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Related Experiment Video

Updated: May 30, 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

Demonstration of unconditional one-way quantum computations for continuous variables.

Ryuji Ukai¹, Noriaki Iwata, Yuji Shimokawa

¹Department of Applied Physics, School of Engineering, The University of Tokyo, Tokyo, Japan.

Physical Review Letters

|July 21, 2011

Summary

We demonstrate essential unitary operations for continuous-variable quantum computation using entangled optical modes. These measurement-controlled operations are necessary steps toward universal quantum computing.

Related Experiment Videos

Last Updated: May 30, 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

Area of Science:

Quantum Information Science
Quantum Optics
Continuous-Variable Quantum Computation

Background:

One-way quantum computation offers a promising route for quantum information processing.
Linear cluster states are crucial resources for continuous-variable quantum computation.

Purpose of the Study:

To demonstrate essential unitary operations for continuous-variable quantum computation.
To implement these operations using a linear cluster state of four entangled optical modes.
To perform operations in a measurement-controlled and unconditional manner.

Main Methods:

Utilized a linear cluster state of four entangled optical modes.
Performed unitary operations via quadrature measurements using homodyne detections.
Selected specific measurement angles to access different operations.

Main Results:

Successfully implemented three levels of squeezing operations.
Demonstrated a Fourier transformation operation.
All implemented operations were measurement-controlled and unconditional.

Conclusions:

The demonstrated linear transformations are necessary, though not sufficient, for universal quantum computation.
This work advances the development of continuous-variable one-way quantum computation.