Frequency tunable source of entangled optical fields

Summary form only given. We have reported the construction of a tunable source of nonclassical light along with experimental data demonstrating the entanglement between signal and idler fields separated by 800 MHz. The entanglement corresponds to a noise reduction of 4 dB beyond the SQL. We have already used the tunable squeezed output of this source to probe spin polarised cesium atoms. Replacing the degenerate squeezed output with the nondegenerate EPR-correlated signal and idler fields makes the source suitable for future experiments with quantum memory read-out via atom-to-light teleportation.