Quantum decoherence reduction by increasing the thermal bath temperature.
The well-known increase of the decoherence rate with the temperature, for a quantum system coupled to a linear thermal bath, no longer holds for a different bath dynamics. This is shown by means of a simple classical nonlinear bath, as well as a quantum spin-boson model. The anomalous effect is due to the temperature dependence of the bath spectral profile. In the case of the second model, a link with the quantum Zeno effect is provided. The decoherence reduction via the temperature increase can be relevant for the design of quantum computers.
Montina
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Dipartimento di Fisica, Università di Firenze, Via Sansone 1, 50019 Sesto Fiorentino (FI), Italy.
Arecchi
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