research
The Germanium Spin Qubit Cut Drive Power by 25 Decibels
A flopping-mode design reached 99.76% single-qubit gate fidelity at a five-millitesla field.
Summary
A flopping-mode design reached 99.76% single-qubit gate fidelity at a five-millitesla field.
The experiment delocalized one hole spin across a double quantum dot, combining a charge-noise sweet spot with efficient electric-dipole spin resonance. At an almost in-plane five-millitesla magnetic field, the device used -52 dBm of drive power rather than the roughly -27 dBm cited for conventional planar germanium operation. It achieved up to 99.76% single-qubit gate fidelity with an 88-nanosecond pi rotation, 1.4 microseconds of inhomogeneous coherence, and 130 microseconds under a 32-pulse CPMG sequence. The authors identify a two-photon relaxation process as a route for further optimization.
Why it matters
A flopping-mode design reached 99.76% single-qubit gate fidelity at a five-millitesla field.
Limits and context
No additional limitation was separately recorded.
Key claims
A flopping-mode design reached 99.76% single-qubit gate fidelity at a five-millitesla field.
Evidence: source-2026-09-18-012
Sources
- arXiv preprint 2609.20775arXiv · primary research
Corrections
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