Robust and Reliable Transfer of a Quantum State Through a Spin Chain

TL;DR

This paper introduces protocols for high-fidelity quantum state transfer through spin chains, utilizing simple encoding and local memory to enhance reliability over longer distances.

Contribution

It proposes novel protocols that improve quantum state transfer fidelity and reliability using minimal encoding and auxiliary techniques.

Findings

High fidelity transfer achieved with two-spin encoding

Fidelity decreases slowly with chain length

Local memory and dual chains enhance reliability

Abstract

We present several protocols for reliable quantum state transfer through a spin chain. We use a simple two-spin encoding to achieve a remarkably high fidelity transfer for an arbitrary quantum state. The fidelity of the transfer also decreases very slowly with increasing chain length. We find that we can also increase the reliability by taking advantage of a local memory and/or confirm transfer using a second spin-chain.