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We present squeezing and anti-squeezing spectra of the output from adegenerate optical parametric oscillator (OPO) network arranged in differentcoherent quantum feedback configurations. One OPO serves as a quantum plant,the other as a quantum controller. The addition of coherent feedback enablesshaping of the output squeezing spectrum of the plant, and is found to becapable of pushing the frequency of maximum squeezing away from the opticaldriving frequency and broadening the spectrum over a wider frequency band. Theexperimental results are in excellent agreement with the developed theory, andillustrate the use of coherent quantum feedback to engineer the quantum-opticalproperties of the plant OPO output.

Squeezed light in an optical parametric oscillator network with coherent feedback quantum control