Quantum Leap to Calm express

Original: "A Description of the Quantum Mpemba Effect using the Steepest-Entropy-Ascent Quantum Thermodynamics Framework"
arXiv:2603.24522 · 2026-03-25 · CC BY 4.0 · 1 min
A quantum system reaches calm faster if you give it a good shake beforehand.

In the quantum world, the path to calm sometimes resembles a paradoxical race: starting further from the finish, the system reaches equilibrium faster. This effect, a quantum analog of the Mpemba phenomenon, is due to the rapid growth of entropy — a measure of disorder. A strong push at the start seems to trigger an avalanche of changes that accelerates settling.

Classic case: hot water sometimes freezes faster than cold. In the quantum world, particles similarly 'freeze' into the ground state faster after strong excitation.

Scientists built a model based on the principle of maximum entropy growth, tracing back to Ludwig Boltzmann. By compressing the description from four to three dimensions, they achieved agreement with a laboratory three-level system. Machine learning revealed the key parameter governing the decay rate. Thus, a precise formula for the quantum 'shake' emerged.

Ironically, the principle of fastest entropy growth initially described the universe's march toward heat death, and today it helps accelerate quantum computing.

This is not just theory: qubits will be able to reach the desired state faster after a short excitation. This engineering trick will shorten waiting times in future devices.

Aristotle described the rapid freezing of heated water, but the effect was named after Tanzanian schoolboy Erasto Mpemba: in 1963, he noticed that hot ice cream freezes faster.

Scientists
Alan GuthAlexander FriedmannAndrei LindeGeorges LemaîtreJames PeeblesLudwig Boltzmann
Concepts
quantum mpemba effect quantum freezing phenomena thermal equilibrium Unruh effect relaxation thermal state nonadiabatic transition superposition principle enthalpy exponential decay damping rate koopman operator thermalization heat dissipation two level system exponential growth time evolution principle of maximum entropy ground state thermoelectric device