ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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Probabilistic Erasing of Quantum Information

ZHANG Hongtao, ZENG Jinyan   

  1. Department of Physics, Peking University, Beijing, 100871
  • Received:2002-04-09 Online:2003-01-20 Published:2003-01-20

Abstract: According to the superposition principle of quantum states, an arbitrary quantum states can not be deterministically erased(Pati & Braunstein), but may be probabilistically erased. Similar to the probabilistic cloning of quantum states by Duan & Guo, in this paper a probabilistic erasing scheme is developed, i.e., two non-orthogonal states secretly chosen from a certain set {|ψ1〉, ψ2〉} can be probabilistically erased through a unitary transformation U in combination with a subsequent measurement M. The differences in characters and efficiencies between probabilistic cloning and erasing are discussed.