All-fiber source of frequency-entangled photon pairs

作者：Li, Xiaoying^*; Yang, Lei; Ma, Xiaoxin; Cui, Liang; Ou, Zhe Yu; Yu, Daoyin

来源：Physical Review A, 2009, 79(3): 033817.

DOI：10.1103/PhysRevA.79.033817

• multiwave mixing
• photon-photon interactions
• quantum entanglement
• quantum interference phenomena
• quantum optics

We present an all-fiber source of frequency-entangled photon pairs by using four-wave mixing in a Sagnac fiber loop. Special care is taken to suppress the impurity of the frequency entanglement by cooling the fiber and by matching the polarization modes of the photon pairs counterpropagating in the fiber loop. Coincidence detection of signal and idler photons, which are created in pair and in different spatial modes of the fiber loop, shows the quantum interference in the form of spatial beating, while the single counts of the individual signal (idler) photons keep constant. When the production rate of photon pairs in each propagation direction of the fiber loop is about 0.065 pairs/pulse, the envelope of the quantum interference reveals a visibility of (95 +/- 2)%, which is close to the calculated theoretical limit 98.7%.

• 出版日期2009-3
• 单位天津大学