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QI: Fachverband Quanteninformation
QI 6: Quantum Metrology and Sensing (joint session QI/Q)
QI 6.5: Vortrag
Montag, 10. März 2025, 18:15–18:30, HS VIII
Activation of metrologically useful genuine multipartite entanglement — •Róbert Trényi1,2,3,4, Árpád Lukács1,4,5, Paweł Horodecki6,7, Ryszard Horodecki6, Vértesi Tamás8, and Géza Tóth1,2,3,4,9 — 1Dept. of Th. Phys., UPV/EHU, Bilbao, Spain — 2EHU Quantum Center, UPV/EHU, Bilbao, Spain — 3DIPC, San Sebastián, Spain — 4HUN-REN Wigner RCP, Budapest, Hungary — 5Dept. of Math. Sci., Durh. Univ., UK — 6Int. Cnt. for Theory of Quant. Tech., UG, Gdansk, Poland — 7Fac. of Appl. Phys. and Math., Nat. Quant. Inf. Cnt., GUT, Gdansk, Poland — 8HUN-REN Inst. for Nucl. Research, Debrecen, Hungary — 9IKERBASQUE, Bilbao, Spain
Quantum states with metrologically useful genuine multipartite entanglement (GME) outperform all states without GME in metrology. States reaching the maximal utility in metrology all belong to this convex set of quantum states. With our proposed scheme, we can identify a broad class of practically important states that possess metrologically useful GME in the case of several copies, even though in the single copy case these states can be non-useful, i.e., not more useful than separable states. Thus, we essentially activate quantum metrologically useful GME. We discuss how our findings are related to error correction. We also analyze the iterative method applied to maximize the metrological usefulness for a given quantum state. In particular, we carry out an optimization of the metrological performance over possible local Hamiltonians with a see-saw method.
Keywords: quantum metrology; activation; genuine multipartite entanglement; Fisher information