Universal scaling of work statistics for quantum quenches

TL;DR

This paper uncovers universal scaling laws in the work statistics of quantum phase transitions near critical points, revealing how different quench regimes depend on critical exponents and can be observed via Loschmidt echo or Ramsey interferometry.

Contribution

It introduces a systematic analysis of universal scaling behaviors in work statistics for quantum quenches near criticality, linking them to critical exponents and quench regimes.

Findings

Universal scaling behaviors in work statistics across different quench regimes

Critical exponents determine the scaling laws in quantum quenches

Potential experimental observation via Loschmidt echo or Ramsey interferometry

Abstract

In this paper, we systematically study the work statistics for quantum phase transition. For a quantum system approached by an anisotropic conformal field theory near the critical point, the driving protocols is divided into three different regimes for different quench rates, which reflects the competition between the frozen time and the quench time scale. In each regime, we find universal scaling behaviors in work statistics (after renormalization). It is shown that the critical exponents are determined by the space-time dimension $d$, the dynamical critical exponent $z$, the correlation-length exponent $\nu$, and the power-law protocols. These universal scalings in nonequilibrium process may be found in quantum phase transition by measuring the Loschmidt echo or the Ramsey interferometry.