Photonic Indistinguishability of the Tin-Vacancy Center in Nanostructured Diamond
Jesús Arjona Martínez, Ryan A. Parker, Kevin C. Chen, Carola M. Purser, Linsen Li, Cathryn P. Michaels, Alexander M. Stramma, Romain Debroux, Isaac Harris, Martin Hayhurst Appel, Eleanor C. Nichols, Matthew E. Trusheim, Dorian A. Gangloff, Dirk Englund, Mete Atatüre
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_{-2.5}^{+0.3}% 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 π pulses of 77.1(8)% fidelity and show it is spectrally stable over 100 ms. A modest Purcell enhancement factor of 12 would enhance the indistinguishability to 95%.