Zobrazeno 1 - 10
of 89
pro vyhledávání: '"De Bièvre, Stephan"'
Given two observables $A$ and $B$, one can associate to every quantum state a Kirkwood-Dirac (KD) quasiprobability distribution. KD distributions are like joint classical probabilities except that they can have negative or nonreal values, which are a
Externí odkaz:
http://arxiv.org/abs/2407.04558
Autor:
Langrenez, Christopher, Salmon, Wilfred, De Bièvre, Stephan, Thio, Jonathan J., Long, Christopher K., Arvidsson-Shukur, David R. M.
A central problem in quantum information is determining quantum-classical boundaries. A useful notion of classicality is provided by the quasiprobability formulation of quantum theory. In this framework, a state is called classical if it is represent
Externí odkaz:
http://arxiv.org/abs/2405.17557
Autor:
Arvidsson-Shukur, David R. M., Braasch Jr., William F., De Bievre, Stephan, Dressel, Justin, Jordan, Andrew N., Langrenez, Christopher, Lostaglio, Matteo, Lundeen, Jeff S., Halpern, Nicole Yunger
The most famous quasi-probability distribution, the Wigner function, has played a pivotal role in the development of a continuous-variable quantum theory that has clear analogues of position and momentum. However, the Wigner function is ill-suited fo
Externí odkaz:
http://arxiv.org/abs/2403.18899
Publikováno v:
Quantum 8, 1360 (2024)
Rigorous derivations of the approach of individual elements of large isolated systems to a state of thermal equilibrium, starting from arbitrary initial states, are exceedingly rare. This is particularly true for quantum mechanical systems. We demons
Externí odkaz:
http://arxiv.org/abs/2312.14290
Publikováno v:
J. Math. Phys. 65, 072201 (2024)
The Kirkwood-Dirac (KD) quasiprobability distribution can describe any quantum state with respect to the eigenbases of two observables $A$ and $B$. KD distributions behave similarly to classical joint probability distributions but can assume negative
Externí odkaz:
http://arxiv.org/abs/2306.00086
Autor:
Armaroli, Andrea, Dujardin, Guillaume, Kudlinski, Alexandre, Mussot, Arnaud, De Bièvre, Stephan, Conforti, Matteo
We study modulational instability in a dispersion-managed system where the sign of the group-velocity dispersion is changed at uniformly distributed random distances around a reference length. An analytical technique is presented to estimate the inst
Externí odkaz:
http://arxiv.org/abs/2211.16326
Publikováno v:
Phys. Rev. A 108, 023730 (2023)
Assessing whether a quantum state $\hat \rho$ is nonclassical ($\textit{i.e.}$, incompatible with a mixture of coherent states) is a ubiquitous question in quantum optics, yet a nontrivial experimental task because many nonclassicality witnesses are
Externí odkaz:
http://arxiv.org/abs/2211.12992
Autor:
De Bievre, Stephan
Publikováno v:
J. Math. Phys. 64, 022202 (2023)
We provide an in-depth study of the recently introduced notion of completely incompatible observables and its links to the support uncertainty and to the Kirkwood-Dirac nonclassicality of pure quantum states. The latter notion has recently been prove
Externí odkaz:
http://arxiv.org/abs/2207.07451
Autor:
Hertz, Anaelle, De Bièvre, Stephan
Photon addition and subtraction render Gaussian states non-Gaussian. We provide a quantitative analysis of the change in nonclassicality produced by these processes by analyzing the Wigner negativity and quadrature coherence scale (QCS) of the result
Externí odkaz:
http://arxiv.org/abs/2204.06358
Autor:
Armaroli, Andrea, Dujardin, Guillaume, Kudlinski, Alexandre, Mussot, Arnaud, Trillo, Stefano, De Bièvre, Stephan, Conforti, Matteo
We study modulational instability (MI) in optical fibers with random group-velocity dispersion (GVD). We consider Gaussian and dichotomous colored stochastic processes. We resort to different analytical methods (namely, the cumulant expansion and the
Externí odkaz:
http://arxiv.org/abs/2111.13691