Practical implementations of twirl operations

2004/09/21 by M. S. Anwar, Muhammad Sabieh Anwar, Xiao Li +11 · 2 citations
Chemistry · Computer Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #quant-ph

paper · pdf · doi:10.1103/physreva.71.032327

published as Phys. Rev. A 71, 032327 (2005) · 6 pages RevTex4 including 2 figures (fig 1 low quality to save space)

arxiv created 2004/09/21 · openalex publication_date 2005/03/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Twirl operations, which convert impure singlet states into Werner states, play an important role in many schemes for entanglement purification. In this paper we describe strategies for implementing twirl operations, with an emphasis on methods suitable for ensemble quantum information processors such as nuclear magnetic resonance (NMR) quantum computers. We implement our twirl operation on a general two-spin mixed state using liquid-state NMR techniques, demonstrating that we can obtain the singlet Werner state with high fidelity.

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• Efficient formulation of quantum network under amplitude damping noise: Highlighting benefits over its Pauli-twirled counterpart
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