Photon-assisted quantum state transfer and entanglement generation in spin chains

TL;DR

This paper introduces a protocol for transferring quantum states and generating entanglement between distant, energy-different spin qubits using a driven spin chain, leveraging virtual photon transitions for effective communication.

Contribution

It presents a novel method for quantum state transfer and entanglement in spin chains with energy mismatched qubits, utilizing external driving and virtual photon processes.

Findings

Successful state transfer between distant qubits.

Entanglement generation via virtual photon transitions.

Robustness against energy mismatch.

Abstract

We propose a protocol for state transfer and entanglement generation between two distant spin qubits (sender and receiver) that have different energies. The two qubits are permanently coupled to a far off-resonant spin-chain, and the qubit of the sender is driven by an external field, which provides the energy required to bridge the energy gap between the sender and the receiver. State transfer and entanglement generation are achieved via virtual single-photon and multi-photon transitions to the eigenmodes of the channel.