Quantum thermodynamics breakthrough unifies space and time in high-speed systems

Researchers from Peking University and the Collaborative Innovation Centre of Quantum Matter have made a breakthrough in quantum thermodynamics. They developed a new quasiprobability distribution that extends stochastic thermodynamics into the quantum realm. This advancement addresses long-standing challenges in modelling high-velocity quantum systems. Previously, extending fluctuation theorems to quantum systems was difficult due to uncertainties in defining energy and momentum simultaneously. The standard Wigner quasiprobability worked well in classical quantum mechanics, but the Margenau-Hill distribution was needed for relativistic contexts. The new approach combines both into a single framework.

The combined quasiprobability distribution allows stochastic work to be treated as a four-vector, unifying space and time. This ensures consistency across different frames of reference, a key requirement in relativistic physics. It also improves precision in energy fluctuation calculations by a factor of ten.

The current method relied on treating driving forces as classical particles, which limited accuracy. The new framework overcomes this by handling quantum uncertainties directly. Future work will explore fully quantum driving forces and their implications for other physical systems. The new quasiprobability distribution enables more accurate modelling of relativistic quantum systems. It provides a tenfold increase in precision for energy calculations and unifies the treatment of work across frames of reference. This development opens the door to further advancements in quantum thermodynamics.