Functional field integral approach to quantum work

Abstract

We introduce the functional field integral approach to study the statistics of quantum work under nonequilibrium conditions and derive the general formalism for a bilinear Hamiltonian with arbitrary time dependence. The method is then examined in three models. For the transverse Ising chain, it yields the correct quantum critical scaling and dynamical quantum phase transitions for single and double quench protocols, respectively. For the Su-Schrieffer-Heeger (SSH) model, we observe nonuniversal quantum critical scaling with anomalous $1/N$-correction due to its topological nature. Dynamical quantum phase transitions are observed for three different time evolution protocols but their time periodicity only appears in the double quench case. We then extend our method to the Bardeen-Cooper-Schrieffer (BCS) model for superconductivity and discuss the possibility of its application for general correlated models in combination with either the mean-field approximation or exact Monte Carlo simulations on classical (auxiliary) fields or disorders. Our method has the advantage of numerical simplicity, in the cost of explicit state evolution, and provides a promising way for exploring the physics of quantum work under general conditions.

13 pages, 9 figures

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Cited by in corpus (8)

• Work as an external quantum observable and an operational quantum work fluctuation theorem
• Biorthogonal Dynamical Quantum Phase Transitions in Non-Hermitian Systems
• Group-theoretical approach to the calculation of quantum work distribution
• Joint measurability in nonequilibrium quantum thermodynamics
• Non-Gaussian work statistics at finite-time driving
• Nonequilibrium Green's function's approach to the calculation of work statistics
• Path integral approach to the calculation of the characteristic function of work
• Phase transitions in quantum tunneling and quasi-exact solvability for a family of parametric double-well potentials