High fidelity readout scheme for rare-earth solid state quantum computing

TL;DR

This paper introduces a high fidelity readout method for rare-earth-ion-doped quantum computers, reducing errors and enhancing robustness, with potential for scalable quantum information processing.

Contribution

It presents a novel readout scheme using different ion species, significantly lowering error rates and demonstrating robustness and scalability in solid-state quantum systems.

Findings

Readout error reduced by over an order of magnitude.

Scheme is robust against detection efficiency variations.

Predicted high fidelity for CNOT gate in rare-earth systems.

Abstract

We propose and analyze a high fidelity readout scheme for a single instance approach to quantum computing in rare-earth-ion-doped crystals. The scheme is based on using different species of qubit and readout ions, and it is shown that by allowing the closest qubit ion to act as a readout buffer, the readout error can be reduced by more than an order of magnitude. The scheme is shown to be robust against certain experimental variations, such as varying detection efficiencies, and we use the scheme to predict the expected quantum fidelity of a CNOT gate in these solid state systems. In addition, we discuss the potential scalability of the protocol to larger qubit systems. The results are based on parameters which we believed are experimentally feasible with current technology, and which can be simultaneously realized.