Measurement-based approach to entanglement generation in coupled quantum dots

TL;DR

This paper explores a measurement-based method for generating entanglement in coupled quantum dots, analyzing environmental impacts and proposing experimental verification techniques to improve quantum computation reliability.

Contribution

It generalizes a parity measurement scheme for quantum dots and provides a detailed analysis of error sources and an experimental verification approach.

Findings

Error sources significantly affect entanglement fidelity

Non-ideal detectors reduce measurement accuracy

Proposed verification method enhances experimental reliability

Abstract

Measurements provide a novel mechanism for generating the entanglement resource necessary for performing scalable quantum computation. Recently, we proposed a method for performing parity measurements in a coupled quantum dot system. In this paper we generalise this scheme and perform a comprehensive analytic and numerical study of environmental factors. We calculate the effects of possible error sources including non-ideal photon detectors, ineffective spin-selective excitation and dot distinguishability (both spatial and spectral). Furthermore, we present an experimental approach for verifying the success of the parity measurement.