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Related Experiment Video

Updated: Dec 18, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Microwave quantum illumination using a digital receiver.

S Barzanjeh¹, S Pirandola^2,3, D Vitali^4,5,6

¹Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria.

Science Advances

|June 18, 2020

Summary

This summary is machine-generated.

Quantum illumination, using entangled photons, enhances detection of dim objects in noisy environments. This microwave frequency experiment shows a quantum advantage over classical radar, paving the way for new applications.

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Last Updated: Dec 18, 2025

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Published on: October 13, 2017

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Area of Science:

Quantum optics and microwave engineering
Exploration of quantum phenomena at microwave frequencies

Background:

Quantum illumination leverages entangled photon pairs to improve detection sensitivity in noisy conditions.
This technique shows promise for low-power applications like biomedical imaging and radar.

Purpose of the Study:

To experimentally investigate quantum illumination at microwave frequencies.
To assess the performance of a quantum illumination system against classical benchmarks in a free-space setup.

Main Methods:

Generation of entangled microwave fields.
Illumination of a room-temperature object at 1-meter distance.
Implementation of a digital phase-conjugate receiver with linear quadrature measurements.

Main Results:

The quantum illumination receiver demonstrated superior performance compared to a classical noise radar.
Even with entanglement breaking in the signal path, the quantum approach showed advantages.
Simulations with perfect idler photon detection confirmed a quantum advantage over classical methods.

Conclusions:

Quantum illumination is feasible and advantageous at microwave frequencies, even at room temperature.
The study highlights practical opportunities and challenges for implementing microwave quantum circuits in real-world applications.
Experimental validation paves the way for future room-temperature quantum technologies.