, Results Ancilla: a single photon Simplest type of ancilla, no known scheme ? Polarization-preserving bound predicts P succ ? 1
, ? Numerical search confirms the result Do entangled ancillae help? ? 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
, Explored several ancillae?? 3 4 stays the best (for small networks)
, We have automated second quantization simulator, up to 10 modes and 8 photons
But how to generalize "unambiguous"? ? Adapt for state generation problem ,