The Mpemba Paradox: Hot Quantum Sensors Measure Temperature More Accurately ⚡ экспресс
In quantum thermometry, probes are typically brought to thermal equilibrium, but this takes time and limits sensitivity. It turns out that the famous Mpemba paradox—where a hotter body cools faster than a colder one—can be turned into a measurement resource. The authors rigorously proved that non-equilibrium initial states, similar to the 'Mpemba effect', temporarily enhance the precision of temperature estimation (quantum Fisher information). This approach bypasses classical limits and enables ultrafast nanosensors that exploit fleeting dynamic processes.
A cook sprays water onto a hot skillet: droplets sizzle and vanish, instantly signaling the temperature—faster than waiting for a thermometer. A similar principle now works in quantum thermometry. A tiny sensor (say, an atom) is deliberately heated, and as it rushes back toward rest—the growth of entropy (disorder) as per Boltzmann’s legacy—it briefly becomes hypersensitive to the ambient temperature. The paradox: starting from a hot state accelerates cooling—exactly like the Mpemba effect, where hot water freezes faster than cold.
This is critical for quantum computers and microchips, where conventional thermal control is impossible. And the Mpemba effect itself still lacks a single explanation—scientists still debate the causes, yet it already serves as a practical tool.
🎯 The Mpemba effect remains a mystery: scientists cannot unequivocally explain it. Hypotheses include evaporation, convection, and supercooling.