Photonic Architecture for Scalable Quantum Information Processing in Diamond

Nemoto, Kae; Trupke, Michael; Devitt, Simon J.; Stephens, Ashley M.; Scharfenberger, Burkhard; Buczak, K.; Nöbauer, Tobias; Everitt, Mark S.; Schmiedmayer, Jörg; Munro, William J.

doi:10.1103/physrevx.4.031022

Cited by 182 publications

(239 citation statements)

References 94 publications

(144 reference statements)

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“…Recently achieved quantum teleportation rates based on differentiating the excited spin states with high selectivity would also significantly benefit from this speed-up 22 . Another entanglement protocol relies on state-dependent reflectivity (resonant scattering) of an incoming photon on the cavity 23 . In this approach, the overall Purcell enhancement is important because it determines the probabilities of reflection and no reflection.…”

Section: Discussionmentioning

confidence: 99%

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Coherent spin control of a nanocavity-enhanced qubit in diamond

et al. 2015

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A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Among solid-state systems, the nitrogen-vacancy centre in diamond has emerged as an excellent optically addressable memory with second-scale electron spin coherence times. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories, but scaling to larger networks requires more efficient spin-photon interfaces such as optical resonators.Here we report such nitrogen-vacancy-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 ms using a silicon hard-mask fabrication process. This spin-photon interface is integrated with on-chip microwave striplines for coherent spin control, providing an efficient quantum memory for quantum networks.

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Section: Discussionmentioning

confidence: 99%

“…In this approach, the overall Purcell enhancement is important because it determines the probabilities of reflection and no reflection. If we neglect pure dephasing, we can set C, the cooperativity, equal to F and the reflection probability 23 is approximately given by 1…”

Section: Discussionmentioning

confidence: 99%

Coherent spin control of a nanocavity-enhanced qubit in diamond

et al. 2015

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“…N is nitrogen, V vacancy, and the dark gray circles represent carbon. long-range quantum communications [1][2][3] and modular quantum computers [4][5][6]. There has been much interest in developing such optically connected quantum memories in solid state systems, chiefly among them the nitrogen vacancy (NV) center in diamond, which is distinguished by exceptionally long-lived spin ground states.…”

Section: Introductionmentioning

confidence: 99%

Scalable fabrication of coupled NV center - photonic crystal cavity systems by self-aligned N ion implantation

Schröder¹,

Walsh²,

Zheng³

et al. 2017

Opt. Mater. Express

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Abstract:Towards building large-scale integrated photonic systems for quantum information processing, spatial and spectral alignment of single quantum systems to photonic nanocavities is required. Here, we demonstrate spatially targeted implantation of nitrogen vacancy (NV) centers into the mode maximum of 2-d diamond photonic crystal cavities with quality factors up to 8000, achieving an average of 1.1 ± 0.2 NVs per cavity. Nearly all NV-cavity systems have significant emission intensity enhancement, reaching a cavity-fed spectrally selective intensity enhancement, F int , of up to 93. Although spatial NV-cavity overlap is nearly guaranteed within about 40 nm, spectral tuning of the NV's zero-phonon-line (ZPL) is still necessary after fabrication. To demonstrate spectral control, we temperature tune a cavity into an NV ZPL, yielding F Z PL int ∼ 5 at cryogenic temperatures.

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“…The essence of this method is based on how the NV center state affects the reflectivity of the cavity system [22]. In our work, we will modify the scheme in [21] to create spin-photon entanglement between the electron spin of an NV center, embedded into a cavity, and a single photon.…”

Section: Introductionmentioning

confidence: 99%

Measurement-device-independent quantum key distribution with nitrogen vacancy centers in diamond

2017

Self Cite

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Memory-assisted measurement-device-independent quantum key distribution (MA-MDI-QKD) has recently been proposed as a possible intermediate step towards the realization of quantum repeaters. Despite its relaxing some of the requirements on quantum memories, the choice of memory in relation to the layout of the setup and the protocol has a stark effect on our ability to beat existing no-memory systems. Here, we investigate the suitability of nitrogen vacancy (NV) centers, as quantum memories, in MA-MDI-QKD. We particularly show that moderate cavity enhancement is required for NV centers if we want to outperform no-memory QKD systems. Using system parameters mostly achievable by today's state of the art, we then anticipate some total key rate advantage in the distance range between 300 and 500 km for cavity-enhanced NV centers. Our analysis accounts for major sources of error including the dark current, the channel loss, and the decoherence of the quantum memories.

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Photonic Architecture for Scalable Quantum Information Processing in Diamond

Cited by 182 publications

References 94 publications

Coherent spin control of a nanocavity-enhanced qubit in diamond

Coherent spin control of a nanocavity-enhanced qubit in diamond

Scalable fabrication of coupled NV center - photonic crystal cavity systems by self-aligned N ion implantation

Measurement-device-independent quantum key distribution with nitrogen vacancy centers in diamond

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