Observation of coherent oscillation in single-passage Landau-Zener transitions

Abstract

Landau-Zener transition (LZT) has been explored in a variety of physical systems for coherent population transfer between different quantum states. In recent years, there have been various proposals for applying LZT to quantum information processing because when compared to the methods using ac pulse for coherent population transfer, protocols based on LZT are less sensitive to timing errors. However, the effect of finite range of qubit energy available to LZT based state control operations has not been thoroughly examined. In this work, we show that using the well-known Landau-Zener formula in the vicinity of an avoided energy-level crossing will cause considerable errors due to coherent oscillation of the transition probability in a single-passage LZT experiment. The data agree well with the numerical simulations which take the transient dynamics of LZT into account. These results not only provide a closer view on the issue of finite-time LZT but also shed light on its effects on the quantum state manipulation.

arXiv comment10 pages,5 figures

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• Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
• Spin shuttling in a silicon double quantum dot
• Dynamics of dissipative Landau-Zener transitions
• Charge Qubit-Atom Hybrid
• Breaking the quantum adiabatic speed limit by jumping along geodesics
• Non-exponential tunneling due to mean-field induced swallowtails
• Detuning-induced robustness of a three-state Lanzau-Zener model against dissipation
• Pentagon chain in external fields
• High-fidelity quantum control via Autler-Townes splitting
• Electric circuit analog of Landau-Zener tunneling using time-varying elements
• Spin qubit shuttling between coupled quantum dots with inhomogeneous Landé g-tensors
• Hall Shift Current and Nonlinear Anomalous Hall Effect in Gapped Dirac Fermion Systems