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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Optimal strategy to certify quantum nonlocality.

S Gómez1,2, D Uzcátegui3, I Machuca4,5

  • 1Departamento de Física, Universidad de Concepción, 160-C, Concepción, Chile. santgomez@udec.cl.

Scientific Reports
|October 15, 2021
PubMed
Summary
This summary is machine-generated.

We developed a new method to certify quantum nonlocality, even with weak entanglement or high error rates. This technique enhances device-independent quantum applications by finding optimal Bell inequalities and reducing detector efficiency needs.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Foundations

Background:

  • Certifying quantum nonlocality is crucial for device-independent quantum applications.
  • Challenges arise from weakly entangled states and high error rates, common in noisy quantum channels.

Purpose of the Study:

  • To introduce an efficient technique for certifying quantum nonlocality.
  • To develop a method for finding Bell inequalities that maximize the gap between quantum predictions and classical limits.
  • To reduce the required photodetector efficiency for closing the detection loophole.

Main Methods:

  • A novel technique to identify Bell inequalities tailored to specific measurement frequencies.
  • Optimization of Bell inequalities to maximize the difference between quantum and classical predictions.
  • Experimental validation using weakly entangled photons.

Main Results:

  • The proposed method finds Bell inequalities with the largest possible gap, offering an efficient certification strategy.
  • The technique successfully improves the detection of quantum nonlocality from experimental data.
  • Reduced photodetector efficiency requirements were demonstrated, aiding in closing the detection loophole.

Conclusions:

  • The new technique provides an efficient and robust way to certify quantum nonlocality.
  • This method is particularly beneficial for applications involving weakly entangled states or noisy environments.
  • The findings advance the practical implementation of device-independent quantum technologies.