Turing instability in quantum activator–inhibitor systems

• Published in: Scientific reports Vol. 12; no. 1; p. 15573
• Main Authors: Kato, Yuzuru, Nakao, Hiroya
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group 16.09.2022; Nature Publishing Group UK; Nature Portfolio
• Subjects: Asymmetry; Evolution; Instability; Optics; Quantum dots; Symmetry
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-022-19010-0

Abstract Turing instability is a fundamental mechanism of nonequilibrium self-organization. However, despite the universality of its essential mechanism, Turing instability has thus far been investigated mostly in classical systems. In this study, we show that Turing instability can occur in a quantum dissipative system and analyze its quantum features such as entanglement and the effect of measurement. We propose a degenerate parametric oscillator with nonlinear damping in quantum optics as a quantum activator–inhibitor unit and demonstrate that a system of two such units can undergo Turing instability when diffusively coupled with each other. The Turing instability induces nonuniformity and entanglement between the two units and gives rise to a pair of nonuniform states that are mixed due to quantum noise. Further performing continuous measurement on the coupled system reveals the nonuniformity caused by the Turing instability. Our results extend the universality of the Turing mechanism to the quantum realm and may provide a novel perspective on the possibility of quantum nonequilibrium self-organization and its application in quantum technologies.