A Physical Explanation for Tilde System in Thermo Field Dynamics

Details A Physical Explanation for Tilde System in Thermo Field Dynamics A Physical Explanation for Tilde System in Thermo Field Dynamics

2001-02-25

arxiv.org/abs/quant-ph/0102127v2

Mod.Phys.Lett.A16:655-662,2001

Physics

Quantum Physics

10 pages. To be published in Modern Physics Letter A

Scientific paper

10.1142/S0217732301003607

For a two-body quantum system, any pure state can be represented by a
biorthogonal expression by means of Schmidt decomposition. Using this in the
composite system which include a thermodynamic system and its surroundings, it
is found that the tilde system in thermo field dynamics is just the
surroundings of the real system.

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