Work

Exchange-only spin-orbit qubits in silicon and germanium

Year: 2026

Type: article

Abstract: The strong spin-orbit interaction in silicon and germanium hole quantum dots enables all-electric microwave control of single spins but is unsuited for multispin exchange-only qubits that rely on scalable discrete signals to suppress crosstalk and heating effects in large quantum processors. Here, we propose an exchange-only spin-orbit qubit that utilizes spin-orbit interactions to implement qubit gates and keeps the beneficial properties of the original encoding. Our encoding is robust to significant local variability in hole spin properties and, because it operates with two degenerate states, it eliminates the need for the rotating frame, avoiding the technologically demanding constraints of fast clocks and precise signal calibration. Unlike current exchange-only qubits, which require complex multistep sequences prone to leakage, our qubit design enables low-leakage two-qubit gates in a single step, addressing critical challenges in scaling spin qubits.

Source: Physical Review Applied

DOI: 10.1103/nl35-6886

Authors: Stefano Bosco, Maximilian Rimbach-Russ

Institutions: QuTech, Delft University of Technology

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Army Research Office

Awards: G902143110, Probing local properties for novel spin-qubit operations