Studies of Short-Time Decoherence for Evaluation of Quantum Computer Designs

TL;DR

This paper reviews short-time decoherence analysis in quantum systems, emphasizing non-Hermitian interactions and low-temperature effects, providing insights for evaluating quantum computer designs.

Contribution

It introduces a non-Markovian short-time approximation method tailored for quantum computing systems with non-Hermitian system-environment interactions.

Findings

Decoherence onset evaluated at low temperatures.

Approach complements Markovian models.

Application to spin-boson heat bath model.

Abstract

We review our recent results on short time approximations, with emphasis on applications for which the system-environment interactions involve a general non-Hermitian system operator and its conjugate. We evaluate the onset of decoherence at low temperatures in open quantum systems. The developed approach is complementary to Markovian approximations and appropriate for evaluation of quantum computing schemes. Example of a spin system coupled to a bosonic heat bath is discussed.