Resonant Excitation and Purcell Enhancement of Coherent Nitrogen-Vacancy Centers Coupled to a Fabry-Perot Microcavity

Ruf, Maximilian; Weaver, Matthew; Dam, Suzanne B. van; Hanson, Ronald K.

doi:10.1103/physrevapplied.15.024049

Cited by 67 publications

(47 citation statements)

References 62 publications

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“…Finally, we identify ionisation of the NV centre as a limiting mechanism and show that the data qubit can be protected through fast controlled resetting of the NV charge state. When combined with recent progress with optical cavities towards enhanced entanglement rates [33,35] and high-fidelity quantum gates [24,28,37], these results indicate that nuclear spins in isotopically engineered samples provide a promising testbed for quantum networks.…”

Section: Introductionmentioning

confidence: 84%

“…Further improvements in r dec are possible by further improving the intrinsic coherence times, and reducing the time needed for the entanglement sequence. Additionally, an improvement of the optical entanglement success probability by a factor ∼ 100 is feasible using Fabry-Pérot micro-cavities [33,35], which would also greatly improve the overall operation speed, as is required for advancing beyond prototype networks and towards technological applications. Together such improvements would yield η * link > 1000, which is anticipated to be sufficient to realise large-scale error corrected quantum networks [3].…”

Section: Discussionmentioning

confidence: 99%

“…The resulting network operation is inherently probabilisticif entanglement generation cycles do not succeed early enough, all previously established quantum states stored in the network memory are lost -hindering the scaling to larger systems operating over many cycles. Realizing large η * link will require higher entanglement rates r ent through efficient spin photon interfaces [32][33][34][35] and/or reduced dephasing of the nuclear spin qubits during the network operation (r dec ) [29,36].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Bradley¹,

Bone²,

Moller³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

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“…The hybridization of modes confined in the air and diamond layers of the resonator manifests in avoided crossings (Fig. 1 (b)) [41,[46][47][48][49][50]. The cavity resonance frequencies depend on both the separation of the two mirrors and the thickness of the diamond at the location of the cavity mode (see Appendix 2).…”

Section: Methodsmentioning

confidence: 99%

Widely-tunable, doubly-resonant Raman scattering on diamond in an open microcavity

Flågan,

Maletinsky,

Warburton

et al. 2021

Preprint

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Raman lasers based on bulk diamond are a valuable resource for generating coherent light in wavelength regimes where no common laser diodes are available. Nevertheless, the widespread use of such lasers is limited by their high threshold power requirements on the order of several Watts. Using on-chip microresonators, a significant reduction of the lasing threshold by more than two orders of magnitude has been shown. However, these resonators lack a continuous tuning mechanism and, mainly due to fabrication limitations, their implementation in the visible remains elusive. Here, we propose a platform for a diamond Raman laser in the visible. The device is based on a miniaturized, open-access Fabry-Perot cavity. Our microcavity provides widely-tunable doubly-resonant enhancement of Raman scattering from high quality single-crystalline diamond. We demonstrate a >THz continuous tuning range of doubly-resonant Raman scattering, a range limited only by the reflective stopband of the mirrors. Based on the experimentally determined quality factors exceeding 300 000, our theoretical analysis suggests that, with realistic improvements, a sub-mW threshold is readily within reach. Our findings pave the way to the creation of a universal low-power frequency shifter, a potentially valuable addition to the nonlinear optics toolbox.

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“…However, they spontaneously emit into many spatial and spectral modes, resulting in low spin-photon entanglement generation rates. A variety of optical nanostructures have been explored to overcome this issue by achieving efficient spin-photon interfaces, including 1D/2D photonic crystal cavities [8][9][10], ring resonators [11], fiber-based Fabry-Perot cavities [12,13], and circular grating outcoupler [14]. The Purcell enhancement present in cavities enables efficient single-mode coupling as spontaneous emission is directed into the cavity mode.…”

Section: Introductionmentioning

confidence: 99%

A vertically-loaded diamond microdisk resonator spin-photon interface

Duan,

Chen,

Englund

et al. 2021

Preprint

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We propose and optimize a vertically-loaded diamond microdisk resonator (VLD-MoRt) coupled to a nitrogen-vacancy (NV) center in diamond for efficient collection of fluorescence emission into low numerical aperture (NA) free-space modes. The VLDMoRt achieves a Purcell enhancement of 172 with 39% of the emitted light collected within a NA of 0.6, leading to a total external spin-photon collection efficiency of 0.33. As the design is compatible with established nanofabrication techniques and couples to low-NA modes accessible by cryogenic free-space optical systems, it is a promising avenue for increasing the efficiency and scalability of quantum devices based on diamond quantum emitters.

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Resonant Excitation and Purcell Enhancement of Coherent Nitrogen-Vacancy Centers Coupled to a Fabry-Perot Microcavity

Cited by 67 publications

References 62 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

Widely-tunable, doubly-resonant Raman scattering on diamond in an open microcavity

A vertically-loaded diamond microdisk resonator spin-photon interface

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