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author:

Ding, Z.-X. (Ding, Z.-X..) [1] | Hu, C.-S. (Hu, C.-S..) [2] | Shen, L.-T. (Shen, L.-T..) [3] | Yang, Z.-B. (Yang, Z.-B..) [4] | Wu, H. (Wu, H..) [5] | Zheng, S.-B. (Zheng, S.-B..) [6]

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Abstract:

Preparation of entangled steady states via dissipation and pumping in Rydberg atoms has been recently found to be useful for quantum information processing. The driven-dissipative dynamics is closely related to the natural linewidth of the Rydberg states and can be usually modulated by engineering the thermal reservior. Instead of modifying the effectively radiative decay, we propose an alternatively optimized scheme, which combines the resonant Rydberg antiblockade excitation and the Lyapunov control of the ground states to speed up the prepration of the singlet state for two interacting Rydberg atoms. The acceleration process strongly depends on the initial state of the system with respect to the initial coherence between the singlet state and decoherence-sensitive bright state. We study the optimal parameter regime for fast entanglement preparation and the robustness of the fidelity against random noises. The numerical results show that a fidelity above 0.99 can be achieved around 0.4 ms with the current experimental parameters. The scheme may be generalized for preparation of more complicate multi-atom entangled states. © 2019 Astro Ltd.

Keyword:

antiblockade; Lyapunov control; Rydberg atoms; singlet state

Community:

  • [ 1 ] [Ding, Z.-X.]Fujian Key Laboratory of Quantum Information and Quantum Optics, Department of Physics, Fuzhou University, Fuzhou, Fujian, 350116, China
  • [ 2 ] [Hu, C.-S.]Fujian Key Laboratory of Quantum Information and Quantum Optics, Department of Physics, Fuzhou University, Fuzhou, Fujian, 350116, China
  • [ 3 ] [Shen, L.-T.]Fujian Key Laboratory of Quantum Information and Quantum Optics, Department of Physics, Fuzhou University, Fuzhou, Fujian, 350116, China
  • [ 4 ] [Yang, Z.-B.]Fujian Key Laboratory of Quantum Information and Quantum Optics, Department of Physics, Fuzhou University, Fuzhou, Fujian, 350116, China
  • [ 5 ] [Wu, H.]Fujian Key Laboratory of Quantum Information and Quantum Optics, Department of Physics, Fuzhou University, Fuzhou, Fujian, 350116, China
  • [ 6 ] [Wu, H.]School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
  • [ 7 ] [Wu, H.]Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
  • [ 8 ] [Zheng, S.-B.]Fujian Key Laboratory of Quantum Information and Quantum Optics, Department of Physics, Fuzhou University, Fuzhou, Fujian, 350116, China

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Source :

Laser Physics Letters

ISSN: 1612-2011

Year: 2019

Issue: 4

Volume: 16

1 . 8 8 4

JCR@2019

1 . 4 0 0

JCR@2023

ESI HC Threshold:138

JCR Journal Grade:3

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 9

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 6

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