Preserving coherence in quantum computation by pairing quantum bits

Abstract

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.

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

References in corpus (1)

• Quantum Computers and Dissipation

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