QUANTUM INFORMATION SCIENCE

Quantum entanglement and phase control of nonclassical electromagnetic fields interacting with atomic systems

D. V. Popolitova^a, O. V. Tikhonova<sup>ab

a</sup> Moscow State University, Moscow, 119991 Russia
^b Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119234 Russia

Abstract: The interaction of a three-level atom with two quantum field modes has been studied analytically. Strong quantum entanglement between individual parts of the considered multipartite system has been revealed and the possibility of its controlled variation has been demonstrated. Methods of the transmission and exchange of phase information between field modes, as well as of direct measurement of the phase characteristics of an unknown state of the input field, have been developed on the basis of quantum entanglement between initially independent quantum fields interacting with an atom.

Received: 08.10.2020
Revised: 13.10.2020
Accepted: 14.10.2020

DOI: 10.31857/S1234567820220139

 English version: Journal of Experimental and Theoretical Physics Letters, 2020, 112:10, 666–672

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