Superior resilience of non-Gaussian entanglement against local Gaussian noises
| Autor: | Filippov, Sergey, Termanova, Alena |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Entropy 25, 75 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3390/e25010075 |
| Popis: | Entanglement distribution task encounters a problem of how the initial entangled state should be prepared in order to remain entangled the longest possible time when subjected to local noises. In the realm of continuous-variable states and local Gaussian channels it is tempting to assume that the optimal initial state with the most robust entanglement is Gaussian too; however, this is not the case. Here we prove that specific non-Gaussian two-mode states remain entangled under the effect of deterministic local attenuation or amplification (Gaussian channels with the attenuation factor/power gain $\kappa_i$ and the noise parameter $\mu_i$ for modes $i=1,2$) whenever $\kappa_1 \mu_2^2 + \kappa_2 \mu_1^2 < \frac{1}{4}(\kappa_1 + \kappa_2) (1 + \kappa_1 \kappa_2)$, which is a strictly larger area of parameters as compared to where Gaussian entanglement is able to tolerate noise. These results shift the ``Gaussian world'' paradigm in quantum information science (within which solutions to optimization problems involving Gaussian channels are supposed to be attained at Gaussian states). Comment: 11 pages, 4 figures |
| Databáze: | arXiv |
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