High-efficiency multipartite entanglement purification of electron-spin states with charge detection

  • Authors:

  • Tao Li;Bao-Cang Ren;Hai-Rui Wei;Ming Hua;Fu-Guo Deng

  • Affiliations:

  • Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing, China 100875;Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing, China 100875;Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing, China 100875;Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing, China 100875;Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing, China 100875

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2013

Quantified Score

Hi-index 0.00

Visualization

Abstract

We present a high-efficiency multipartite entanglement purification protocol (MEPP) for electron-spin systems in a Greenberger---Horne---Zeilinger state based on their spins and their charges. Our MEPP contains two parts. The first part is our normal MEPP with which the parties can obtain a high-fidelity N-electron ensemble directly, similar to the MEPP with controlled-not gates. The second one is our recycling MEPP with entanglement link from N驴-electron subsystems (2 N驴 N). It is interesting to show that the N驴-electron subsystems can be obtained efficiently by measuring the electrons with potential bit-flip errors from the instances which are useless and are just discarded in all existing conventional MEPPs. Combining these two parts, our MEPP has the advantage of the efficiency higher than other MEPPs largely for electron-spin systems.