One-Qubit and Two-Qubit Codes in Noisy State Transfer

TL;DR

This paper investigates the impact of decoherence on quantum state transfer in a six-qubit chain, highlighting the advantages of two-qubit encoding for robust quantum information exchange.

Contribution

It introduces a comparative analysis of one-qubit and two-qubit codes under realistic decoherence models in a linear qubit chain.

Findings

Two-qubit encoding often outperforms one-qubit encoding in noisy conditions.

Two-qubit encoding does not require state initialization, offering practical benefits.

Decoherence models significantly affect transfer fidelity.

Abstract

Quantum state transfer is a procedure, which allows to exchange quantum information between stationary qubit systems. It is anticipated that the transfer will find applications in solid-state quantum computing. In this contribution, we discuss the effects of various, physically relevant models of decoherence on a toy model of six qubit linearly coupled by the exchange interaction. In many cases we observe the advantage of the two-qubit encoding, which can be associated with the fact that this encoding does not require the state initialization.