Single-photon frequency hopping: application to quantum interferometry
Paolo Mataloni, Gian Luca Giorgi, Francesco De Martini · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2003
A novel Mach-Zehnder interferometer terminated at two different frequencies which realizes for a single photon quantum state (qubit) the nonlinear frequency conversion has been realized. The information-preserving character of the nonlinear process allows to transfer the coherence of the input to the output state. The results of this experiment can have relevant applications in quantum information technology.