Fundamental constraints on response in classical and quantum out-of-equilibrium systems

• Project/Area Number: 25K00926
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
• Research Institution: Kyoto University
• Principal Investigator: Dechant Andreas 京都大学, 理学研究科, 講師 (50828845)
• Project Period (FY): 2025-04-01 – 2029-03-31
• Project Status: Granted (Fiscal Year 2025)
• Budget Amount: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000); Fiscal Year 2028: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2027: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2026: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2025: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: Response / Fluctuations / Thermodynamics / Entropy / Information

Outline of Research at the Start

We can learn about a physical system either by passively observing it, or by actively perturbing it and observing its response. While in thermal equilibrium, these observations are closeley related, for non-equilibrium systems, such a direct relation does not exist. In this research project, we aim to uncover new relations between passive and active measurements in non-equilibrium systems in the form of inequalities. We will investigate how such relations extend to the quantum regime and demonstrate how response of non-equilibrium systems can be used for designing enhanced sensors.