Fast quantum gates for exchange-only qubits using simultaneous exchange pulses

Develops shorter exchange-only gate constructions using simultaneous exchange and experimentally demonstrates a single-pulse X rotation.

Key Results

Replaces selected serial one-qubit sequences with simultaneous-exchange pulses.
Demonstrates a single-pulse X rotation in a SiGe triple-dot device.
Shows how simultaneous pulses can shorten subsequences inside encoded two-qubit gates.