1,088 research outputs found
Decoherence without Dissipation
That decoherence can take place in the presence of energy conservation seems
to be a poorly known fact. That lack of knowledge has for example bedevilled
the discussion of the "black hole information" problem. I present a simple
model which illustrates such energy free decoherence.Comment: 4 pages-- To appear in Phil Trans Roy Soc in special issue on
Decoherence, ed. A. Haga
Maintaining coherence in Quantum Computers
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, . For longer
times the condition on the strength of the coupling to the external world
becomes much more stringent.Comment: 13 page
Inappropriateness of the Rindler quantization
It is argued that the Rindler quantization is not a correct approach to study
the effects of acceleration on quantum fields. First, the "particle"-detector
approach based on the Minkowski quantization is not equivalent to the approach
based on the Rindler quantization. Second, the event horizon, which plays the
essential role in the Rindler quantization, cannot play any physical role for a
local noninertial observer.Comment: 3 pages, accepted for publication in Mod. Phys. Lett.
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