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quant-ph2000
Duality and Decoherence Free Subspaces
David D. Song, Richard J. Szabo
Quantum error avoiding codes are constructed by exploiting a geometric interpretation of the algebra of measurements of an open quantum system. The notion of a generalized Dirac op…
quant-ph2000
Quantum Anti-Cloning
David D. Song, Lucien Hardy
We derive the transformation for the optimal universal quantum anti-cloner which produces two anti-parallel outputs for a single input state. The fidelity is shown to be 2/3 which…