How to exploit local information when distilling entanglement

TL;DR

This paper introduces new entanglement distillation protocols that leverage local information in noisy mixed states, achieving higher fidelities faster and significantly improving yields, with applications in distributed quantum computing.

Contribution

The authors develop novel protocols that utilize local information in mixed states, outperforming existing methods in efficiency and yield.

Findings

Protocols converge to higher fidelities faster.

Yield improvements of 10-fold or more when local information is significant.

Applicable to distributed quantum computing with minimal qubits.

Abstract

Distillation protocols enable generation of high quality entanglement even in the presence of noise. Existing protocols ignore the presence of local information in mixed states produced from some noise sources such as photon loss, amplitude damping or thermalization. We propose new protocols that exploit local information in mixed states. Our protocols converge to higher fidelities in fewer rounds, and when local information is significant one of our protocols consistently improves yields by 10 fold or more. We demonstrate that our protocols can be compacted into an entanglement-pumping scheme, allowing quantum computation in distributed systems with a few qubits per location.