Optimized Entanglement Purification

Stefan Krastanov; Victor V. Albert; Liang Jiang

doi:10.22331/q-2019-02-18-123

Optimized Entanglement Purification

Stefan Krastanov^1,2, Victor V. Albert^1,2,3, and Liang Jiang^1,2

¹Departments of Applied Physics and Physics, Yale University, New Haven, CT 06511, USA
²Yale Quantum Institute, Yale University, New Haven, CT 06520, USA
³Walter Burke Institute for Theoretical Physics and Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA

Published:	2019-02-18, volume 3, page 123
Eprint:	arXiv:1712.09762v3
Doi:	https://doi.org/10.22331/q-2019-02-18-123
Citation:	Quantum 3, 123 (2019).

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Abstract

We investigate novel protocols for entanglement purification of qubit Bell pairs. Employing genetic algorithms for the design of the purification circuit, we obtain shorter circuits achieving higher success rates and better final fidelities than what is currently available in the literature. We provide a software tool for analytical and numerical study of the generated purification circuits, under customizable error models. These new purification protocols pave the way to practical implementations of modular quantum computers and quantum repeaters. Our approach is particularly attentive to the effects of finite resources and imperfect local operations - phenomena neglected in the usual asymptotic approach to the problem. The choice of the building blocks permitted in the construction of the circuits is based on a thorough enumeration of the local Clifford operations that act as permutations on the basis of Bell states.

Featured image: A short optimized entanglement purification circuit for a 4-qubit register designed by a genetic algorithm.

► BibTeX data

@article{Krastanov2019optimized,
  doi = {10.22331/q-2019-02-18-123},
  url = {https://doi.org/10.22331/q-2019-02-18-123},
  title = {Optimized {E}ntanglement {P}urification},
  author = {Krastanov, Stefan and Albert, Victor V. and Jiang, Liang},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {3},
  pages = {123},
  month = feb,
  year = {2019}
}

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