emitters in 2D materials [117,118].…”

Section: Discussionmentioning

confidence: 99%

High quality-factor diamond-confined open microcavity

Flågan,

Riedel,

Javadi

et al. 2021

Preprint

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With a highly coherent, optically addressable electron spin, the nitrogen vacancy (NV) centre in diamond is a promising candidate for a node in a quantum network. However, the NV centre is a poor source of coherent single photons owing to a long radiative lifetime, a small branching ratio into the zero-phonon line (ZPL) and a poor extraction efficiency out of the high-index host material. In principle, these three shortcomings can be addressed by resonant coupling to a single mode of an optical cavity. Utilising the weak-coupling regime of cavity electrodynamics, resonant coupling between the ZPL and a single cavity-mode enhances the transition rate and branching ratio into the ZPL. Furthermore, the cavity channels the light into a well-defined mode thereby facilitating detection with external optics. Here, we present an open Fabry-Perot microcavity geometry containing a single-crystal diamond membrane, which operates in a regime where the vacuum electric field is strongly confined to the diamond membrane. There is a field anti-node at the diamond-air interface. Despite the presence of surface losses, quality factors exceeding 120 000 and a finesse F = 11 500 were observed. We investigate the interplay between different loss mechanisms, and the impact these loss channels have on the performance of the cavity. This analysis suggests that the "waviness" (roughness with a spatial frequency comparable to that of the microcavity mode) is the mechanism preventing the quality factors from reaching even higher values. Finally, we apply the extracted cavity parameters to the NV centre and calculate a predicted Purcell factor exceeding 150.

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“…Several of diamond's defects have been investigated for quantum applications (Fig. 1a,c), most notably the negatively charged NV center [1,2,3], as well as other defects including SiV − , SiV 0 , NV 0 , and N 0 S (substitutional nitrogen) [4,5,6,7,8]. The NV center is an optically-addressable electronic spin (Fig.…”

Section: Introductionmentioning

confidence: 99%

Materials challenges for quantum technologies based on color centers in diamond

Rodgers¹,

Hughes²,

Xie³

et al. 2021

Preprint

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Emerging quantum technologies require precise control over quantum systems of increasing complexity. Defects in diamond, particularly the negatively charged nitrogen-vacancy (NV) center, are a promising platform with the potential to enable technologies ranging from ultra-sensitive nanoscale quantum sensors, to quantum repeaters for long distance quantum networks, to simulators of complex dynamical processes in many-body quantum systems, to scalable quantum computers. While these advances are due in large part to the distinct material properties of diamond, the uniqueness of this material also presents difficulties, and there is a growing need for novel materials science techniques for characterization, growth, defect control, and fabrication dedicated to realizing quantum applications with diamond. In this review

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Orbital and Spin Dynamics of Single Neutrally-Charged Nitrogen-Vacancy Centers in Diamond

Cited by 28 publications

References 36 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

High quality-factor diamond-confined open microcavity

Materials challenges for quantum technologies based on color centers in diamond

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