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Updated: Jul 13, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Random bipartite entanglement from W and W-like states.
1Center for Quantum Information and Quantum Control, Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada.
We developed a new protocol to distill more entangled pairs (Einstein-Podolsky-Rosen pairs) from W states. This method achieves a higher overall distillation rate for random pairs than for specific pairs.
Area of Science:
- Quantum Information Science
- Quantum Entanglement
- Quantum Communication
Background:
- Tripartite W states are a key resource in quantum information.
- Distilling entangled states is crucial for quantum communication protocols.
Purpose of the Study:
- To develop a protocol for distilling maximally entangled bipartite states from W states.
- To compare the total distillation rate with rates for specified pairs.
Main Methods:
- Utilizing a tripartite W state.
- Implementing a novel distillation protocol.
- Analyzing the total distillation rate (E(t)(infinity)).
Main Results:
- The protocol achieves an asymptotic distillation rate of 1 Einstein-Podolsky-Rosen (EPR) pair per W state for random pairs.
- This rate is higher than the previously known optimal rate of 0.92 EPR pairs per W for specified pairs.
- Demonstrated a tradeoff between overall distillation rate and the distribution of entangled pairs.
Conclusions:
- The new protocol offers a higher overall rate for distilling EPR pairs from W states.
- There's a potential for states with high total distillation but low specific distillable entanglement.
- This work highlights new possibilities in quantum state distillation and resource management.
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