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oai:docta.ucm.es:20.500.14352/72512023-08-25T10:42:04Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Corrêa, William H. G. author Lami, Ludovico author Palazuelos Cabezón, Carlos author 2021 We prove a tight and close-to-optimal lower bound on the effectiveness of local quantum measurements (without classical communication) at discriminating any two bipartite quantum states. Our result implies, for example, that any two orthogonal quantum states of a nA×nB bipartite quantum system can be discriminated via local measurements with an error probability no larger than 1/2 (1 − 1/ cmin{nA,nB}, where 1 ≤ c ≤ 2√2 is a universal constant, and our bound scales provably optimally with the local dimensions nA, nB. Mathematically, this is achieved by showing that the distinguishability norm ||·||LO associated with local measurements satisfies that ||·||≤ 2√2min{nA, nB} ||·|LO, where ||·||1 is the trace norm. https://hdl.handle.net/20.500.14352/7251 Maximal gap between local and global distinguishability of bipartite quantum states