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arXiv 1603.01546quant-ph
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二维拓扑色码的热稳定性

Thermal stability of two-dimensional Topological Color Code

Razieh Mohseninia

摘要:

研究了热浴条件下拓扑色码的热稳定性。研究了Born-Markov近似下弱耦合极限下观测量的Lindblad演化。观测量的自关联函数被用作热稳定性的品质因数。我们证明了所有的可观测量的自关联函数随时间呈指数衰减。通过找到一个下界的衰减率,这是一个常数独立的系统的大小,我们表明,拓扑色码是不稳定的热波动浴在有限的温度下,即使它是稳定的,在T=0对局部量子扰动。

英文摘要:

Thermal stability of the Topological Color Code in presence of a thermal bath is studied. We study the Lindblad evolution of the observables in the weak coupling limit of the Born-Markov approximation. The auto-correlation functions of the observables are used as a figure of merit for the thermal stability. We show that all of the observables auto-correlation functions decay exponentially in time. By finding a lower bound of the decay rate, which is a constant independent of the system size, we show that the Topological Color Code is unstable against thermal fluctuations from the bath at finite temperature, even though it is stable at T=0 against local quantum perturbations.

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