?. Ancillae-help and . Grice, s one-Bell-pair: optimal 3 4 , by numerical search Conclusion Achievements What can we say on the optimal P succ of unambiguous Bell measurement? ? Upper bound for polarization-preserving interferometers, saturated by known schemes ? Hybrid numerical/symbolical search ? Confirms optimality of (some) known schemes ? New 2-photon scheme with Psucc = 5

?. Include, But how to generalize "unambiguous"? ? Adapt for state generation ? Relax PNRD assumption?