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Science, 30 August 1996:
"Enforcing Coherent Evolution in Dissipative Quantum
Cirac, Pellizzari, Zoller
[Precis] The major obstacle to the preparation and
manipulation of many-particle entangled states is
decoherence due to the coupling of the system to the
environment. A scheme to correct for the effects of
decoherence and enforce coherent evolution in the
system dynamics is described and illustrated for the
particular case of the ion-trap quantum computer.
The preparation and manipulation of N-particle entangled
states is fundamental to the investigation of basic
aspects of quantum mechanics and is the basis of
applications such as quantum computation, teleportation,
cryptography. and spectroscopy.
The error correction schemes proposed so far have focused
on preserving a given entangled state (memory errors). We
introduce a method to correct for the effects of
decoherence in the dynamical proccss of preparation and
modification of entangled states (gate errors). We
illustrate our scheme in the context of the ion-trap QC.
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