title: 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.
authors: 1] National Laboratory of Solid State Microstructures and Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [3] Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
authors: Guozhu
authors: G
authors: Sun
authors: Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
authors: Xueda
authors: X
authors: Wen
authors: 1] Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA [2] National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
authors: Ming
authors: M
authors: Gong
authors: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
authors: Dan-Wei
authors: DW
authors: Zhang
authors: 1] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [2] National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
authors: Yang
authors: Y
authors: Yu
authors: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
authors: Shi-Liang
authors: SL
authors: Zhu
authors: National Laboratory of Solid State Microstructures and Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
authors: Jian
authors: J
authors: Chen
authors: 1] National Laboratory of Solid State Microstructures and Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors: Peiheng
authors: P
authors: Wu
authors: Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
authors: Siyuan
authors: S
authors: Han