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Updated: May 18, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

Using separable Bell-diagonal states to distribute entanglement.

Alastair Kay1

  • 1Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Alice can create quantum entanglement with Bob by sending a separable qubit state. This study identifies essential resource state properties for distributing entanglement, proving conditions for Bell-diagonal states.

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Last Updated: May 18, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

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Area of Science:

  • Quantum Information Science
  • Quantum Entanglement
  • Quantum Communication Protocols

Background:

  • Quantum entanglement is a fundamental quantum mechanical phenomenon.
  • Entanglement distribution is crucial for quantum communication and computation.
  • Previous studies explored various entanglement generation and distribution methods.

Purpose of the Study:

  • To elucidate the essential properties of resource states for entanglement distribution.
  • To analyze a simplified protocol for generating entanglement between Alice and Bob.
  • To determine the necessary and sufficient conditions for using Bell-diagonal states as resources.

Main Methods:

  • Theoretical analysis of a minimal entanglement distribution protocol.
  • Investigation of the properties of Bell-diagonal states.
  • Derivation of upper and lower bounds on distributed entanglement.

Main Results:

  • Identified key properties of initial resource states enabling entanglement distribution.
  • Proved necessary and sufficient conditions for Bell-diagonal states to act as entanglement resources.
  • Established bounds on the amount of entanglement that can be distributed under these conditions.

Conclusions:

  • Entanglement can be generated between separated parties even from initially separable states.
  • The structure of Bell-diagonal states dictates their utility in entanglement distribution.
  • This work provides a fundamental understanding of entanglement distribution resources.