Quantum state transfer and time-dependent disorder in Quantum Chains

TL;DR

This paper reviews quantum state transfer in spin chains and introduces a new finding on the stability of these schemes under time-dependent disorder, highlighting their potential robustness in noisy quantum environments.

Contribution

It presents a novel analysis of the stability of quantum state transfer schemes against time-dependent disorder in quantum chains.

Findings

Quantum chains can reliably transfer states despite time-dependent disorder.

Existing schemes are stable against approximately constant disorder.

The study extends understanding of noise resilience in quantum communication channels.

Abstract

One of the most basic tasks required for Quantum Information Technology is the ability to connect different components of a Quantum Computer by quantum wires that obey the superposition principle. Since superpositions can be very sensitive to noise this turns out to be already quite difficult. Recently, it was suggested to use chains of permanently coupled spin-1/2 particles (quantum chains) for this purpose. They have the advantage that no external control along the wire is required during the transport of information, which makes it possible to isolate the wire from sources of noise. We first give an introduction to basic quantum state transfer and review existing advanced schemes by other authors. We then show a new result that demonstrates the stability of the scheme [1] against disorder that is approximately constant during one application of the channel, but time-dependent with respect to multiple applications.