Preserving coherence in quantum computation by pairing quantum bits

Details Preserving coherence in quantum computation by pairing quantum bits Preserving coherence in quantum computation by pairing quantum bits

1997-03-22

arxiv.org/abs/quant-ph/9703040v2

Phys.Rev.Lett.79:1953-1956,1997

Physics

Quantum Physics

12 pages, Latex, some correction in the reference and introduction. Jour-ref: Phys. Rev. Lett. 79, 1953, 1997

Scientific paper

10.1103/PhysRevLett.79.1953

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.

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