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Related Experiment Video

Updated: May 16, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Generating entangled microwave radiation over two transmission lines.

E Flurin¹, N Roch, F Mallet

¹Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, UMR 8551, Université P et M Curie, Université D Diderot 24, rue Lhomond, 75231 Paris Cedex 05, France.

Physical Review Letters

|December 11, 2012

Summary

Researchers created spatially separated, entangled microwave light states using Josephson mixers. This groundbreaking experiment demonstrates a new method for generating and measuring quantum entanglement at a rate of 6 mega entangled bits per second.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Area of Science:

Quantum optics and superconducting circuits.
Quantum information science and microwave photonics.

Background:

Generating entangled quantum states is crucial for quantum technologies.
Existing methods for creating entangled microwave light are limited.

Purpose of the Study:

To experimentally realize spatially separated two-mode squeezed states of microwave light.
To demonstrate a quantitative measure of entanglement generation.

Main Methods:

Utilized a Josephson mixer, a superconducting circuit, to generate entangled fields from quantum vacuum.
Employed a second Josephson mixer with a phase-shifted pump tone to verify entanglement.
Measured output noise levels to quantify the degree of entanglement.

Main Results:

Achieved the first experimental realization of spatially separated two-mode squeezed states of microwave light.
Demonstrated that output noise is lower than the vacuum state, proving entanglement.
Quantified entanglement generation at a rate of 6 mega entangled bits per second (Mebit·s⁻¹).

Conclusions:

The Josephson mixer is a viable tool for generating and measuring quantum entanglement in microwave light.
This work paves the way for advancements in quantum communication and computation.
The demonstrated entanglement rate signifies a significant step forward in quantum information processing.