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Related Experiment Video

Updated: Nov 19, 2025

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

Experimental quantum reading with photon counting.

Giuseppe Ortolano^1,2, Elena Losero¹, Stefano Pirandola³

¹Quantum Metrology and Nano Technologies Division, INRiM, Strada delle Cacce 91, 10135 Torino, Italy.

Science Advances

|February 1, 2021

Summary

This summary is machine-generated.

Quantum reading achieves quantum advantage in retrieving information from optical memory using photon-counting measurements and entanglement. This method enhances digital data readout, outperforming classical strategies.

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Area of Science:

Quantum Information Science
Quantum Optics
Information Theory

Background:

Quantum hypothesis testing aims for quantum advantage over classical methods.
Quantum reading retrieves information from optical memory using lossy channels.

Purpose of the Study:

To demonstrate quantum advantage in quantum reading using practical measurements.
To show that entanglement-based quantum reading surpasses classical strategies.

Main Methods:

Theoretical analysis and experimental implementation of quantum reading.
Utilizing photon-counting measurements and maximum-likelihood decision.
Employing an entangled two-mode squeezed vacuum source.

Main Results:

Quantum advantage was theoretically and experimentally confirmed for quantum reading.
The demonstrated receiver outperformed classical strategies based on coherent states.
Entanglement and simple optics enhance digital data readout.

Conclusions:

Practical quantum reading with photon-counting measurements achieves quantum advantage.
Entangled states offer superior information retrieval in lossy channels.
This work paves the way for real-world quantum reading applications.