Active and passive quantum erasers for neutral kaons
A. Bramòn, Gianni Garbarino, Beatrix C. Hiesmayr · Physical Review A · 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.