Maintaining coherence in Quantum Computers

Details Maintaining coherence in Quantum Computers Maintaining coherence in Quantum Computers

1994-06-09

arxiv.org/abs/hep-th/9406058v1

Physics

High Energy Physics

High Energy Physics - Theory

13 pages

Scientific paper

10.1103/PhysRevA.51.992

The effect of the inevitable coupling to external degrees of freedom of a quantum computer are examined. It is found that for quantum calculations (in which the maintenance of coherence over a large number of states is important), not only must the coupling be small but the time taken in the quantum calculation must be less than the thermal time scale, $\hbar/k_B T$. For longer times the condition on the strength of the coupling to the external world becomes much more stringent.

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