Single-qubit gates and measurements in the surface acoustic wave quantum computer

TL;DR

This paper models the dynamics of spin qubits in a surface acoustic wave quantum computer, showing how single-qubit operations can be performed with static magnetic fields and providing parameters for future experimental validation.

Contribution

It offers detailed analytic and numerical models of qubit dynamics, highlighting how to implement single-qubit gates and measurements using static magnetic fields in this system.

Findings

Modeling of qubit dynamics including higher-energy orbital excitations

Proposed methods for single-qubit operations using static magnetic fields

Parameter regimes for experimental realization

Abstract

In the surface acoustic wave quantum computer, the spin state of an electron trapped in a moving quantum dot comprises the physical qubit of the scheme. Via detailed analytic and numerical modeling of the qubit dynamics, we discuss the effect of excitations into higher-energy orbital states of the quantum dot that occur when the qubits pass through magnetic fields. We describe how single-qubit quantum operations, such as single-qubit rotations and single-qubit measurements, can be performed using only localized static magnetic fields. The models provide useful parameter regimes to be explored experimentally when the requirements on semiconductor gate fabrication and the nanomagnetics technology are met in the future.