Zobrazeno 1 - 10
of 1 345
pro vyhledávání: '"A Sanpera"'
Sufficient analytical conditions for separability in composite quantum systems are very scarce and only known for low-dimensional cases. Here, we use linear maps and their inverses to derive powerful analytical conditions, providing tight bounds and
Externí odkaz:
http://arxiv.org/abs/2410.22415
In this note we provide a new proof of the $W^{2,p}$ \textit{Calder\'on-Zygmund} regularity estimates for the Laplacian, i.e., $\Delta u=f$ and its parabolic counterpart $\partial_t u-\Delta u=f$. Our proof is an adaptation of a contradiction and com
Externí odkaz:
http://arxiv.org/abs/2407.05882
We investigate the use of a boundary time crystals (BTCs) as sensors of AC fields. Boundary time crystals are non-equilibrium phases of matter in contact to an environment, for which a macroscopic fraction of the many-body system breaks the time tran
Externí odkaz:
http://arxiv.org/abs/2406.06273
Autor:
Beige, Almut, Predojević, Ana, Metelmann, Anja, Sanpera, Anna, Macchiavello, Chiara, Koch, Christiane P., Silberhorn, Christine, Toninelli, Costanza, Bruß, Dagmar, Ercolessi, Elisa, Paladino, Elisabetta, Ferlaino, Francesca, Ferrini, Giulia, Platero, Gloria, Fuentes, Ivette, Nemoto, Kae, Tarruell, Leticia, Bondani, Maria, Chiofalo, Marilu, Pons, Marisa, D'Angelo, Milena, Murao, Mio, Fabbri, Nicole, Verrucchi, Paola, Senellart-Mardon, Pascale, Citro, Roberta, Zambrini, Roberta, González-Férez, Rosario, Maniscalco, Sabrina, Huelga, Susana, Mehlstäubler, Tanja, Parigi, Valentina, Ahufinger, Verónica
Data show that the presence of women in quantum science is affected by a number of detriments and their percentage decreases even further for higher positions. Beyond data, from our shared personal experiences as female tenured quantum physics profes
Externí odkaz:
http://arxiv.org/abs/2407.02612
Autor:
Romero-Pallejà, Jordi, Ahiable, Jennifer, Romancino, Alessandro, Marconi, Carlo, Sanpera, Anna
We investigate the entanglement properties in the symmetric subspace of $N$-partite $d$-dimensional systems (qudits). For diagonal symmetric states, we show that there is no bound entanglement for $d = 3,4 $ and $N = 3$. Further, we present a constru
Externí odkaz:
http://arxiv.org/abs/2403.05244
Publikováno v:
Phys. Rev. Research 6, 023243 (2024)
Local Hamiltonians, $H_k$, describe non-trivial $k$-body interactions in quantum many-body systems. Here, we address the dynamical simulatability of a $k$-local Hamiltonian by a simpler one, $H_{k'}$, with $k'
Externí odkaz:
http://arxiv.org/abs/2310.07054
Publikováno v:
Phys. Rev. A 109, L050203 (2024)
The long range spatial and temporal ordering displayed by discrete time crystals, can become advantageous properties when used for sensing extremely weak signals. Here, we investigate their performance as quantum sensors of weak AC-fields and demonst
Externí odkaz:
http://arxiv.org/abs/2306.03927
Publikováno v:
New Journal of Physics, Vol 20, Iss 4, p 043006 (2018)
First order quantum phase transitions (1QPTs) are signalled, in the thermodynamic limit, by discontinuous changes in the ground state properties. These discontinuities affect expectation values of observables, including spatial correlations. When a 1
Externí odkaz:
https://doaj.org/article/13cee03db5a54c0d903fcd7f5326d1ab
Publikováno v:
Open Systems & Information Dynamics Vol. 29, No. 03, 2250011 (2022)
Physical transformations are described by linear maps that are completely positive and trace preserving (CPTP). However, maps that are positive (P) but not completely positive (CP) are instrumental to derive separability/entanglement criteria. Moreov
Externí odkaz:
http://arxiv.org/abs/2211.02871
Non-locality consists in the existence of non-classical correlations between local measurements. So far, it has been investigated mostly in isolated quantum systems. Here we show that non-local correlations are present, can be detected and might be r
Externí odkaz:
http://arxiv.org/abs/2202.12079