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

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

Published on: September 5, 2019

All entangled quantum states are nonlocal.

Francesco Buscemi¹

¹Institute for Advanced Research, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan.

Physical Review Letters

|September 26, 2012

Summary

This summary is machine-generated.

We introduce a new method for transforming quantum states using local operations and shared randomness, moving beyond traditional entanglement theory. This approach leverages nonlocal games to detect quantum entanglement and nonlocality in quantum states.

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Area of Science:

Quantum Information Science
Quantum Foundations

Background:

Traditional entanglement theory relies on local operations and classical communication.
Exploring alternative frameworks for quantum state manipulation is crucial.

Purpose of the Study:

To investigate quantum state interconversion using local operations and shared randomness.
To establish criteria for state transformations within this new framework.

Main Methods:

Defining necessary and sufficient conditions for state interconversion.
Utilizing payoff values from nonlocal games to characterize quantum states.

Main Results:

A class of nonlocal games can witness quantum entanglement, even when weak.
These games reveal nonlocality in any entangled quantum state.

Conclusions:

Local operations and shared randomness offer a viable alternative for quantum state manipulation.
Nonlocal games provide a powerful tool for detecting entanglement and nonlocality.