Spin readout of trapped electron qubits

TL;DR

This paper proposes a fast, high-fidelity scheme for reading out the spin state of a single electron qubit in a surface Paul trap using magnetic field gradients, enabling potential all-electric quantum computing.

Contribution

It introduces a novel spin readout method for trapped electron qubits that achieves high fidelity and short measurement times with realistic experimental parameters.

Findings

Measurement time of 25 microseconds

Readout fidelity of 99.7%

Feasible with current experimental setups

Abstract

We propose a scheme to read out the spin of a single electron quantum bit in a surface Paul trap using oscillating magnetic field gradients. The readout sequence is composed of cooling, driving, amplification and detection of the electron's motion. We study the scheme in the presence of noise and trap anharmonicities at liquid helium temperatures. An analysis of the the four procedures shows short measurement times ($25~\mu$s) and high fidelities ($99.7\%$) are achievable with realistic experimental parameters. Our scheme performs the function of fluorescence detection in ion trapping schemes, highlighting the potential to built all-electric quantum computers based on trapped electron spin qubits.