中国物理B ›› 2020, Vol. 29 ›› Issue (8): 83203-083203.doi: 10.1088/1674-1056/ab99b1

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇    下一篇

Transparently manipulating spin-orbit qubit via exact degenerate ground states

Kuo Hai(海阔), Wenhua Zhu(朱文华), Qiong Chen(陈琼), Wenhua Hai(海文华)   

  1. Department of Physics and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2020-03-30 修回日期:2020-05-14 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Kuo Hai, Kuo Hai E-mail:ron.khai@gmail.com;whhai2005@aliyun.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11204077 and 11475060), the Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ10002), the Hunan Provincial Hundred People Plan, China (2019), and the Science and Technology Plan Project of Hunan Province, China.

Transparently manipulating spin-orbit qubit via exact degenerate ground states

Kuo Hai(海阔), Wenhua Zhu(朱文华), Qiong Chen(陈琼), Wenhua Hai(海文华)   

  1. Department of Physics and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
  • Received:2020-03-30 Revised:2020-05-14 Online:2020-08-05 Published:2020-08-05
  • Contact: Kuo Hai, Kuo Hai E-mail:ron.khai@gmail.com;whhai2005@aliyun.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11204077 and 11475060), the Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ10002), the Hunan Provincial Hundred People Plan, China (2019), and the Science and Technology Plan Project of Hunan Province, China.

摘要:

By investigating a harmonically confined and periodically driven particle system with spin-orbit coupling (SOC) and a specific controlled parameter, we demonstrate an exactly solvable two-level model with a complete set of spin-motion entangled Schrödinger kitten (or cat) states. In the undriven case, application of a modulation resonance results in the exact stationary states. We show a decoherence-averse effect of SOC and implement a transparent coherent control by exchanging positions of the probability-density wavepackets to create transitions between the different degenerate ground states. The expected energy consisting of quantum and continuous parts is derived, and the energy deviations caused by the exchange operations are much less than the quantum gap. The results could be directly extended to a weakly coupled single-particle chain for transparently encoding spin-orbit qubits via the robust spin-motion entangled degenerate ground states.

关键词: transparent coherent control, spin-orbit qubit, exact degenerate ground state, spin-orbit coupling, spin-motion entanglement

Abstract:

By investigating a harmonically confined and periodically driven particle system with spin-orbit coupling (SOC) and a specific controlled parameter, we demonstrate an exactly solvable two-level model with a complete set of spin-motion entangled Schrödinger kitten (or cat) states. In the undriven case, application of a modulation resonance results in the exact stationary states. We show a decoherence-averse effect of SOC and implement a transparent coherent control by exchanging positions of the probability-density wavepackets to create transitions between the different degenerate ground states. The expected energy consisting of quantum and continuous parts is derived, and the energy deviations caused by the exchange operations are much less than the quantum gap. The results could be directly extended to a weakly coupled single-particle chain for transparently encoding spin-orbit qubits via the robust spin-motion entangled degenerate ground states.

Key words: transparent coherent control, spin-orbit qubit, exact degenerate ground state, spin-orbit coupling, spin-motion entanglement

中图分类号:  (Coherent control of atomic interactions with photons)

  • 32.80.Qk
71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 32.90.+a (Other topics in atomic properties and interactions of atoms with photons) 03.65.Ge (Solutions of wave equations: bound states)