6 papers · 1 filter
Fundamental bounds for parameter estimation with few measurements
Valentin Gebhart, Manuel Gessner, Augusto Smerzi
Bounding the optimal precision in parameter estimation tasks is of central importance for technological applications. In the regime of a small number of measurements, or that of lo…
Entanglement Harvesting from Electromagnetic Quantum Fields
Frieder Lindel, Alexa Herter, Valentin Gebhart +2
In many states of the quantum electromagnetic field, including the vacuum state, entanglement exists between different space-time regions -- even space-like separated ones. These c…
Identifying nonclassicality from experimental data using artificial neural networks
Valentin Gebhart, Martin Bohmann, Karsten Weiher +4
The fast and accessible verification of nonclassical resources is an indispensable step towards a broad utilization of continuous-variable quantum technologies. Here, we use machin…
Bayesian Quantum Multiphase Estimation Algorithm
Valentin Gebhart, Augusto Smerzi, Luca Pezzè
Quantum phase estimation (QPE) is the key subroutine of several quantum computing algorithms as well as a central ingredient in quantum computational chemistry and quantum simulati…
Quantifying Computational Advantage of Grover's Algorithm with the Trace Speed
Valentin Gebhart, Luca Pezzè, Augusto Smerzi
Despite intensive research, the physical origin of the speed-up offered by quantum algorithms remains mysterious. No general physical quantity, like, for instance, entanglement, ca…
Topological transition in measurement-induced geometric phases
Valentin Gebhart, Kyrylo Snizhko, Thomas Wellens +3
The state of a quantum system, adiabatically driven in a cycle, may acquire a measurable phase depending only on the closed trajectory in parameter space. Such geometric phases are…