Methods for transverse and longitudinal spin-photon coupling in silicon quantum dots with intrinsic spin-orbit effect

TL;DR

This paper explores theoretical methods for achieving strong transverse and longitudinal spin-photon coupling in silicon quantum dots using intrinsic spin-orbit effects, aiming to enhance scalable quantum computing architectures.

Contribution

It introduces a novel coupling approach leveraging intrinsic spin-orbit interaction in SiMOS qubits, avoiding external micromagnets and improving scalability.

Findings

Strong coupling regime achievable in transverse scheme

Feasibility of longitudinal coupling with AC modulation

Enhanced prospects for scalable quantum computing

Abstract

In a full-scale quantum computer with a fault-tolerant architecture, having scalable, long-range interaction between qubits is expected to be a highly valuable resource. One promising method of achieving this is through the light-matter interaction between spins in semiconductors and photons in superconducting cavities. This paper examines the theory of both transverse and longitudinal spin-photon coupling and their applications in the silicon metal-oxide-semiconductor (SiMOS) platform. We propose a method of coupling which uses the intrinsic spin-orbit interaction arising from orbital degeneracies in SiMOS qubits. Using theoretical analysis and experimental data, we show that the strong coupling regime is achievable in the transverse scheme. We also evaluate the feasibility of a longitudinal coupling driven by an AC modulation on the qubit. These coupling methods eschew the requirement for an external micromagnet, enhancing prospects for scalability and integration into a large-scale quantum computer.