Geometric phase of a quantum dot system in nonunitary evolution

TL;DR

This paper studies how environmental effects influence the geometric phase of a quantum dot system, which is relevant for fault-tolerant quantum computing with electron qubits.

Contribution

It provides a calculation of the geometric phase in a realistic quantum dot model considering nonunitary evolution due to decoherence.

Findings

Environmental parameters significantly affect the geometric phase.

The model demonstrates the robustness of geometric phase under certain conditions.

Results support quantum dots as promising qubits for quantum computing.

Abstract

Practical implementations of quantum computing are always done in the presence of decoherence. Geometric phase is useful in the context of quantum computing as a tool to achieve fault tolerance. Recent experimental progresses on coherent control of single electron have suggested that electron in quantum dot systems is a promising candidate of qubit in future quantum information processing devices. In this paper, by considering a feasible quantum dot model, we calculate the geometric phase of the quantum dot system in nonunitary evolution and investigate the effect of environment parameters on the phase value.