Electrically Tunable Valley-Based Qubits in Moiré Quantum Dots

The search for scalable, electrically controlled qubits remains a central challenge in quantum technology. We introduce gate-defined moir\'e quantum dots as a promising platform for valley-based qubits. Moir\'e engineering resolves the central conflict of valley physics: momentum-space separation protects the states, while the enlarged moir\'e length scale allows smooth gates to mix them controllably. Dot geometry and confinement strength program valley hybridization, while a displacement field controls detuning, providing two noncommuting electrostatic axes for qubit control.