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Abstract
We propose a method to convert quantum states of the electromagnetic field between different wavelengths, by using entangled beams from parametric down conversion in an optical parametric oscillator (OPO). The OPO is pumped at 532 nm, giving rise to a bright beam (~ mW) resonant with D1 line of Rb atoms. The idler beam, at 1608 nm, is within the L band in telecom, suitable for long distan…