A zero-field protocol for 117SnV- color centers keeps the nuclear memory qubit insensitive to optical excitation, demonstrated with high-fidelity microwave control in a photonic integrated circuit.
Photonic indistinguishability of the tin-vacancy center in nanostructured diamond
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abstract
Tin-vacancy centers in diamond are promising spin-photon interfaces owing to their high quantum-efficiency, large Debye-Waller factor, and compatibility with photonic nanostructuring. Benchmarking their single-photon indistinguishability is a key challenge for future applications. Here, we report the generation of single photons with $99.7^{+0.3}_{-2.5}\%$ purity and $63(9)\%$ indistinguishability from a resonantly excited tin-vacancy center in a single-mode waveguide. We obtain quantum control of the optical transition with $1.71(1)$-ns-long $\pi$-pulses of $77.1(8)\%$ fidelity. A modest Purcell enhancement factor of 12 would enhance the indistinguishability to $95$\%. The greater than $100$ ms spectral stability shown would then enable strings of up to $10^6$ identical photons to be generated.
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High-Fidelity Control of a Strongly Coupled Electro-Nuclear Spin-Photon Interface
A zero-field protocol for 117SnV- color centers keeps the nuclear memory qubit insensitive to optical excitation, demonstrated with high-fidelity microwave control in a photonic integrated circuit.