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To obtain compact and mobile quantum sensors for use outside of a laboratory environment (e.g. in super high- precision navigation instruments or local gravity sensors), it is necessary to generate a stable laser frequency pair with coherent phase. The noise levels generated by current two-photon laser systems are presently too high and can significantly obscure any useful signal readings. Other solutions tend to be complicated or bulky.
Academics at the University of Birmingham have developed an optical subsystem to generate a stable laser frequency pair using an optical IQ modulator configured to produce a single sideband at a modulation frequency higher or lower w.r.t. the carrier frequency.