DECOHERENCE IN A PT-SYMMETRIC QUBIT

J. M. Bhat, M. Q. Lone*, S. Datta, G. N. Dar, A. Farouk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We investigate the decoherence in a PT-symmetric qubit coupled with a bosonic bath. Using canonical transformations, we map the non-Hermitian Hamiltonian representing the PT-sym-metric qubit to a spin boson model. Identifying the parameter α that demarcates the hermiticity and non-hermiticity in the model, we show that the qubit does not decohere at the transition from the real eigen spectrum to a complex eigen spectrum. Using a general class of spectral densities, the strong suppression of the decoherence is observed due to both vacuum and thermal fluctuations of the bath, and the initial correlations hold, as we approach the transition point.

Original languageEnglish
Pages (from-to)101-107
Number of pages7
JournalUkrainian Journal of Physics
Volume68
Issue number2
DOIs
Publication statusPublished - 20 Apr 2023
Externally publishedYes

Keywords

  • decoherence
  • PT-symmetry
  • system-bath correlations

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