Quantum frequency conversion of single photons between wavelength bands is a key enabler to realizing widespread quantum networks. We demonstrate the quantum frequency conversion of a heralded 1551 nm photon to any wavelength within an ultrabroad (1226 - 1408 nm) range in a group-velocity-symmetric photonic crystal fiber (PCF), covering over 150 independent frequency bins. The target wavelength is controlled by tuning only a single pump laser wavelength. We find internal, and total, conversion efficiencies of 12(1)% and 1.4(2)%, respectively. For the case of converting 1551 nm to 1300 nm we measure a heralded g(2)(0)=0.25(6) for converted light from an input with g(2)(0)=0.034(8). We expect that this PCF can be used for a myriad of quantum networking tasks.
@article{arxiv.2207.14706,
title = {Ultratunable quantum frequency conversion in photonic crystal fiber},
author = {K. A. G. Bonsma-Fisher and P. J. Bustard and C. Parry and T. A. Wright and D. G. England and B. J. Sussman and P. J. Mosley},
journal= {arXiv preprint arXiv:2207.14706},
year = {2022}
}