On 'Schrödinger's cat' fringes

V.L. Gorshenin^a, b, B.N. Nougmanov^a, b, F.Ya. Khalili^†^b
^aMoscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation
^bInternational Center for Quantum Optics and Quantum Technologies (the Russian Quantum Center), Skolkovo Innovation Center, Bolshoi Boulevard, Building 30, Block 1, 3rd floor, sectors G3, G7, Moscow, Moscow Region, 121205, Russian Federation

Non-Gaussian quantum states whose Wigner functions can take negative values are important both for fundamental tests of quantum physics and for the quantum information technologies that have been under active development recently. A typical example of a non-Gaussian state is the so-called Schrödinger's cat state. Its very interesting feature is that its 'classical' part (two Gaussian maxima) is geometrically separated from the 'nonclassical' part (interference fringes). In this paper, several methodological issues related to these fringes are considered.

Keywords: Schrödinger's cat, Wigner functions, non-Gaussian states
PACS: 03.65.Ta, 03.65.Ud, 42.50.−p (all)
DOI: 10.3367/UFNe.2024.05.039686
URL: https://ufn.ru/en/articles/2024/9/i/
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2024PhyU...67..938G
Citation: Gorshenin V L, Nougmanov B N, Khalili F Ya "On 'Schrödinger's cat' fringes" Phys. Usp. 67 938–942 (2024)

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Received: 22nd, February 2024, revised: 25th, April 2024, accepted: 28th, May 2024

Оригинал: Горшенин В Л, Нугманов Б Н, Халили Ф Я «О полосах "кота Шрёдингера"» УФН 194 994–998 (2024); DOI: 10.3367/UFNr.2024.05.039686