Universal quantum computation with quantum-dot cellular automata in decoherence-free subspace. (English) Zbl 1161.81009
Summary: We investigate the possibility to have electron-pairs in decoherence-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to deterministically carry out a universal quantum computation with high-fidelity. We show that our QCA device with electrons tunneling in two dimensions is very suitable for DFS encoding, and argue that our design favors a scalable quantum computation robust to collective dephasing errors.
MSC:
81P68 | Quantum computation |
82D20 | Statistical mechanics of solids |
68Q80 | Cellular automata (computational aspects) |