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Updated: Dec 27, 2025
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.9K
Multipartite quantum entanglement creation for distant stationary systems.
Optics Express
|March 4, 2020
Summary
We developed new quantum protocols to create multipartite entangled states, specifically Greenberger-Horne-Zeilinger (GHZ) and W states, for distant stationary qubits. These methods enhance efficiency and maintain fidelity despite system imperfections.
Area of Science:
- Quantum Information Science
- Quantum Entanglement
- Quantum Computing
Background:
- Multipartite entangled states like GHZ and W states are crucial for advanced quantum information processing.
- System nonuniformity and photon scattering typically degrade entanglement fidelity and efficiency.
Purpose of the Study:
- To present efficient protocols for generating multipartite Greenberger-Horne-Zeilinger (GHZ) and W states of distant stationary qubits.
- To overcome limitations imposed by system imperfections and non-ideal photon scattering in entanglement creation.
Main Methods:
- Utilizing linear optical elements to convert system errors into heralded loss.
- Employing parallel creation for GHZ states to boost generation efficiency.
- Using two-spatial-mode interferences for W state protocols to eliminate 'which path' information.
Main Results:
- Fidelity of generated multipartite entangled states remains unchanged, with only efficiency affected by errors.
- GHZ state generation efficiency is considerably increased through a parallel approach.
- W state generation efficiency for N qubits is independent of N, avoiding exponential decrease.
Conclusions:
- The proposed protocols offer robust methods for creating high-fidelity multipartite entangled states.
- These advancements are vital for practical quantum information processing with distant stationary qubits.
- The efficiency improvements pave the way for scalable quantum networks and computing.
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