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Metrological Nonlinear Squeezing Parameter
Manuel Gessner, Augusto Smerzi, Luca Pezzè
The well known metrological linear squeezing parameters (such as quadrature or spin squeezing) efficiently quantify the sensitivity of Gaussian states. Yet, these parameters are in…
Multipartite-Entanglement Tomography of a Quantum Simulator
Marco Gabbrielli, Luca Lepori, Luca Pezzè
Multipartite entanglement tomography, namely the quantum Fisher information (QFI) calculated with respect to different collective operators, allows to fully characterize the phase…
Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions
Fabian Wolf, Chunyan Shi, Jan C. Heip +6
Non-vanishing fluctuations of the vacuum state are a salient feature of quantum theory. These fluctuations fundamentally limit the precision of quantum sensors. Nowadays, several s…
Sensitivity Bounds for Multiparameter Quantum Metrology
Manuel Gessner, Luca Pezzè, Augusto Smerzi
We identify precision limits for the simultaneous estimation of multiple parameters in multimode interferometers. Quantum strategies to enhance the multiparameter sensitivity are b…
Multipartite Entanglement at Finite Temperature
Marco Gabbrielli, Augusto Smerzi, Luca Pezzè
The interplay of quantum and thermal fluctuations in the vicinity of a quantum critical point characterizes the physics of strongly correlated systems. Here we investigate this int…
Frequentist and Bayesian Quantum Phase Estimation
Yan Li, Luca Pezzè, Manuel Gessner +2
Frequentist and Bayesian phase estimation strategies lead to conceptually different results on the state of knowledge about the true value of the phase shift. We compare the two fr…