摘要
The schematic optical realization of deterministic multicopy(three-copy)entanglement concentration under local operations and classical communication(LOCC)is presented,which can resort to the linear optical elements,controlled-NOT gate that uses weak cross-Kerr nonlinearity effect and entangled qudits with different degrees of freedom.This concentration is based on Nielsen's theorem,which in principle quantifies the unit success probability.In addition,the required positive operator-valued measurement(POVM)is implemented through direct sum extension,because the least number of ancillary dimensions is demanded.The construction of POVM is systematically formulated,which results in the feasibility to generate the protocol to n-copy(n>3)cases.
基金
Supported by the National Natural Science Foundation of China under Grant No 60677044 and 11005099
the Fundamental Research Funds for the Central University under Grant No 201313012.
