Preserving coherence in quantum computation by pairing quantum bits
量子物理
2009-01-23 v2
摘要
A scheme is proposed for protecting quantum states from both independent decoherence and cooperative decoherence. The scheme operates by pairing each qubit (two-state quantum system) with an ancilla qubit and by encoding the states of the qubits into the corresponding coherence-preserving states of the qubit-pairs. In this scheme, the amplitude damping (loss of energy) is prevented as well as the phase damping (dephasing) by a strategy called the free-Hamiltonian-elimination We further extend the scheme to include quantum gate operations and show that loss and decoherence during the gate operations can also be prevented.
引用
@article{arxiv.quant-ph/9703040,
title = {Preserving coherence in quantum computation by pairing quantum bits},
author = {Lu-Ming Duan and Guang-Can Guo},
journal= {arXiv preprint arXiv:quant-ph/9703040},
year = {2009}
}
备注
12 pages, Latex, some correction in the reference and introduction. Jour-ref: Phys. Rev. Lett. 79, 1953, 1997