Universal quantum computation with quantum-dot cellular automata in decoherence-free subspace
Zhenyu Xu, Mang Feng, Wei-Min Zhang · Quantum Information and Computation · 2008
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.