Sagnac光纤环制备并分离简并关联光子对的实验研究

egenerate correlated photon pair, originated from spontaneous four-wave mixing in optical fiber, is a crucial resource widely applied in quantum information processing and high precision measurements. Based on the principle of quantum interference between the counter-propagating photon pairs in the loop, Sagnac fiber loop is a powerful tool for generating and splitting degenerate photon pairs. Utilizing two pulsed lights with different wavelengths, narrow-band degenerate photon pairs are generated in Sagnac fiber loop consisted of 300-m-long dispersion-shifted fiber. After the phase difference of photon pairs are managed by the length of single mode fiber with special dispersion, the identical twin photons are distributed to different spatial modes.