Keldysh formalism for multiple parallel worlds

M. Ansari, Y. V. Nazarov*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


We present a compact and self-contained review of the recently developed Keldysh formalism for multiple parallel worlds. The formalism has been applied to consistent quantum evaluation of the flows of informational quantities, in particular, to the evaluation of Renyi and Shannon entropy flows. We start with the formulation of the standard and extended Keldysh techniques in a single world in a form convenient for our presentation. We explain the use of Keldysh contours encompassing multiple parallel worlds. In the end, we briefly summarize the concrete results obtained with the method.

Original languageEnglish
Pages (from-to)389-401
Number of pages13
JournalJournal of Experimental and Theoretical Physics
Issue number3
Publication statusPublished - 2016


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