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Phys. Rev. A 69, 062111 (2004) [8 pages]

Active and passive quantum erasers for neutral kaons

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A. Bramon1, G. Garbarino2, and B. C. Hiesmayr3
1Grup de Física Teòrica, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
2Dipartimento di Fisica Teorica, Università di Torino and INFN, Sezione di Torino, I-10125 Torino, Italy
3Institute for Experimental Physics, University of Vienna, A-1090 Vienna, Austria

Received 27 February 2004; published 23 June 2004

Quantum marking and quantum erasure are discussed for the neutral kaon system. Contrary to other two-level systems, the strangeness and lifetime of a neutral kaon state can be alternatively measured via an “active” or a “passive” procedure. This offers quantum erasure possibilities. In particular, the operation of a quantum eraser in the “delayed choice” mode is clearly illustrated.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.69.062111
DOI: 10.1103/PhysRevA.69.062111
PACS: 03.65.−w, 14.40.Aq

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