RQC Seminar

170th RQC Seminar

• Speaker

  Mr. Artem Ryzhov
  ( B. Verkin ILTPE of NASU, Kharkiv, Ukraine )

• Date

  16:00-17:00 (4:00 -5:00 p.m.), October 30, 2024 (Wednesday)

• Venue

  Hybrid(ZOOM・ Wako Main Research 3F 345-347 Seminar Room/ 研究本館3階 セミナー室(345-347) C01）

• Title

  Alternative fast quantum logic gates using nonadiabatic Landau-Zener-Stückelberg-Majorana transitions

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
A conventional realization of quantum logic gates and control is based on resonant Rabi oscillations of the occupation probability of the system. This approach has certain limitations and complications, like counter-rotating terms. We study an alternative paradigm for implementing quantum logic gates based on Landau-Zener-Stückelberg-Majorana (LZSM) interferometry with nonresonant driving and the alternation of adiabatic evolution and nonadiabatic transitions. Compared to Rabi oscillations, the main differences are a nonresonant driving frequency and a small number of periods in the external driving. We explore the dynamics of a multilevel quantum system under LZSM drives and optimize the parameters for increasing the gate speed. We define the parameters of the external driving required for implementing a specific quantum logic gate using the adiabatic-impulse model. In particular, we demonstrate the implementations of single-qubit X, Y, Hadamard gates, and two-qubit iswap and cnot gates using the LZSM transitions. The considered LZSM approach for implementing arbitrary quantum logic gates can be applied to a large variety of multilevel quantum systems and external driving.
[1] A. I. Ryzhov, O. V. Ivakhnenko, S. N. Shevchenko, M. F. Gonzalez-Zalba, and Franco Nori, "Alternative fast quantum logic gates using nonadiabatic Landau-Zener-Stückelberg-Majorana transitions", Phys. Rev. Research 6, 033340 (2024).
(URL: https://doi.org/10.1103/PhysRevResearch.6.033340)