Kavli Affiliate: Ronald Hanson
| First 5 Authors: Julia M. Brevoord, Julia M. Brevoord, , ,
| Summary:
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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