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

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Published on: September 5, 2019

Genuine hidden quantum nonlocality.

Flavien Hirsch¹, Marco Túlio Quintino, Joseph Bowles

¹Département de Physique Théorique, Université de Genève, 1211 Genève, Switzerland.

Physical Review Letters

|November 5, 2013

Summary

This summary is machine-generated.

Researchers demonstrate genuine hidden nonlocality in quantum states using local filters and sequential measurements. This reveals nonlocality previously undetectable with standard Bell tests, even achieving maximal violation.

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Area of Science:

Quantum Information Science
Quantum Foundations

Background:

Nonlocality is a key feature of quantum mechanics, typically demonstrated via Bell tests.
Hidden nonlocality has been observed but limited to projective measurements.
Generalizing the detection of hidden nonlocality is an open challenge.

Purpose of the Study:

To prove the existence of genuine hidden nonlocality for general local measurements.
To present a class of entangled states exhibiting this phenomenon.
To investigate the potential for maximal violation of Bell inequalities through sequential measurements.

Main Methods:

Construction of a local model for general local measurements on two-qubit entangled states.
Application of local filters prior to Bell inequality tests.
Analysis of measurement sequences to reveal nonlocality.

Main Results:

Demonstration of genuine hidden nonlocality in a class of two-qubit entangled states.
Violation of Bell inequalities after local filtering with general local measurements.
Identification of states where hidden nonlocality can be maximal.

Conclusions:

Genuine hidden nonlocality exists and is not restricted to projective measurements.
Sequential measurements are crucial for revealing nonlocality in certain entangled states.
Maximal violation of Bell inequalities is achievable through hidden nonlocality.