Nonlinear Interaction between Two Chirped Broadband Single Photons

Abstract

AbstractCoherent correlation between two distant broadband single photons can be realized by using the nonlinear optical method, which provides a key technology for spread‐spectrum communication in the quantum network. Here, sum‐frequency generation (SFG) between two broadband single photons is experimentally demonstrated by using chirp technology. The results show that the efficiency of the SFG is 6.51 × 10−8, and the visibility of coherent correlation of two distant broadband photons of the telecommunications band is 93.7%. This technique can also be used for other quantum applications, such as quantum entanglement swapping and quantum communication.