Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Karol Horodecki"'
Publikováno v:
npj Quantum Information, Vol 9, Iss 1, Pp 1-11 (2023)
Abstract The Kochen-Specker (KS) theorem is a cornerstone result in the foundations of quantum mechanics describing the fundamental difference between quantum theory and classical non-contextual theories. Recently specific substructures termed 01-gad
Externí odkaz:
https://doaj.org/article/6379711a4c2343d79a1788fd1b525de9
Autor:
Marek Winczewski, Tamoghna Das, John H. Selby, Karol Horodecki, Paweł Horodecki, Łukasz Pankowski, Marco Piani, Ravishankar Ramanathan
Publikováno v:
Quantum, Vol 7, p 1159 (2023)
Deriving quantum mechanics from information-theoretic postulates is a recent research direction taken, in part, with the view of finding a beyond-quantum theory; once the postulates are clear, we can consider modifications to them. A key postulate is
Externí odkaz:
https://doaj.org/article/ac18bd7a01dc4855b3b2232473608553
Autor:
Karol Horodecki, Jingfang Zhou, Maciej Stankiewicz, Roberto Salazar, Paweł Horodecki, Robert Raussendorf, Ryszard Horodecki, Ravishankar Ramanathan, Emily Tyhurst
Publikováno v:
New Journal of Physics, Vol 25, Iss 7, p 073003 (2023)
Quantum contextuality is one of the most recognized resources in quantum communication and computing scenarios. We provide a new quantifier of this resource, the rank of contextuality (RC). We define RC as the minimum number of non-contextual behavio
Externí odkaz:
https://doaj.org/article/006b4f6ede2d4705a6b9a80dd9961830
Publikováno v:
Physical Review X, Vol 11, Iss 4, p 041016 (2021)
We consider the distribution of secret keys, both in a bipartite and a multipartite (conference) setting, via a quantum network and establish a framework to obtain bounds on the achievable rates. We show that any multipartite private state—the outp
Externí odkaz:
https://doaj.org/article/ee10c01e1a82406b8d3b69280ec2e4d3
Publikováno v:
Entropy, Vol 23, Iss 9, p 1182 (2021)
We investigate whether the heart rate can be treated as a semi-random source with the aim of amplification by quantum devices. We use a semi-random source model called ε-Santha–Vazirani source, which can be amplified via quantum protocols to obtai
Externí odkaz:
https://doaj.org/article/46d2963c64694624863ad9b105049945
Autor:
Fernando G. S. L. Brandão, Ravishankar Ramanathan, Andrzej Grudka, Karol Horodecki, Michał Horodecki, Paweł Horodecki, Tomasz Szarek, Hanna Wojewódka
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016)
Quantum mechanics allows to generate nearly ideal random strings from initially weak random sources, important for security of data systems, but this remains elusive in practice. Here the authors propose a realistic, error-tolerant and secure protoco
Externí odkaz:
https://doaj.org/article/0732deb71054410fb2249885822f5961
Publikováno v:
Physical Review Research, Vol 2, Iss 4, p 043022 (2020)
A significant number of servers that constitute the Internet are to provide private data via private communication channels to mutually anonymous registered users. Such are the servers of banks, hospitals that provide cloud storage and many others. R
Externí odkaz:
https://doaj.org/article/b25d29f190a646fbb16e7681a1470762
Autor:
Ravishankar Ramanathan, Monika Rosicka, Karol Horodecki, Stefano Pironio, Michał Horodecki, Paweł Horodecki
Publikováno v:
Quantum, Vol 4, p 308 (2020)
The Kochen-Specker theorem is a fundamental result in quantum foundations that has spawned massive interest since its inception. We show that within every Kochen-Specker graph, there exist interesting subgraphs which we term $01$-gadgets, that captur
Externí odkaz:
https://doaj.org/article/1b7dc632292347b2b43daffcf75eb999
Autor:
Karol Horodecki, Maciej Stankiewicz
Publikováno v:
New Journal of Physics, Vol 22, Iss 2, p 023007 (2020)
The seminal idea of quantum money, not forgeable due to laws of Quantum Mechanics, proposed by Stephen Wiesner, has laid the foundations for the Quantum Information Theory in the early ’70s. Recently, several other schemes for quantum currencies ha
Externí odkaz:
https://doaj.org/article/d644acac04dc4a3cb69ae60374815dac
Publikováno v:
Physical Review A. 107
We analyze recent approaches to quantum Markovianity and how they relate to the proper definition of quantum memory. We point out that the well-known criterion of information backflow may not correctly report character of the memory falsely signaling