Error prevention scheme with two pairs of qubits

Details Error prevention scheme with two pairs of qubits Error prevention scheme with two pairs of qubits

2002-07-10

arxiv.org/abs/quant-ph/0207063v1

Physical Review A 66, 034301 (2002)

Physics

Quantum Physics

accepted for publication in Physical Review A

Scientific paper

10.1103/PhysRevA.66.034301

A scheme is presented for protecting one-qubit quantum information against decoherence due to a general environment and local exchange interactions. The scheme operates essentially by distributing information over two pairs of qubits and through error prevention procedures. In the scheme, quantum information is encoded through a decoherence-free subspace for collective phase errors and exchange errors affecting the qubits in pairs; leakage out of the encoding space due to amplitude damping is reduced by quantum Zeno effect. In addition, how to construct decoherence-free states for n-qubit information against phase and exchange errors is discussed.

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