Abstract
We show that controlled-controlled-NOT (CCN) operation-based entanglement
purification protocol can be further improved. CCN protocol requires Bell state
measurements after performing the CCN operations. In the original CCN protocol, the
measured states are assumed to be destroyed. However, if controlled-NOT gates are
used to perform such Bell state measurements, in some unsuccessful situations of the
CCN protocol, one can further purify the two mixed entangled states which are to be
measured. In this way, the total efficiency of the CCN protocol is further
increased.
© 2012 Chinese Optics Letters
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