Disorder as an Ally: Quantum Memory express

Original: "Emergent Decoherence Dynamics in Doubly Disordered Spin Networks"
arXiv:2511.07785 · 2025-11-11 · CC BY 4.0 · 1 min
Physicists have discovered that disorder can protect quantum information, not destroy it.

In everyday life, order saves, disorder destroys. With quantum information, it's the opposite. In diamond, electrons and carbon nuclei act like tiny magnets storing a whisper. Gossipy electrons spread it instantly; nuclei pass it along the chain slowly. But crystal imperfections create quiet dead ends where leakage can't enter: there the whisper lives hundreds of times longer.

Decay law: $e^{-√(R_p t)}$ $e^{-R_d t}$. $R_p$ is the strength of long-range magnetic couplings, $R_d$ is the nuclear mixing rate.

With light pulses (optical spectroscopy), we can hush the gossip or slow the chain. The growth of entropy, the measure of chaos, usually destroys order. Yet local disorder blocks global decay. This was already pondered by Schrödinger and von Neumann. Conclusion: long-lived quantum memory requires not sterile purity but a dose of chaos.

At room temperature, such quantum states decay in milliseconds, but in the described experiment, the lifetime grew hundreds of times longer thanks to isolated 'pockets' in the crystal.

e^{-\sqrt{R_p t}} e^{-R_d t}
The probability that the quantum state does not decay after time t. R_p accounts for long-range magnetic couplings, R_d for slow mixing of nuclear states.
Scientists
Ludwig BoltzmannRudolf ClausiusErwin SchrödingerHugh Everett IIINiels BohrPascual Jordan
Concepts
quantum collective phenomena quantum decoherence disorder qubit decoherence entanglement protection emergent synchronization electronic structure emergent complexity modeling disorder induced phenomena complex system dynamics parkinsons disease spin polarization electromagnetism decay channel nonlinear dynamics entanglement generation complex systems bottleneck nonlinear interaction epilepsy