Quantum Photonic Interface for Tin-Vacancy Centers in Diamond

Rugar, Alison E.; Aghaeimeibodi, Shahriar; Riedel, Daniel; Dory, Constantin; Lu, Haiyu; McQuade, Patrick J.; Shen, Zhi‐Xun; Melosh, Nicholas A.; Vučković, Jelena

doi:10.1103/physrevx.11.031021

Cited by 55 publications

(48 citation statements)

References 36 publications

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“…From the simulated mode volume of 128( λ n ) 3 for the fundamental TM 00 mode, we find the theoretical maximum Purcell enhancement of 77 in this device. The observed Purcell enhancement is comparable to that achieved in the first integrations of the diamond silicon vacancy 8,35 and tin vacancy 12,13 into photonic crystal nanobeam cavities, despite the much stronger mode confinement of those devices. We attribute this to the optimal dipole overlap of the V Si with the cavity TM mode and the less stringent emitter positioning requirements of the microdisks.…”

supporting

confidence: 63%

“…Although Purcell enhancement has been observed in several color center platforms 8,11,12,35,36 , including thinfilm diamond 37 and SiC 10 , to date cavity-coupled color centers that retain their optical coherence have only been demonstrated in bulk-carved diamond 8,9 . To quantify the optical coherence and the spectral stability of the V Si in 4H-SiCOI microdisks, we perform continuous PLE scans on each emitter while on-and off-resonance with the cavity.…”

mentioning

confidence: 99%

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Optical superradiance of a pair of color centers in an integrated silicon-carbide-on-insulator microresonator

Lukin¹,

Guidry²,

Yang³

et al. 2022

Preprint

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An outstanding challenge for color center-based quantum information processing technologies is the integration of optically-coherent emitters into scalable thin-film photonics. Here, we report on the integration of near-transform-limited silicon vacancy (VSi) defects into microdisk resonators fabricated in a CMOS-compatible 4H-Silicon Carbide-on-Insulator platform. We demonstrate a single-emitter cooperativity of up to 0.8 as well as optical superradiance from a pair of color centers coupled to the same cavity mode. We investigate the effect of multimode interference on the photon scattering dynamics from this multi-emitter cavity quantum electrodynamics system. These results are crucial for the development of quantum networks in silicon carbide and bridge the classicalquantum photonics gap by uniting optically-coherent spin defects with wafer-scalable, state-of-theart photonics.Color centers 1-3 are among the leading contenders for the realization of distributed quantum information processing, including communication 4,5 and computation 6 , combining a long-lived multi-qubit spin register 7 with a photonic interface in the solid state. To continue scaling up quantum networks while maintaining high entanglement generation rates, the intrinsically weak interaction between photons and color centers must be enhanced via integration into photonic resonators 5,8-13 . Efforts in cavity integration have already enabled milestone demonstrations such as cavity-mediated coherent interaction between two emitters 9 , single-emitter cooperativity exceeding 100 and spin-memory-assisted quantum communication 5 . The ultimate goal of quantum computation and error-protected communication 14 requires the realization of photonic circuits with high complexity and minimal inter-node loss, and will require bringing together all integrated photonics expertise developed in the past two decades. 15 Yet color center technologies cannot at present take advantage of the state of the art in integrated photonics, due to two central challenges. First, thin-film-oninsulator photonics technologies have been incompatible with high-quality color centers: this motivated the focus on bulk-crystal-carving methods 8,16-19 , suitable for fabrication of individual devices but restrictive in terms of large-scale monolithic photonic circuits. Second, inversion symmetry, which protects optical transitions from electric fields (to first order 20,21 ), had been widely considered to be a prerequisite for color centers to maintain optical coherence in nanophotonic structures. This notion motivates the dominant focus on group-IV color centers in diamond (SiV, SnV, GeV) 22 , and eliminates from consideration an entire class of materials that lack crystal inversion symmetry. Among these materials is silicon carbide (SiC) 23 , which has otherwise emerged as the top contender for wafer-scale integration of color centers with excellent spin-optical properties (such as the sili-con vacancy (V Si ) 19,24-27 and the divacancy 28,29 ). This

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supporting

confidence: 63%

mentioning

confidence: 99%

Optical superradiance of a pair of color centers in an integrated silicon-carbide-on-insulator microresonator

Lukin¹,

Guidry²,

Yang³

et al. 2022

Preprint

Self Cite

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“…Furthermore, we probe the spin coherence of a charge stabilised SnV − centre and find a spin lifetime T 1 >20 ms and a spin dephasing time of T * 2 = 5(1) µs at a temperature of 1.7 K. As an outlook for further applications, we implement a single shot readout scheme which yields a readout fidelity of 74 %, demonstrating the highly cycling spin conserving transitions even in the case of a large angle of 54.7°between magnetic field and the symmetry axis of the defect. It is straightforward to increase the readout fidelity by implementing means to improve the total collection efficiency of our optical setup such as utilising optical antennas [31], micropillars [3], solid immersion lenses, or photonic crystal structures [32,33]. In summary, we have shown that the charge stabilisation protocol developed in this work renders the SnV − centre suitable for reliable application in QIP, in which well defined charge states, longterm stable optical resonances for the emission of highly indistinguishable photons, long spin coherence times and efficient state readout are absolutely crucial.…”

Section: Discussionmentioning

confidence: 99%

Coherence of a charge stabilised tin-vacancy spin in diamond

Görlitz,

Herrmann,

Fuchs

et al. 2021

Preprint

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Quantum information processing (QIP) with solid state spin qubits strongly depends on the efficient initialisation of the qubit's desired charge state. While the negatively charged tin-vacancy (SnV − ) centre in diamond has emerged as an excellent platform for realising QIP protocols due to long spin coherence times at liquid helium temperature and lifetime limited optical transitions, its usefulness is severely limited by termination of the fluorescence under resonant excitation [1,2,3]. Here, we unveil the underlying charge cycle of group IV-vacancy (G4V) centres and exploit it to demonstrate highly efficient initialisation of the desired negative charge state of single SnV centres while preserving long term stable optical resonances. We furthermore all-optically probe the coherence of the ground state spins by means of coherent population trapping and find a spin dephasing time of 5(1) µs. Additionally, we demonstrate proof-of-principle single shot spin state readout without the necessity of a magnetic field aligned to the symmetry axis of the defect.

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“…The more recently studied group IV colour centres in diamond possess an inversion-symmetric molecular structure that makes them less sensitive to electric field fluctuations, ultimately resulting in improved optical properties and compatibility with diamond nanostructures [68,71,[90][91][92], such as waveguides and nanocavities, achieving full system detection efficiencies (η CE ) of 85% [62] and cavity-coupling efficiencies (β-factor) of up to 95% [72,93,94]. Group IV colour centres have also been coupled to nanocavities with cooperativity C = 105 ± 11, resulting in Purcell enhancement of the radiative decay paths and an improvement of η QE [62].…”

Section: Suitable Systems For Implementationmentioning

confidence: 99%

Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register

Michaels

Martínez

Debroux

et al. 2021

Quantum

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Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. Proposals to generate multi-dimensional lattice cluster states have identified coupled spin-photon interfaces, spin-ancilla systems, and optical feedback mechanisms as potential schemes. Following these, we propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register. Our scheme makes use of the contact hyperfine interaction to enable universal quantum gates between the interface spin and a local nuclear register and funnels the resulting entanglement to photons via the spin-photon interface. Among several quantum emitters, we identify the silicon-29 vacancy centre in diamond, coupled to a nanophotonic structure, as possessing the right combination of optical quality and spin coherence for this scheme. We show numerically that using this system a 2×5-sized cluster state with a lower-bound fidelity of 0.5 and repetition rate of 65 kHz is achievable under currently realised experimental performances and with feasible technical overhead. Realistic gate improvements put 100-photon cluster states within experimental reach.

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Quantum Photonic Interface for Tin-Vacancy Centers in Diamond

Cited by 55 publications

References 36 publications

Optical superradiance of a pair of color centers in an integrated silicon-carbide-on-insulator microresonator

Optical superradiance of a pair of color centers in an integrated silicon-carbide-on-insulator microresonator

Coherence of a charge stabilised tin-vacancy spin in diamond

Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register

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