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Paper   IPM / Physic / 17856
School of Physics
  Title:   Position dependence of Nielsen complexity for the Thermofield double state
  Author(s): 
1.  F. Khorasania
2.  R. Pirmoradian
3.  M.R. Tanhayi
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  851
  Year:  2024
  Pages:   138585
  Supported by:  IPM
  Abstract:
In this paper, the Nielsen geometric method is used to study the position dependence of the Nielsen complexity for the thermofield double state of a harmonic oscillator. We present the state shift under the influence of an external electric field and demonstrate its importance for the construction of the corresponding circuit. By numerical analysis, we investigate the effect of the frequency and the external field on the dynamics of complexity. Our observation reveals that the system’s complexity diminishes considerably with the rise of the frequency. Furthermore, our findings indicate that the complexity exhibits a distinct behavior under a feeble external electric field, as it grows more intricate with the escalation of the frequency. However, with higher magnitudes of the electric field, the system reverts to its prior behavior. We also remark on the influence of the reference state’s frequency on the complexity.

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