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Virtual Qubit Reduces Thermodynamic Uncertainty, Enabling Enhanced Nanoscale System Performance

Researchers at Tianjin University introduced a virtual qubit formed by coherent coupling of two energy levels, showing it can suppress thermodynamic uncertainty in nanoscale engines. By separating uncertainty into classical and coherent parts, they found the coherent component becomes negative under resonant conditions, minimizing overall fluctuations. The study demonstrates that steady‑state currents and entropy production match a classical Markov description, while quantum coherence adds a distinct variance term. These insights outline criteria for surpassing traditional thermodynamic bounds, promising more efficient micro‑ and nanoscale thermal machines.