Study of decoherence of a superposition of macroscopic quantum states by means the consideration of a multimode state of a Schrödinger cat

D. V. Fastovets; Yu. I. Bogdanov; N. A. Bogdanova; V. F. Lukichev

doi:10.1117/12.2624303

30 January 2022 Study of decoherence of a superposition of macroscopic quantum states by means the consideration of a multimode state of a Schrödinger cat

D. V. Fastovets, Yu. I. Bogdanov, N. A. Bogdanova, V. F. Lukichev

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Proceedings Volume 12157, International Conference on Micro- and Nano-Electronics 2021; 1215728 (2022) https://doi.org/10.1117/12.2624303
Event: International Conference on Micro- and Nano-Electronics 2021, 2021, Zvenigorod, Russian Federation

Abstract

Quantum Schrodinger cat states are of great interest in quantum communications and quantum optics. These states are used in various scientific fields such as quantum computing, quantum error correction and high-precision measurements. The analysis of the Schrodinger cat states coherence is an important task for their complete practical application. Our developed approach makes it possible to estimate the coherence of the quantum Schrodinger cat state of arbitrary dimension, as well as to find the interference visibility of the state: an important optical characteristic. The obtained simple quantitative relationship between coherence and the Schmidt number, as well as the developed approach of reducing the multidimensional quantum cat state to a two-mode analog allow us to analyze macroscopic states formed by a large number of modes. Several explicit formulas for the reduced states that arise after measuring of some modes of the considered multimode system are obtained. The research results have significant application and can be used in the development of high-dimensional quantum information processing systems.

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D. V. Fastovets, Yu. I. Bogdanov, N. A. Bogdanova, and V. F. Lukichev "Study of decoherence of a superposition of macroscopic quantum states by means the consideration of a multimode state of a Schrödinger cat", Proc. SPIE 12157, International Conference on Micro- and Nano-Electronics 2021, 1215728 (30 January 2022); https://doi.org/10.1117/12.2624303

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Visibility

Photons

Quantum computing

Superposition

Environmental sensing

Quantum communications

Quantum optics

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