A novel fiber-based scheme for generating quadrature entanglement between a specific pair of frequency bands is proposed. The scheme is based on use of a nonlinear fiber, a spectral pulse shaper, and an adaptive feedback loop. It is numerically predicted that at least -5 dB of the quadrature entanglement will be created by preparation of an appropriate initial phase spectrum. Optimal control of the four-wave mixing terms of the Kerr Hamiltonian is crucial for improvement of the entanglement.
© 2003 Optical Society of America
Daisuke Fujishima, Fumihiko Kannari, Masahiro Takeoka, and Masahide Sasaki, "Generation of entanglement between frequency bands by nonlinear fiber propagation and spectral pulse shaping," Opt. Lett. 28, 275-277 (2003)