Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Pal, Karoly F"'
Publikováno v:
New J. Phys. 26, 063012 (2024)
Self-testing is a promising approach to certifying quantum states or measurements. Originally, it relied solely on the outcome statistics of the measurements involved in a device-independent (DI) setup. Extra physical assumptions about the system mak
Externí odkaz:
http://arxiv.org/abs/2406.08661
Self-testing is a powerful method for certifying quantum systems. Initially proposed in the device-independent (DI) setting, self-testing has since been relaxed to the semi-device-independent (semi-DI) setting. In this study, we focus on the self-tes
Externí odkaz:
http://arxiv.org/abs/2306.07248
Publikováno v:
Phys. Rev. Lett. 131, 250802 (2023)
We consider communication scenarios where one party sends quantum states of known dimensionality $D$, prepared with an untrusted apparatus, to another, distant party, who probes them with uncharacterized measurement devices. We prove that, for any en
Externí odkaz:
http://arxiv.org/abs/2306.00730
Autor:
Pál, Károly F., Vértesi, Tamás
Publikováno v:
Quantum 6, 756 (2022)
In this paper we study the Platonic Bell inequalities for all possible dimensions. There are five Platonic solids in three dimensions, but there are also solids with Platonic properties (also known as regular polyhedra) in four and higher dimensions.
Externí odkaz:
http://arxiv.org/abs/2112.03887
Publikováno v:
Phys. Rev. Research 3, 023101 (2021)
Bipartite entangled quantum states with a positive partial transpose (PPT), i.e., PPT entangled states, are usually considered very weakly entangled. Since no pure entanglement can be distilled from them, they are also called bound entangled. In this
Externí odkaz:
http://arxiv.org/abs/2002.12409
Autor:
Pál, Károly F., Vértesi, Tamás
Publikováno v:
Phys. Rev. A 100, 012310 (2019)
Entangled states with a positive partial transpose (so-called PPT states) are central to many interesting problems in quantum theory. On one hand, they are considered to be weakly entangled, since no pure state entanglement can be distilled from them
Externí odkaz:
http://arxiv.org/abs/1904.08282
Akademický článek
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Autor:
Kurzynski, Pawel, Laskowski, Wieslaw, Kolodziejski, Adrian, Pal, Karoly F., Ryu, Junghee, Vertesi, Tamas
Publikováno v:
Comm. Phys. 2, 15 (2019)
The squares of the three components of the spin-s operators sum up to $s(s+1)$. However, a similar relation is rarely satisfied by the set of possible spin projections onto mutually orthogonal directions. This has fundamental consequences if one trie
Externí odkaz:
http://arxiv.org/abs/1806.06637
Autor:
Pal, Karoly F, Vertesi, Tamas
Publikováno v:
Phys. Rev. A 96, 022123 (2017)
We construct ($d\times d$)-dimensional bound entangled states, which violate, for any $d>2$, a bipartite Bell inequality introduced in this paper. We conjecture that the proposed class of Bell inequalities acts as a dimension witness for bound entang
Externí odkaz:
http://arxiv.org/abs/1704.08600
Autor:
Pal, Karoly F., Vertesi, Tamas
Publikováno v:
Phys. Rev. A 92, 052104 (2015)
We define a family of binary outcome $n$-party $m\leq n$ settings per party Bell inequalities whose members require the least detection efficiency for their violation among all known inequalities of the same type. This gives upper bounds for the mini
Externí odkaz:
http://arxiv.org/abs/1508.01494