39 citations · 81 across the 11 of their papers we have counts for
12 papers
Adaptive Negativity Estimation via Collective Measurements
Martin Zeman, Vojtěch Trávníček, Antonín Černoch +2
This paper explores an efficient method for entanglement quantification in two-qubit and qubit-qutrit quantum systems based upon the framework of collective measurements in conjunc…
Efficient Characterization of N-Beam Gaussian Fields Through Photon-Number Measurements: Quantum Universal Invariants
Nazarii Sudak, Artur Barasiński, Jan Peřina +1
Quantum universal invariants of general N-beam Gaussian fields are investigated from the point of view of fields' intensity moments. A method that uniquely links these invariants,…
Quantum Correlations in Three-Beam Symmetric Gaussian States Accessed via Photon-Number-Resolving Detection and Quantum Universal Invariants
Jan Peřina, Nazarii Sudak, Artur Barasiński +1
Quantum correlations of 3-beam symmetric Gaussian states are analyzed using their quantum universal invariants. These invariants, 1-, 2-, and 3-beam purities, are expressed in term…
Machine classification of quantum correlations for entanglement distribution networks
Jan Soubusta, Antonín Černoch, Karel Lemr
The paper suggest employing machine learning for resource-efficient classification of quantum correlations in entanglement distribution networks. Specifically, artificial neural ne…
Quantifying nonclassicality of vacuum-one-photon superpositions via potentials for Bell nonlocality, quantum steering, and entanglement
Adam Miranowicz, Josef Kadlec, Karol Bartkiewicz +4
Entanglement potentials are popular measures of the nonclassicality of single-mode optical fields. These potentials are defined by the amount of entanglement (measured by, e.g., th…
Measuring concurrence in qubit Werner states without aligned reference frame
Kateřina Jiráková, Artur Barasiński, Antonín Černoch +2
The genuine concurrence is a standard quantifier of multipartite entanglement, detection and quantification of which still remains a difficult problem from both theoretical and exp…
Demonstration of quantum controlled teleportation for discrete variables on linear optical devices
Artur Barasiński, Antonín Černoch, Karel Lemr
We report an experimental implementation of tripartite controlled quantum teleportation on the quantum optical devices. The protocol is performed through bi- and tripartite entangl…
Experimental verification of time-order-dependent correlations in three-qubit Greenberger-Horne-Zeilinger-class states
Artur Barasiński, Antonín Černoch, Karel Lemr +1
In this paper, we investigate the genuine three-way nonlocality which is recognized as the strongest form of tripartite correlations. We consider theoretically and experimentally a…
Experimental construction of a versatile four-photon source
Karol Bartkiewicz, Antonín Černoch, Karel Lemr
The paper discusses technical aspects of constructing a highly versatile multi-photon source. The source is able to generate up to four photons which is sufficient for a large numb…
Experimental measurement of nonlinear entanglement witness by hyper-entangling two-qubit states
Vojtěch Trávníček, Karol Bartkiewicz, Antonín Černoch +1
We demonstrate that non-linear entanglement witnesses can be made particularly useful for entanglement detection in hyper-entangled or multilevel states. We test this idea experime…
Experimental measurement of the collectibility of two-qubit states
Karel Lemr, Karol Bartkiewicz, Antonín Černoch
We present a proof-of-principle experiment demonstrating measurement of the collectibility, a nonlinear entanglement witness proposed by Rudnicki et al. [Phys. Rev. Lett. 107, 1505…
Knowing "where the photons have been"
Karol Bartkiewicz, Antonín Černoch, Dalibor Javůrek +3
Linear-optical interferometers play a key role in designing circuits for quantum information processing and quantum communications. Even though nested Mach-Zehnder interferometers…