Increasing distillable key rate from bound entangled states by using local filtration

TL;DR

This paper demonstrates that local filtration operations can enhance the distillable key rate in quantum key distribution by transforming bound entangled states into more useful states, including discovering new key-distillable bound entangled states.

Contribution

It introduces a method to increase the utility of bound entangled states for QKD through local filtering, revealing new key-distillable bound entangled states.

Findings

Local filtering enhances key rate in bound entangled states.

Three examples show increased one-way distillable key rate.

New bound entangled states with key distillability discovered.

Abstract

We show the enhancement of distillable key rate for quantum key distribution(QKD), by local filtering, for several bound entangled states. Through our work it becomes evident that the local filtration operations, while transforming one bound entangled state to another, have the potential to increase the utility of the new state for QKD. We demonstrate three examples of `one way distillable key rate' enhancement by local filtering and in this process, discover new bound entangled states which are key distillable.