Topics in Quantum Dynamics and Coherence for Quantum Information Processing

TL;DR

This paper reviews theoretical models of quantum systems, focusing on coherence, decoherence, and entanglement in quantum information processing, with applications to semiconductor qubits and challenges in open quantum system modeling.

Contribution

It advances the theoretical understanding of decoherence, quantum noise, and qubit interactions, providing insights for scalable quantum computing and modeling open quantum systems.

Findings

Progress in modeling decoherence and quantum noise.

Investigation of qubit coupling mechanisms.

Evaluation of quantum computing scalability.

Abstract

We outline selected trends and results in theoretical modeling of quantum systems in support of the developing research field of quantum information processing. The resulting modeling tools have been applied to semiconductor materials and nanostructures that show promise for implementation of coherent, controlled quantum dynamics at the level of registers of several quantum bits (qubits), such as spins. Many-body field-theoretical techniques have been utilized to address a spectrum of diverse research topics. Specifically, the theory of decoherence and more generally the origin and effects of quantum noise and the loss of entanglement in quantum dynamics of qubits and several-qubit registers has been advanced. Qubit coupling mechanisms via the indirect exchange interaction have been investigated, and quantum computing designs have been evaluated for scalability. We outline general and specific research challenges, the solution of which will advance the field of modeling "open quantum systems" to further our understanding of how environmental influences affect quantum coherence and its loss during quantum dynamics.