Montina A, Arecchi F T
Dipartimento di Fisica, Università di Firenze, Via Sansone 1, 50019 Sesto Fiorentino (FI), Italy.
Phys Rev Lett. 2008 Mar 28;100(12):120401. doi: 10.1103/PhysRevLett.100.120401. Epub 2008 Mar 25.
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.
对于与线性热库耦合的量子系统，众所周知退相干率会随温度升高，而对于不同的库动力学情况，这种关系不再成立。通过一个简单的经典非线性库以及一个量子自旋 - 玻色子模型可以表明这一点。这种反常效应是由于库谱轮廓的温度依赖性。在第二个模型的情况下，提供了与量子芝诺效应的联系。通过升高温度来降低退相干对于量子计算机的设计可能具有重要意义。
