Fig. 2: Experimentally feasible regime for demonstrating state discrimination enhanced by collective measurements.
From: Discriminating mixed qubit states with collective measurements
a The expected error probabilities attainable for distinguishing between two and three copies of the quantum state, \({\rho }_{\pm }^{\otimes 2}\) and \({\rho }_{\pm }^{\otimes 3}\), when allowing only local operations and classical communication (LOCC) measurements (Pe,LOCC) and when allowing collective measurements (Pe,Col). b We plot the gap between the optimal LOCC measurement and the optimal collective measurement for two and three copies of the probe state. These plots correspond to α = π/4 and v = 0.1. In both figures the solid and dashed lines correspond to two- and three-copy results respectively.
