Practical implementations of twirl operations

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.032327· OSTI ID:20650365

Anwar, M S; Xiao, L; Short, A J; Jones, J A; Blazina, D; Duckett, S B; Carteret, H A ^[1]

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1. Centre for Quantum Computation, Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU (United Kingdom)

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.

• OSTI ID: 20650365
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CORRELATIONS
ENERGY LEVELS
IMPLEMENTATION
INFORMATION THEORY
LIQUIDS
MIXED STATE
NUCLEAR MAGNETIC RESONANCE
QUANTUM MECHANICS
QUANTUM NUMBERS
SPIN