Activating Hidden Metrological Usefulness

Toth, G; Vertesi, T; Horodecki, P; Horodecki, R

Toth, G (corresponding author), Univ Basque Country, UPV EHU, Dept Theoret Phys, POB 644, E-48080 Bilbao, Spain.; Toth, G (corresponding author), Donostia Int Phys Ctr DIPC, POB 1072, E-20080 San Sebastian, Spain.; Toth, G (corresponding author), Basque Fdn Sci, Ikerbasque, E-48013 Bilbao, Spain.; Toth, G (corresponding author), Hungarian Acad Sci, Wigner Res Ctr Phys, POB 49, H-525 Budapest, Hungary.; Vertesi, T (corresponding author), Hungarian Acad Sci, Inst Nucl Res, MTA Atomki Lendulet Quantum Correlat Res Grp, POB 51, H-4001 Debrecen, Hungary.

PHYSICAL REVIEW LETTERS, 2020; 125 (2):

Abstract

We consider bipartite entangled states that cannot outperform separable states in any linear interferometer. Then, we show that these states can still......

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