RT Journal Article
T1 Maximal gap between local and global distinguishability of bipartite quantum states
A1 Corrêa, William H. G.
A1 Lami, Ludovico
A1 Palazuelos Cabezón, Carlos
AB 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.
YR 2021
FD 2021
LK https://hdl.handle.net/20.500.14352/7251
UL https://hdl.handle.net/20.500.14352/7251
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
NO Ministerio de Ciencia e Innovación (MICINN)
NO Comunidad de Madrid
DS Docta Complutense
RD 8 abr 2025