Practical Implementations of Twirl Operations

Details Practical Implementations of Twirl Operations Practical Implementations of Twirl Operations

2004-09-21

arxiv.org/abs/quant-ph/0409142v1

Phys. Rev. A 71, 032327 (2005)

Physics

Quantum Physics

6 pages RevTex4 including 2 figures (fig 1 low quality to save space)

Scientific paper

10.1103/PhysRevA.71.032327

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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