The frequency conversion of cw continuous variable quantum states via second-order nonlinear optical processes is theoretically analyzed. It is shown that wideband frequency conversion of cw continuous variable quantum states is feasible by sum-frequency generation. For difference-frequency generation, besides as an optimal-phase-conjugation frequency-conversion process, any one quadrature of the quantum state can be frequency converted through it. Particularly, we analyze the influence of pump field fluctuations on the fidelity of the frequency-conversion process for a coherent state input.
© 2008 Optical Society of America
Original Manuscript: July 24, 2007
Revised Manuscript: December 21, 2007
Manuscript Accepted: December 29, 2007
Published: January 31, 2008
Yongmin Li and Kuanshou Zhang, "Frequency conversion of continuous variable quantum states," J. Opt. Soc. Am. B 25, 269-273 (2008)