Adiabatic quantum dynamics under decoherence in a controllable trapped-ion setup

Chang-Kang Hu, Alan C. Santos, Jin-Ming Cui, Yun-Feng Huang, Marcelo S. Sarandy, Chuan-Feng Li, and Guang-Can Guo
Phys. Rev. A 99, 062320 – Published 17 June 2019

Abstract

Suppressing undesired nonunitary effects is a major challenge in quantum computation and quantum control. In this paper, by considering the adiabatic dynamics in the presence of a surrounding environment, we theoretically and experimentally analyze the robustness of adiabaticity in open quantum systems. More specifically, by considering a decohering scenario, we exploit the validity conditions of the adiabatic approximation as well as its sensitiveness to the resonance situation, which typically harm adiabaticity in closed systems. As an illustration, we implement an oscillating Landau-Zener Hamiltonian, which shows that decoherence may drive the resonant system with high fidelities to the adiabatic behavior of open systems. Moreover we also implement the adiabatic quantum algorithm for the Deutsch problem, where a distinction is established between the open system adiabatic density operator and the target pure state expected in the computation process. Preferred time windows for obtaining the desired outcomes are then analyzed. We experimentally realize these systems through a single trapped ytterbium ion Yb+171, where the ion hyperfine energy levels are used as degrees of freedom of a two-level system, with both driven field and decohering strength efficiently controllable.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 14 March 2019

DOI:https://doi.org/10.1103/PhysRevA.99.062320

©2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Chang-Kang Hu1,2, Alan C. Santos3,*, Jin-Ming Cui1,2,†, Yun-Feng Huang1,2,‡, Marcelo S. Sarandy3,§, Chuan-Feng Li1,2,∥, and Guang-Can Guo1,2

  • 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, People's Republic of China
  • 2CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
  • 3Instituto de Física, Universidade Federal Fluminense, Avenida General Milton Tavares de Souza s/n, Gragoatá, 24210-346 Niterói, Rio de Janeiro, Brazil

  • *ac_santos@id.uff.br
  • jmcui@ustc.edu.cn
  • hyf@ustc.edu.cn
  • §msarandy@id.uff.br
  • cfli@ustc.edu.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 99, Iss. 6 — June 2019

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×