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Updated: Jun 3, 2026
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Modular entanglement.
Giulia Gualdi1, Salvatore M Giampaolo, Fabrizio Illuminati
1Dipartimento di Matematica e Informatica, Università degli Studi di Salerno, Via Ponte don Melillo, I-84084 Fisciano (SA), Italy.
Physical Review Letters
|March 17, 2011
Summary
We introduce modular entanglement, the quantum correlation between endpoints in modular systems. This entanglement scales with system size and is key for quantum communication technologies like repeaters.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
Background:
- Entanglement is a fundamental quantum resource crucial for quantum technologies.
- Understanding entanglement in complex or composite systems is an ongoing challenge.
Purpose of the Study:
- To introduce and define the concept of modular entanglement.
- To investigate the scaling properties and underlying mechanisms of modular entanglement.
- To explore potential applications in quantum communication.
Main Methods:
- Theoretical analysis of modular systems with interacting moduli.
- Investigation of entanglement scaling in the thermodynamic limit.
- Analysis of entanglement onset in distant, noninteracting quantum systems.
Main Results:
- Modular entanglement is established between the endpoints of modular systems.
- End-to-end modular entanglement scales in the thermodynamic limit.
- Entanglement rapidly saturates with the number of constituent moduli.
- Mechanisms for entanglement generation between distant, noninteracting systems are clarified.
Conclusions:
- Modular entanglement provides a framework for understanding entanglement in composite quantum systems.
- The findings offer insights into optimizing entanglement for quantum repeaters and distribution.
- This work paves the way for advanced quantum communication protocols.
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