Methods and apparatus for producing highly tunable squeezed light

An apparatus, comprising:

• a substrate;
• a first beam splitter integrated onto the substrate, the first beam splitter having a first output and a second output;
• a ring resonator, in optical communication with the first beam splitter;
• and
• a tuning element in optical communication with the first beam splitter and the ring resonator, the tuning element configured to change a coupling strength of the ring resonator, the tuning element further configured to transmit optical signals between the first beam splitter and the ring resonator for generating squeezed light.

An apparatus, comprising:

• a substrate;
• a first beam splitter integrated onto the substrate and configured to receive an optical input, the first beam splitter further configured to split the optical input into a first portion having a first intensity and a second portion having a second intensity substantially equal to the first intensity;
• and
• a waveguide integrated onto the substrate, the waveguide having an input coupled to a first output of the first beam splitter to receive the first portion of the input optical signal and an output coupled to a second output of the first beam splitter to receive the second portion of the input optical signal, the input and output of the waveguide further configured to deliver the first portion and the second portion of the input optical signal back to the first beam splitter for producing a squeezed state of light.