Practical implementations of twirl operations

M S Anwar, L Xiao, A J Short, J A Jones, D Blazina, S B Duckett, H A Carteret

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)


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.

Original languageEnglish
Article number032327
Pages (from-to)-
Number of pages7
JournalPhysical Review A: Atomic, Molecular and Optical Physics
Issue number3
Publication statusPublished - Mar 2005


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