Scalable spin–photon entanglement by time-to-polarization conversion

Vasconcelos, Rui; Reisenbauer, Sarah; Salter, C. L.; Wachter, Georg; Wirtitsch, Daniel; Schmiedmayer, Jörg; Walther, Philip; Trupke, Michael

doi:10.1038/s41534-019-0236-x

Cited by 36 publications

(28 citation statements)

References 33 publications

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“…The physics of the vibronic coupling in the excited state is closely related to quantum applications, notably those requiring emission of highly indistinguishable photons. This comprises distribution of remote entanglement via photonic interference in a quantum-repeater network [37] and generation of photonic cluster states for measurementbased quantum computation [38,39]. The discussed interaction process with phonons in the excited state is directly related to the rate of pure dephasing of a single-photon state, which affects the photon indistinguishability [40].…”

Section: Discussionmentioning

confidence: 99%

Vibronic States and Their Effect on the Temperature and Strain Dependence of Silicon-Vacancy Qubits in4H-SiC

et al. 2020

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Silicon-vacancy qubits in silicon carbide (SiC) are emerging tools in quantum-technology applications due to their excellent optical and spin properties. In this paper, we explore the effect of temperature and strain on these properties by focusing on the two silicon-vacancy qubits, V1 and V2, in 4H-SiC. We apply density-functional theory beyond the Born-Oppenheimer approximation to describe the temperaturedependent mixing of electronic excited states assisted by phonons. We obtain a polaronic gap of around 5 and 22 meV for the V1 and V2 centers, respectively, which results in a significant difference in the temperature-dependent dephasing and zero-field splitting of the excited states, which explains recent experimental findings. We also compute how crystal deformations affect the zero-phonon line of these emitters. Our predictions are important ingredients in any quantum applications of these qubits sensitive to these effects.

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Section: Discussionmentioning

confidence: 99%

Vibronic States and Their Effect on the Temperature and Strain Dependence of Silicon-Vacancy Qubits in4H-SiC

et al. 2020

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“…The lower bound of the entanglement fidelity can be estimated using the formula 5,42 F ! 1 2 À ρ "V;"V þ ρ #H;#H À ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi ρ "H;"H Á ρ #V;#V p þρ "V;"V þρ #H;#H Àρ "H;"H Àρ #V;#V Á :…”

Section: Lower Bound Of Fidelity and Correlation Contrastmentioning

confidence: 99%

Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry–Perot cavity

2021

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The development of efficient network nodes is a key element for the realization of quantum networks which promise great capabilities as distributed quantum computing or provable secure communication. We report the realization of a quantum network node using a trapped ion inside a fiber-based Fabry–Perot cavity. We show the generation of deterministic entanglement at a high fidelity of 90.1(17)% between a trapped Yb ion and a photon emitted into the resonator mode. We achieve a success probability for generation and detection of entanglement for a single shot of 2.5 × 10−3 resulting in 62 Hz entanglement rate.

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“…In this encoding, neither polarisation selective optical rules nor energy-degenerate transitions are required. Further converting the time bins into polarisation degrees of freedom bypasses the issue of excited state dephasing presented above and has been demonstrated with an NV center [106].…”

Section: Pendix B)mentioning

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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Scalable spin–photon entanglement by time-to-polarization conversion

Cited by 36 publications

References 33 publications

Vibronic States and Their Effect on the Temperature and Strain Dependence of Silicon-Vacancy Qubits in4H-SiC

Vibronic States and Their Effect on the Temperature and Strain Dependence of Silicon-Vacancy Qubits in4H-SiC

Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry–Perot cavity

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

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