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Exponentially-improved effective descriptions of physical bosonic systems
Varun Upreti, Nicolás Quesada, Ulysse Chabaud
The effective description of a bosonic quantum system identifies the minimum finite dimension required to capture its essential dynamics. This effective dimension plays an importan…
Optimal Waveforms for Dipole Moment Estimation with Coherent States
Karthik Chinni, Nicolás Quesada
We investigate quantum sensing for spectroscopy in a system consisting of a two-level atom coupled to a continuum of modes. We focus on optimizing the pulse shape of a coherent sta…
Linear cross-entropy certification of quantum computational advantage in Gaussian Boson Sampling
Javier Martínez-Cifuentes, Hubert de Guise, Nicolás Quesada
Validation of quantum advantage claims in the context of Gaussian Boson Sampling (GBS) currently relies on providing evidence that the experimental samples genuinely follow their c…
Beyond the parametric approximation: pump depletion, entanglement and squeezing in macroscopic down-conversion
Karthik Chinni, Nicolás Quesada
We study the dynamics of the pump mode in the down-conversion Hamiltonian using the cumulant expansion method, perturbation theory, and the full numerical simulation of systems wit…