title: Magnetic reversal dynamics of a quantum system on a picosecond timescale.
abstract: We present our approach for a consistent, fully quantum mechanical description of the magnetization reversal process in natural and artificial atomic systems by means of short magnetic pulses. In terms of the simplest model of a two-level system with a magnetic moment, we analyze the possibility of a fast magnetization reversal on the picosecond timescale induced by oscillating or short unipolar magnetic pulses. We demonstrate the possibility of selective magnetization reversal of a superconducting flux qubit using a single flux quantum-based pulse and suggest a promising, rapid Λ-scheme for resonant implementation of this process. In addition, the magnetization reversal treatment is fulfilled within the framework of the macroscopic theory of the magnetic moment, which allows for the comparison and explanation of the quantum and classical behavior.
authors.affiliation: Lomonosov Moscow State University Physics Department, Moscow 119991, Russia ; Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia ; Lukin Scientific Research Institute of Physical Problems, Zelenograd, Moscow 124460, Russia ; Moscow Institute of Physics and Technology, State University, Dolgoprudniy, Moscow Region, Russia.
authors.forename: Nikolay V
authors.initials: NV
authors.lastname: Klenov
authors.affiliation: Lomonosov Moscow State University Physics Department, Moscow 119991, Russia.
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Kuznetsov
authors.affiliation: Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia ; Lukin Scientific Research Institute of Physical Problems, Zelenograd, Moscow 124460, Russia ; Moscow Institute of Physics and Technology, State University, Dolgoprudniy, Moscow Region, Russia.
authors.forename: Igor I
authors.initials: II
authors.lastname: Soloviev
authors.affiliation: Lomonosov Moscow State University Physics Department, Moscow 119991, Russia ; Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Bakurskiy
authors.affiliation: Lomonosov Moscow State University Physics Department, Moscow 119991, Russia ; Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia.
authors.forename: Olga V
authors.initials: OV
authors.lastname: Tikhonova
keywords: RSFQ; atomic-based qubits; magnetization reversal; quantum state control; superconducting qubits