7 papers
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…
When quantum resources backfire: Non-gaussianity and symplectic coherence in noisy bosonic circuits
Varun Upreti, Ulysse Chabaud, Zoë Holmes +1
Analyzing the impact of noise is of fundamental importance to understand the advantages provided by quantum systems. While the classical simulability of noisy discrete-variable sys…
Symplectic coherence: a measure of position-momentum correlations in quantum states
Varun Upreti, Ulysse Chabaud
The interdependence of position and momentum, as highlighted by the Heisenberg uncertainty principle, is a cornerstone of quantum physics. Yet, position-momentum correlations have…
The symplectic rank of non-Gaussian quantum states
Francesco Anna Mele, Salvatore Francesco Emanuele Oliviero, Varun Upreti +1
Non-Gaussianity is a key resource for achieving quantum advantages in bosonic platforms. Here, we investigate the symplectic rank: a novel non-Gaussianity monotone that satisfies r…
Bounding the computational power of bosonic systems
Varun Upreti, Dorian Rudolph, Ulysse Chabaud
Bosonic quantum systems operate in an infinite-dimensional Hilbert space, unlike discrete-variable quantum systems. This distinct mathematical structure leads to fundamental differ…
Interplay of resources for universal continuous-variable quantum computing
Varun Upreti, Ulysse Chabaud
Quantum resource theories identify the features of quantum computers that provide their computational advantage over classical systems. We investigate the resources driving the com…
An efficient quantum state verification framework and its application to bosonic systems
Varun Upreti, Ulysse Chabaud
Modern quantum devices are highly susceptible to errors, making the verification of their correct operation a critical problem. Usual tomographic methods rapidly become intractable…