Generating remote entanglement via disentangling operations

TL;DR

This paper introduces a deterministic, local-operation-based protocol for generating maximally entangled states between remote quantum systems without classical communication, potentially enhancing quantum communication and cryptography.

Contribution

It presents a novel protocol for remote entanglement generation that does not require classical communication, unlike previous methods.

Findings

Protocol is deterministic and uses only local operations.

No classical communication needed for entanglement generation.

Potential applications in quantum key distribution and decoherence protection.

Abstract

Shared entanglement between spatially separated systems is an essential resource for quantum information processing including long-distance quantum cryptography and teleportation. While purification protocols for mixed distributed entangled quantum states exist, it is not clear how to optimally distribute entanglement to remote locations. Here, we describe a deterministic protocol for generating a maximally entangled state between remote locations that only uses local operations on qubits, and requires no classical communication between the separated parties. The procedure may provide protection from decoherence before the entanglement is "activated," and could be useful for quantum key distribution.