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University of Illinois – Urbana-Champaign

1. Halataei, Seyyed Mohammad Hassan. Revisiting physics of quantum bits.

Degree: PhD, Physics, 2017, University of Illinois – Urbana-Champaign

Advancements in the technology of quantum bits invoke more precise calculations for decoherence and dissipative effects. In this thesis, the physics of truncated two level systems is revisited and it is shown that in some systems, such as in triple-junction superconducting flux qubit, environmental noises that are usually recognized to only have dissipative effects and the trivial resultant dephasing, can also cause pure dephasing. Furthermore, it is demonstrated that, in the current domain of interest for quantum computation purposes, the effective Hamiltonian of single molecule magnets in interaction with a spin bath differs from the commonly quoted result in the literature. It is also shown that the topological effects in such problems are as small as transitional effects to higher excited states beyond the two-level picture. Finally, a simulation of the quantum noise by the classical noise and a simulation of spin bath by oscillator bath for a quantum bit as the principal system are presented. Advisors/Committee Members: Leggett, Anthony J (advisor), Cooper, Lance (Committee Chair), Weissman, Michael B (committee member), Bezryadin, Alexey (committee member).

Subjects/Keywords: Qubit; Decoherence; Dissipation; Superconducting Qubit; Flux Qubit; Nano magnetic molecule; Molecular qubit; Quantum noise simulation; oscillator bath simulation; spin bath; mapping; Double well potential; Classical noise; Landau-Zener effect

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APA (6th Edition):

Halataei, S. M. H. (2017). Revisiting physics of quantum bits. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from

Chicago Manual of Style (16th Edition):

Halataei, Seyyed Mohammad Hassan. “Revisiting physics of quantum bits.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed October 20, 2019.

MLA Handbook (7th Edition):

Halataei, Seyyed Mohammad Hassan. “Revisiting physics of quantum bits.” 2017. Web. 20 Oct 2019.


Halataei SMH. Revisiting physics of quantum bits. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2019 Oct 20]. Available from:

Council of Science Editors:

Halataei SMH. Revisiting physics of quantum bits. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: