Universal quantum computation with electronic qubits in decoherence-free subspace

Details Universal quantum computation with electronic qubits in decoherence-free subspace Universal quantum computation with electronic qubits in decoherence-free subspace

2007-10-22

arxiv.org/abs/0710.3996v1

Quantum Information and Computation 8 (2008) 96-105

Physics

Quantum Physics

14 pages, 3 figures

Scientific paper

We investigate how to carry out universal quantum computation deterministically with free electrons in decoherence-free subspace by using polarizing beam splitters, charge detectors, and single-spin rotations. Quantum information in our case is encoded in spin degrees of freedom of the electron-pairs which construct a decoherence-free subspace. We design building blocks for two noncommutable single-logic-qubit gates and a logic controlled phase gate, based on which a universal and scalable quantum information processing robust to dephasing is available in a deterministic way.

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