Physics – Quantum Physics
Scientific paper
2007-06-07
Physical Review A, 2008, 77(3): 032337 (7 pages).
Physics
Quantum Physics
6 pages, 2 figures, we have added Lemma 5 and its proof, and some sentences have been modified and supplemented, as well
Scientific paper
Recently, the problem of discriminating multipartite unitary operations by local operations and classical communication (LOCC) has attracted significant attention. The latest work in the literature on this problem showed that two multipartite unitary operations can always be perfectly distinguished by LOCC when a finite number of runs are allowable. However, in these schemes, local entanglement (an entangled state holden by one party) was required, which seems to imply that local entanglement is necessary for perfect discrimination between unitary operations by LOCC. In this article, we show that a perfect discrimination between two unitary operations acting on a two-qudits can always be achieved without exploiting any entanglement. As a result, we conclude that local entanglement is not necessary for perfect discrimination between unitary operations acting on two-qudits by LOCC.
Li Lvzhou
Qiu Daowen
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