Wojciech Górecki (FUW): Multiple-phase quantum interferometry: real and apparent gains of measuring all the phases simultaneously
Quantum Information and Quantum Computing Seminars CTP PAS
We characterize operationally meaningful quantum gains in a paradigmatic model of lossless multiple-phase interferometry and stress insufficiency of the analysis based solely on the concept of quantum Fisher information (QFI). We show that the advantage of the optimal simultaneous estimation scheme amounts to a constant factor improvement when compared with schemes where each phase is estimated separately -- contrary to the results obtained by a naive application of QFI, which leads to a better precision scaling in terms of the number of phases involved.
Other seminars
Giulio Chiribella (University of Hong Kong): Optimal programming of quantum gates - Duplicate27-06-2022
Marco Tomamichel (National University of Singapore): Quantum advantage with noisy shallow circuits17-05-2022
R. Patron (University of Edinburgh): Limitations of optimization algorithms on noisy quantum devices02-03-2022
Marcel Hinsche (FU Berlin): Learnability of the output distributions of local quantum circuits25.05.2022
Julio de Vicente: Genuine multipartite entanglement and nonlocality in pair-entangled network states20.04.2022
Beata Zjawin (ICTQT): Inequality Constraints in Directed Acyclic Graphs with Hidden Variables02.02.2022
Laura Mancinska (QMATH, Copenhagen): Fixed-size schemes for certification of large quantum systems17-11-2021
Yelena Guyanova (IQOQI, Vienna): Ideal Projective Measurements Have Infinite Resource Costs10-11-2021
Hamed Mohammady (ULdB): Measurement disturbance and conservation laws in quantum mechanics03-11-2021