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Spectrally reconfigurable tin-vacancy centers for remote two-photon interference

Vladislav Bushmakin1,2,*, Oliver von Berg1, Colin Sauerzapf1, Sreehari Jayaram1, Jonathan Enßlin1, Tom Jäger1, Andrej Denisenko1, Ilja Gerhardt3, Vadim Vorobyov1 et al.

Di Liu4 and Jörg Wrachtrup1,2

  • *Contact author: v.bushmakin@pi3.uni-stuttgart.de
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Phys. Rev. Applied 26, 044023 – Published 7 October, 2026

DOI: https://doi.org/10.1103/cgf7-dd1b

Abstract

Scalable quantum networks rely on optical links between long-lived qubits to distribute entanglement. Tin-vacancy (SnV−) centers in diamond combine long spin coherence at liquid-helium temperatures with highly coherent, spin-dependent optical transitions, making them promising network qubits. Connecting independent centers, however, requires indistinguishable photons: solid-state inhomogeneity creates frequency mismatch, while inversion symmetry suppresses the first-order electrical response. Here, we establish optical connectivity between two remote SnV− centers in separate cryogenic nodes. Using local electrodes, we tune the optical transition by up to 4 GHz via the Stark effect while maintaining optical coherence. Bringing the two transitions into resonance yields remote Hong-Ou-Mandel interference with a measured zero-delay visibility of 80(6)% without postprocessing. The same electrodes provide dynamic spectral control, producing resolved Floquet sidebands at drive frequencies up to 1.5  GHz. These results establish a locally reconfigurable optical interface for connecting remote SnV− quantum-network nodes.

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Phys. Rev. Applied 26, 044023– Published 7 October, 2026
  • Received 13 December 2024
  • Revised 17 June 2026
  • Accepted 21 August 2026
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