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quant-ph2003
Theory of quantum Loschmidt echoes
Tomaz Prosen, Thomas H. Seligman, Marko Znidaric
In this paper we review our recent work on the theoretical approach to quantum Loschmidt echoes, i.e. various properties of the so called echo dynamics -- the composition of forwar…
quant-ph2003
Estimating purity in terms of correlation functions
Tomaz Prosen, Thomas H. Seligman, Marko Znidaric
We prove a rigorous inequality estimating the purity of a reduced density matrix of a composite quantum system in terms of cross-correlation of the same state and an arbitrary prod…