A silicon singlet-triplet qubit driven by spin-valley coupling

Understand

Spin-orbit effects, inherent to electrons confined in quantum dots at a silicon heterointerface, provide a means to control electron spin qubits without the added complexity of on-chip, nanofabricated micromagnets or nearby coplanar striplines.

• Here, we demonstrate a novel singlet-triplet qubit operating mode that can drive qubit evolution at frequencies in excess of 200 MHz.
• This approach offers a means to electrically turn on and off fast control, while providing high logic gate orthogonality and long qubit dephasing times.
• We utilize this operational mode for dynamical decoupling experiments to probe the charge noise power spectrum in a silicon metal-oxide-semiconductor double quantum dot.