83 citations · 225 across the 15 of their papers we have counts for
5 papers · 1 filter
Measuring distances in Hilbert space by many-particle interference
Karol Bartkiewicz, Vojtěch Trávníček, Karel Lemr
The measures of distances between points in a Hilbert space are one of the basic theoretical concepts used to characterize properties of a quantum system with respect to some etalo…
Experimentally attacking quantum money schemes based on quantum retrieval games
Kateřina Jiráková, Karol Bartkiewicz, Antonín Černoch +1
The concept of quantum money (QM) was proposed by Wiesner in the 1970s. Its main advantage is that every attempt to copy QM unavoidably leads to imperfect counterfeits. In the Wies…
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…
Implementation of an efficient linear-optical quantum router
Karol Bartkiewicz, Antonín Černoch, Karel Lemr
In this paper, we report on experimental implementation of a linear-optical quantum router. Our device allows single-photon polarization-encoded qubits to be routed coherently into…