| Abstract: | A non-linear optical device is provided. The device comprises an optical
disk or ring microresonator fabricated from a material that exhibits an
optical nonlinearity able to produce degenerate four-wave mixing (FWM) in
response to a pump beam having a pump frequency in a specified effective
range. The microresonator is conformed to exhibit an angular group
velocity minimum at a pump frequency within the specified effective range
such that there is zero angular group velocity dispersion at the pump
frequency. We refer to such a pump frequency as the "zero dispersion
frequency". In embodiments, excitation of the resonator by a pump beam of
sufficient intensity at the zero-dispersion frequency causes the
resonator to emit a frequency comb of entangled photon pairs wherein the
respective frequencies in each pair are symmetrically placed about the
zero-dispersion frequency. |