Work

Thermal quantum harmonic oscillator under magnetic field: A complexity approach

Year: 2025

Type: article

Abstract: In this paper, we investigate the circuit complexity of a quantum harmonic oscillator subjected to an external magnetic field. Utilizing the Nielsen approach within the thermofield dynamics (TFD) framework, we determine the complexity of thermofield double states as functions of time, temperature, and the external magnetic field. Our subsequent analysis reveals various features of this complexity. For instance, as temperature increases, the amplitude of complexity oscillations also rises, while at low temperatures, complexity stabilizes at a constant positive value. Furthermore, the magnetic field creates two distinct sectors: strong magnetic fields exhibit periodic complexity oscillations, whereas weak magnetic fields induce a beating effect. Finally, we confirm that the rate of complexity obeys the Lloyd bound.

Source: Nuclear Physics B

DOI: 10.1016/j.nuclphysb.2025.117189

Authors: V. Avramov, M. Radomirov, R.C. Rashkov, T. Vetsov

Institutions: Sofia University "St. Kliment Ohridski", TU Wien

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond