Entangling qubit registers via many-body states of ultracold atoms

TL;DR

This paper proposes a method to entangle distant qubits using many-body states of ultracold atoms, leveraging experimental techniques to transfer and measure entanglement for quantum information processing.

Contribution

It introduces a protocol for entangling spatially-separated qubits via ultracold atom states and discusses experimental measurement of the entanglement transfer.

Findings

Operational entanglement bounds the transferable entanglement.

Protocol enables entanglement transfer using local operations.

Measures for entanglement in the register post-transfer are discussed.

Abstract

Inspired by the experimental measurement of the Renyi entanglement entropy in a lattice of ultracold atoms by Islam et al., [Nature 528, 77 (2015)] we propose a method to entangle two spatially-separated qubits using the quantum many-body state as a resource. Through local operations accessible in an experiment, entanglement is transferred to a qubit register from atoms at the ends of a one-dimensional chain. We compute the operational entanglement, which bounds the entanglement physically transferable from the many-body resource to the register, and discuss a protocol for its experimental measurement. Finally, we explore measures for the amount of entanglement available in the register after transfer, suitable for use in quantum information applications.