Keldysh formalism for multiple parallel worlds

Abstract

We present here a compact and self-contained review of 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 evaluation of Renyi and Shannon entropy flows. We start with the formulation of standard and extended Keldysh technique in single world in a form convenient for our presentation. We explain the use of Keldysh contours encompassing multiple parallel worlds In the end, we shortly summarize the concrete results obtained with the method.

Special JETP issue dedicated to 85th anniversary of Prof. L. V. Keldysh. 30 pages, 6 figures

References in corpus (3)

• Quantum Noise as an Entanglement Meter
• Exact correspondence between Renyi entropy flows and physical flows
• Rényi entropy flows from quantum heat engines

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