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10 papers · 2 filters
Efficient entanglement distillation without quantum memory
Daniela Abdelkhalek, Mareike Syllwasschy, Nicolas J. Cerf +2
Entanglement distribution between distant parties is an essential component to most quantum communication protocols. Unfortunately, decoherence effects such as phase noise in optic…
Direct method for measuring and witnessing quantum entanglement of arbitrary two-qubit states through Hong-Ou-Mandel interference
Karol Bartkiewicz, Grzegorz Chimczak, Karel Lemr
We describe a direct method for experimental determination of the negativity of an arbitrary two-qubit state with 11 measurements performed on multiple copies of the two-qubit syst…
Quantum non-Gaussianity from a large ensemble of single photon emitters
Lukáš Lachman, Radim Filip
Quantum attributes of light have been related to non-classicality so far, i. e. to incompatibility with mixtures of coherent states. The progress in quantum optics indicates that t…
Small sets of complementary observables
M. Grassl, D. McNulty, L. Mišta +1
Two observables are called complementary if preparing a physical object in an eigenstate of one of them yields a completely random result in a measurement of the other. We investig…
Gaussian intrinsic entanglement: An entanglement quantifier based on secret correlations
Ladislav Mišta, Richard Tatham
Intrinsic entanglement (IE) is a quantity which aims at quantifying bipartite entanglement carried by a quantum state as an optimal amount of the intrinsic information that can be…
Bell nonlocality and fully-entangled fraction measured in an entanglement-swapping device without quantum state tomography
Karol Bartkiewicz, Karel Lemr, Antonín Černoch +1
We demonstrate an efficient experimental procedure based on entanglement swapping to determine the Bell nonlocality measure of Horodecki et al. [Phys. Lett. A 200, 340 (1995)] and…