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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Experimental quantum reading with photon counting
Giuseppe Ortolano1,2, Elena Losero1, Stefano Pirandola3
1Quantum Metrology and Nano Technologies Division, INRiM, Strada delle Cacce 91, 10135 Torino, Italy.
Science Advances
|February 1, 2021
Summary
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.
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.
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