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19 papers · 2 filters
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…
Quantifying entanglement of a two-qubit system via measurable and invariant moments of its partially transposed density matrix
Karol Bartkiewicz, Jiří Beran, Karel Lemr +2
We describe a direct method to determine the negativity of an arbitrary two-qubit state in experiments. The method is derived by analyzing the relation between the purity, negativi…
Information-theoretic Bell inequalities based on Tsallis entropy
Marek Wajs, Pawel Kurzynski, Dagomir Kaszlikowski
We numerically investigate entropic Bell inequalities for a pair of entangled qutrits using information-theoretic distances. We show that for this class of inequalities Tsallis ent…
Experimental implementation of optimal linear-optical controlled-unitary gates
Karel Lemr, Karol Bartkiewicz, Antonín Černoch +2
We show that it is possible to reduce the number of two-qubit gates needed for the construction of an arbitrary controlled-unitary transformation by up to two times using a tunable…
Quantum advantage for distributed computing without communication
L. Czekaj, M. Pawlowski, T. Vertesi +3
Understanding the role that quantum entanglement plays as a resource in various information processing tasks is one of the crucial goals of quantum information theory. Here we prop…
Quantum state tomography of large nuclear spins in a semiconductor quantum well: Optimal robustness against errors as quantified by condition numbers
Adam Miranowicz, Sahin K. Ozdemir, Jiri Bajer +4
We discuss methods of quantum state tomography for solid-state systems with a large nuclear spin in nanometer-scale semiconductors devices based on a quantum well. Due to q…