中国物理B ›› 2020, Vol. 29 ›› Issue (12): 124203-.doi: 10.1088/1674-1056/abab75

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

  

  • 收稿日期:2020-04-22 修回日期:2020-06-28 接受日期:2020-08-01 出版日期:2020-12-01 发布日期:2020-11-13

Quantum speed limit time and entanglement in a non-Markovian evolution of spin qubits of coupled quantum dots

M. Bagheri Harouni1,2,†   

  1. 1 Department of Physics, University of Isfahan, Hezar Jerib St., Isfahan 81764-73441, Iran; 2 Department of Physics, Quantum Optics Group, University of Isfahan, Hezar Jerib St., Isfahan 81764-73441, Iran
  • Received:2020-04-22 Revised:2020-06-28 Accepted:2020-08-01 Online:2020-12-01 Published:2020-11-13
  • Contact: Corresponding author. E-mail: m-bagheri@phys.ui.ac.ir

Abstract: Quantum speed limit time and entanglement in a system composed of coupled quantum dots are investigated. The excess electron spin in each quantum dot constitutes the physical system (qubit). Also the spin interaction is modeled through the Heisenberg model and the spins are imposed by an external magnetic field. Taking into account the spin relaxation as a non-Markovian process, the quantum speed limit and entanglement evolution are discussed. Our findings reveal that increasing the magnetic field leads to the faster quantum evolution. In addition, the temperature increment causes the longer quantum speed limit time as well as the entanglement degradation.

Key words: quantum speed limit time, quantum entanglement, open quantum systems, quantum dots

中图分类号:  (Quantum state engineering and measurements)

  • 42.50.Dv
11.10.Nx (Noncommutative field theory) 42.50.Pq (Cavity quantum electrodynamics; micromasers)