Spin Star as Switch for Quantum Networks

TL;DR

This paper demonstrates that a permanently coupled spin star can act as a quantum network switch, enabling selective quantum state transfer between nodes by adjusting local potentials, thus broadening quantum communication applications.

Contribution

It extends spin-chain engineering to star network topologies, showing that a spin star can function as a switch for quantum state transfer through local potential adjustments.

Findings

A spin star can serve as a quantum switch for state transfer.

Selective transfer is achieved by varying local potentials.

Application to general quantum networks is possible.

Abstract

Quantum state transfer is an important task in quantum information processing. It is known that one can engineer the couplings of a one-dimensional spin chain to achieve the goal of perfect state transfer. To leverage the value of these spin chains, a spin star is potentially useful for connecting different parts of a quantum network. In this work, we extend the spin-chain engineering problem to the problems with a topology of a star network. We show that a permanently coupled spin star can function as a network switch for transferring quantum states selectively from one node to another by varying the local potentials only. Together with one-dimensional chains, this result allows applications of quantum state transfer be applied to more general quantum networks.