2014/03/19 by Fabian Ewert, Peter van Loock · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.140403
published as Phys. Rev. Lett. 113, 140403 (2014) · 5+3 pages, 2 figures. Comments are welcome!
arxiv created 2014/03/19 · arxiv updated 2014/10/08
It is well known that an unambiguous discrimination of the four optically encoded Bell states is possible with a probability of 50% at best, when using static, passive linear optics and arbitrarily many vacuum mode ancillae. By adding unentangled single-photon ancillae, we are able to surpass this limit and reach a success probability of at least 75%. We discuss the error robustness of the proposed scheme and a generalization to reach a success probability arbitrarily close to 100%.