Heralded optical entanglement distribution via lossy quantum channels: a comparative study

Area of Science:

• Quantum Information Science
• Quantum Communication
• Quantum Optics

Background:

• Quantum entanglement is vital for quantum technologies, but its distribution is hindered by photon losses in optical channels.
• Heralded schemes enhance entanglement generation reliability by detecting ancillary photons.
• Current limitations in entanglement distribution distance and capacity due to channel losses necessitate new strategies.

Purpose of the Study:

• To propose and analyze three heralded schemes for distributing multipartite Greenberger-Horne-Zeilinger (GHZ) states over lossy quantum channels.
• To compare these schemes based on network architecture, photon source requirements, success probabilities, and heralding efficiency.
• To provide insights for designing robust heralded circuits for quantum information processing.

Main Methods:

• Development of three distinct heralded schemes for multipartite GHZ state distribution.
• Qualitative analysis of network architectures (centralized vs. decentralized) and photon source requirements (Bell states vs. single-photons).
• Quantitative evaluation of success probabilities and heralding efficiency, considering practical implementation and theoretical performance.

Main Results:

• Each proposed scheme demonstrates unique trade-offs in performance and applicability.
• Decentralized schemes are advantageous for balanced information distribution in larger networks.
• Centralized schemes may offer superior performance for smaller-scale quantum networks.

Conclusions:

• The choice of heralded scheme depends on specific application requirements, including the number of parties, channel distance, and security needs.
• The study offers valuable guidance for optimizing heralded quantum state distribution in the presence of channel losses.
• This research contributes to the development of resilient quantum communication networks and technologies.