Researchers Extend Silicon Qubit Coherence to 67 Microseconds

Silicon-based spin qubits were formerly limited by how readily charge noise translates into fluctuations in qubit frequency, restricting coherence times. Positioning a qubit near a ‘sweet spot’, an area with minimised stray field gradients, now sharply enhances coherence. Improved coherence within silicon-based quantum bits, tiny components storing information, results from carefully controlling their location on a microchip. Specifically, positioning these spin qubits at ‘sweet spots’ minimises disruption from external electrical disturbances; this precise placement extended reliable data holding time from…