Twisted Bilayer Materials as a Promising Platform for Solid-State Qubits.

Qubits are the fundamental units in quantum computing, quantum communication, and sensing. In current platforms, such as cold atoms, superconducting circuits, point defects, and semiconductor quantum dots, each qubit requires individual preparation, making identical replication a challenging task. Constructing and maintaining stable, scalable qubits remains a formidable challenge. The race to identify the best one remains inconclusive. Our Letter introduces twisted bilayer materials as a promising platform for qubits due to their tunability, natural patterns, and extensive materials library. Our large-scale first-principles calculations reveal that the moiré superlattices have identical and localized states, akin to the discrete energy levels of an alkali atom. Existing experimental techniques allow for individual initialization, manipulation, and readout. The vast array of 2D materials provides a multitude of potential candidates for qubit exploration. Because of their inherent scalability and uniformity, our proposed qubits present significant advantages over conventional solid-state qubit systems.