Measurement, Trace, Information Erasure and Entropy

Details Measurement, Trace, Information Erasure and Entropy Measurement, Trace, Information Erasure and Entropy

2003-07-04

arxiv.org/abs/quant-ph/0307026v1

Physics

Quantum Physics

8pages. Reported on the Conference of Chinese Physics Society (2003 autumn):Quantum information conncil house

Scientific paper

We show that both information erasure process and trace process can be realized by projective measurement. And a partial trace operation consists to a projective measurement on a subsystem. We show that a nonunitary operation will destroy the wave-behavior of a particle. We give a quantum manifestation of Maxwell's demon and give a quantum manifestation of the second law of therodynamics. We show that, considering the law of memontum-energy conversation, the evolution of a closed system should be unitary and the von Neumann entropy of the closed quantum system should be least.

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