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Updated: May 8, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

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

Orion Crisafulli¹, Nikolas Tezak, Daniel B S Soh

¹Ginzton Laboratory, Stanford University, 348 Via Pueblo Mall, Stanford, CA 94305, USA.

|August 14, 2013

Summary

We demonstrate how coherent quantum feedback can engineer optical parametric oscillator (OPO) output. This technique shapes squeezing spectra, broadening the usable frequency band for quantum applications.

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Area of Science:

Quantum optics
Nonlinear optics
Quantum information science

Background:

Degenerate optical parametric oscillators (OPOs) are crucial for generating non-classical states of light.
Controlling the spectral properties of OPO output is essential for quantum technologies.
Quantum feedback mechanisms offer a pathway to manipulate quantum states.

Purpose of the Study:

To investigate the impact of coherent quantum feedback on the squeezing spectra of a degenerate optical parametric oscillator (OPO).
To explore the potential of using an OPO network with feedback for tailoring quantum-optical properties.
To theoretically and experimentally validate the effects of coherent feedback on OPO output.

Main Methods:

Utilizing a two-OPO network where one OPO acts as a quantum plant and the other as a quantum controller.
Implementing coherent quantum feedback configurations between the two OPOs.
Analyzing the squeezing and anti-squeezing spectra of the plant OPO output.
Comparing experimental results with theoretical predictions.

Main Results:

Coherent feedback successfully shapes the output squeezing spectrum of the plant OPO.
The frequency of maximum squeezing is shifted away from the optical driving frequency.
The squeezing spectrum is broadened over a wider frequency band.
Experimental data aligns well with theoretical models.

Conclusions:

Coherent quantum feedback is an effective method for engineering the quantum-optical properties of OPO output.
This technique allows for tailored spectral characteristics, enhancing potential applications in quantum technologies.
The OPO network with feedback provides a versatile platform for quantum state manipulation.