Thermal Pure Quantum States at Finite Temperature [PDF]
Sho Sugiura, Akira ShimizuAn equilibrium state can be represented by a pure quantum state, which we call a thermal pure quantum state (TPQ). We propose a new class of TPQs and a simple method for obtaining them. A single TPQ in this class suffices for calculating all statistical-mechanical properties, including correlation functions and genuine thermodynamic variables, of a quantum system at finite temperature.View original: http://arxiv.org/abs/1112.0740
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