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pro vyhledávání: '"Paunković N"'
The fidelity between two infinitesimally close states or the fidelity susceptibility of a system are known to detect quantum phase transitions. Here we show that the k-space fidelity between two states far from each other and taken deep inside (bulk)
Externí odkaz:
http://arxiv.org/abs/1808.06187
Publikováno v:
Phys. Rev. B 98, 245141 (2018)
We study the behaviour of the fidelity and the Uhlmann connection in two-dimensional systems of free fermions that exhibit non-trivial topological behavior. In particular, we use the fidelity and a quantity closely related to the Uhlmann factor in or
Externí odkaz:
http://arxiv.org/abs/1803.05021
Publikováno v:
Entropy 21, 821 (2019)
We present a quantum scheme for signing contracts between two clients (Alice and Bob) using entangled states and the services of a third trusted party (Trent). The trusted party is only contacted for the initialization of the protocol, and possibly a
Externí odkaz:
http://arxiv.org/abs/1711.09843
In this paper we present quantum key distribution protocol that, instead of single qubits, uses mesoscopic coherent states of light $|\alpha\rangle$ to encode bit values of a randomly generated key. Given the reference value $\alpha\in\mathbb C$, and
Externí odkaz:
http://arxiv.org/abs/1609.07064
Publikováno v:
International Journal of Quantum Information, Vol. 13, No. 6 (2015) 1550050
Quantum Cryptography is a rapidly developing field of research that benefits from the properties of Quantum Mechanics in performing cryptographic tasks. Quantum walks are a powerful model for quantum computation and very promising for quantum informa
Externí odkaz:
http://arxiv.org/abs/1602.01404
Publikováno v:
Journal of Physics A: Mathematical and Theoretical, Volume 50, Number 20, 2017
We present a bit-string quantum oblivious transfer protocol based on single-qubit rotations. Our protocol is built upon a previously proposed quantum public-key protocol and its practical security relies on the laws of Quantum Mechanics. Practical se
Externí odkaz:
http://arxiv.org/abs/1407.8146
Oblivious transfer protocol is a basic building block in cryptography and is used to transfer information from a sender to a receiver in such a way that, at the end of the protocol, the sender does not know if the receiver got the message or not. Sin
Externí odkaz:
http://arxiv.org/abs/1403.6022
Publikováno v:
In Annals of Physics February 2019 401:40-58
Publikováno v:
Physical Review A 84, 062318 (2011)
Quantum fidelity between two density matrices, $F(\rho_1,\rho_2)$ is usually defined as the trace of the operator ${\cal F}=\sqrt{\sqrt{\rho_1} \rho_2 \sqrt{\rho_1}}$. We study the logarithmic spectrum of this operator, which we denote by {\it fideli
Externí odkaz:
http://arxiv.org/abs/1107.5931
We present a fair and optimistic quantum contract signing protocol between two clients that requires no communication with the third trusted party during the exchange phase. We discuss its fairness and show that it is possible to design such a protoc
Externí odkaz:
http://arxiv.org/abs/1106.2922