The quantum-classical correspondence principle for work distributions

TL;DR

This paper investigates the relationship between quantum and classical work distributions in driven systems, showing that semiclassical methods can accurately approximate quantum results and elucidate the quantum-classical correspondence.

Contribution

The study employs semiclassical techniques and numerical simulations to connect quantum and classical work distributions, clarifying the quantum-classical correspondence principle for work in driven systems.

Findings

Semiclassical work distribution closely matches quantum distribution with interference effects.

Neglecting interference reduces quantum distribution to classical distribution.

Quantum distribution exhibits tunneling behavior at classically forbidden regions.

Abstract

For closed quantum systems driven away from equilibrium, work is often defined in terms of projective measurements of initial and final energies. This definition leads to statistical distributions of work that satisfy nonequilibrium work and fluctuation relations. While this two-point measurement definition of quantum work can be justified heuristically by appeal to the first law of thermodynamics, its relationship to the classical definition of work has not been carefully examined. In this paper we employ semiclassical methods, combined with numerical simulations of a driven quartic oscillator, to study the correspondence between classical and quantal definitions of work in systems with one degree of freedom. We find that a semiclassical work distribution, built from classical trajectories that connect the initial and final energies, provides an excellent approximation to the quantum work distribution when the trajectories are assigned suitable phases and are allowed to interfere. Neglecting the interferences between trajectories reduces the distribution to that of the corresponding classical process. Hence, in the semiclassical limit, the quantum work distribution converges to the classical distribution, decorated by a quantum interference pattern. We also derive the form of the quantum work distribution at the boundary between classically allowed and forbidden regions, where this distribution tunnels into the forbidden region. Our results clarify how the correspondence principle applies in the context of quantum and classical work distributions, and contribute to the understanding of work and nonequilibrium work relations in the quantum regime.