AI Article Synopsis
- The valley degree of freedom in materials like silicon and graphene is usually seen as a challenge for electron spin-based quantum computing.
- By harnessing control over valley states, new opportunities for quantum information processing emerge.
- The study demonstrates that combining spin and valley qubits enables universal quantum computing with simple two-qubit gates via exchange interaction, while also allowing for single-qubit operations.
Article Abstract
The valley degree of freedom in the electronic band structure of silicon, graphene, and other materials is often considered to be an obstacle for quantum computing (QC) based on electron spins in quantum dots. Here we show that control over the valley state opens new possibilities for quantum information processing. Combining qubits encoded in the singlet-triplet subspace of spin and valley states allows for universal QC using a universal two-qubit gate directly provided by the exchange interaction. We show how spin and valley qubits can be separated in order to allow for single-qubit rotations.
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| http://dx.doi.org/10.1103/PhysRevLett.113.176801 | DOI Listing |
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