Quantum Frequency Conversion of Single Photons from a Tin-Vacancy Center in Diamond
- URL: http://arxiv.org/abs/2509.01661v1
- Date: Mon, 01 Sep 2025 18:00:00 GMT
- Title: Quantum Frequency Conversion of Single Photons from a Tin-Vacancy Center in Diamond
- Authors: Julia M. Brevoord, Jan Fabian Geus, Tim Turan, Miguel Guerrero Romero, Daniel Bedialauneta RodrÃguez, Nina Codreanu, Alexander M. Stramma, Ronald Hanson, Florian Elsen, Bernd Jungbluth,
- Abstract summary: Diamond tin-vacancy (SnV) centers are promising candidates for building quantum network nodes.<n>We demonstrate highly efficient, low-noise quantum frequency conversion (QFC) of 619 nm photons to the telecom S-band at 1480 nm.
- Score: 30.5491665195957
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Diamond tin-vacancy (SnV) centers are promising candidates for building quantum network nodes. However, their native photon emission at 619 nm is incompatible with metropolitan-scale networks operating at low-loss telecom wavelengths. To address this, we demonstrate highly efficient, low-noise quantum frequency conversion (QFC) of 619 nm photons to the telecom S-band at 1480 nm. The conversion process combines 619 nm photons with 1064 nm pump light in an actively stabilized cavity containing a bulk monocrystalline potassium titanyl arsenate (KTA) crystal. We achieve an internal (external) conversion efficiency of (48 +/- 3)% ((28 +/- 2)%) and a noise photon rate per wavelength of 2.2 +/- 0.9 cts/s/pm, which is spectrally flat in the investigated frequency range of 40 GHz. Furthermore, we demonstrate that the efficiency remains above 80% of its maximum over a frequency range of 70 GHz. Finally, we generate a string of photons from a single waveguide-embedded SnV center using a train of excitation pulses and send these through the QFC. After the QFC, we observe a string of telecom photons displaying the SnV lifetime, confirming successful conversion. These results represent a critical step towards metropolitan-scale fiber-based quantum networks using SnV centers.
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