Coupling of a single tin-vacancy center to a photonic crystal cavity in diamond

Kuruma, Kazuhiro; Pingault, Benjamin; Chia, Cleaven; Renaud, Dylan; Hoffmann, Patrick; Iwamoto, Satoshi; Ronning, Carsten; Lončar, Marko

doi:10.1063/5.0051675

Cited by 58 publications

(33 citation statements)

References 44 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%

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%

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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“…Although temperature increase in the device is only a few Kelvin, the requirement of constant heating can possibly be difficult in cryogenic conditions. Moving forward, the tuning method can be replaced by other methods that are compatible with cryogenics and quantum experiments, such as oxidation tuning [39,40], light-induced chemical etching [41] or laser-induced gas desorption [42].…”

Section: Discussionmentioning

confidence: 99%

Enhanced nonlinear optomechanics in a coupled-mode photonic crystal device

Burgwal¹,

Verhagen²

2022

Preprint

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The nonlinear component of the optomechanical interaction between light and mechanical vibration promises many exciting classical and quantum mechanical applications, but is generally weak.Here we demonstrate enhancement of nonlinear optomechanical measurement of mechanical motion by using pairs of coupled optical and mechanical modes in a photonic crystal device. In the same device we show linear optomechanical measurement with a strongly reduced input power and reveal how both enhancements are related. Our design exploits anisotropic mechanical elasticity to create strong coupling between mechanical modes while not changing optical properties. Additional thermo-optic tuning of the optical modes is performed with an auxiliary laser and a thermallyoptimised device design. We envision broad use of this enhancement scheme in multimode phonon lasing, two-phonon heralding and eventually nonlinear quantum optomechanics.

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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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Coupling of a single tin-vacancy center to a photonic crystal cavity in diamond

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Cited by 58 publications

References 44 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

Enhanced nonlinear optomechanics in a coupled-mode photonic crystal device

Coherence of a charge stabilised tin-vacancy spin in diamond

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