Zobrazeno 1 - 10
of 204
pro vyhledávání: '"Bartkiewicz, Karol"'
Measuring complex properties in quantum systems, such as various measures of entanglement and Bell nonlocality, is challenging. Traditional methods require a full reconstruction of the density matrix of a given system. An alternative strategy reduces
Externí odkaz:
http://arxiv.org/abs/2411.05745
Publikováno v:
Phys. Rev. A 110, 023720 (2024)
Entanglement potentials (EPs) enable the characterization and quantification of the nonclassicality of single-mode optical fields by measuring the entanglement generated through beam splitting. We experimentally generated single-photon states and tom
Externí odkaz:
http://arxiv.org/abs/2401.15995
Hamiltonian exceptional points (HEPs) are spectral degeneracies of non-Hermitian Hamiltonians describing classical and semiclassical open systems with gain and/or loss. However, this definition overlooks the occurrence of quantum jumps in the evoluti
Externí odkaz:
http://arxiv.org/abs/2401.14993
Autor:
Miranowicz, Adam, Kadlec, Josef, Bartkiewicz, Karol, Černoch, Antonín, Chen, Yueh-Nan, Lemr, Karel, Nori, Franco
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., the negativity or concurrence) of the two-mode field generated by mixing
Externí odkaz:
http://arxiv.org/abs/2309.12930
Publikováno v:
Opt. Express 32, 2333-2346 (2024)
Entanglement potentials are a promising way to quantify the nonclassicality of single-mode states. They are defined by the amount of entanglement (expressed by, e.g., the Wootters concurrence) obtained after mixing the examined single-mode state with
Externí odkaz:
http://arxiv.org/abs/2309.12878
Autor:
Trávníček, Vojtěch, Roik, Jan, Bartkiewicz, Karol, Černoch, Antonín, Horodecki, Paweł, Lemr, Karel
In this paper, we present a supervised learning technique that utilizes artificial neural networks to design new collective entanglement witnesses for two-qubit and qubit-qutrit systems. Machine-designed collective entanglement witnesses allow for co
Externí odkaz:
http://arxiv.org/abs/2307.08293
Autor:
Chimczak, Grzegorz, Kowalewska-Kudłaszyk, Anna, Lange, Ewelina, Bartkiewicz, Karol, Peřina Jr, Jan
Publikováno v:
Scientific Reports volume 13, Article number: 5859 (2023)
We analyse two quantum systems with hidden parity-time (PT) symmetry: one is an optical device, whereas another is a superconducting microwave-frequency device. To investigate their symmetry, we introduce an equilibrium frame, in which loss and gain
Externí odkaz:
http://arxiv.org/abs/2305.08150
Autor:
Abo, Shilan, Soubusta, Jan, Jiráková, Kateřina, Bartkiewicz, Karol, Černoch, Antonín, Lemr, Karel, Miranowicz, Adam
Publikováno v:
Scientific Reports 13, 8564 (2023)
A Werner state, which is the singlet Bell state affected by white noise, is a prototype example of states, which can reveal a hierarchy of quantum entanglement, steering, and Bell nonlocality by controlling the amount of noise. However, experimental
Externí odkaz:
http://arxiv.org/abs/2302.10159
In this paper, we investigate how to reduce the number of measurement configurations needed for sufficiently precise entanglement quantification. Instead of analytical formulae, we employ artificial neural networks to predict the amount of entangleme
Externí odkaz:
http://arxiv.org/abs/2203.01607
Publikováno v:
Sci. Rep. 13, 12893 (2023)
We introduce a new approach towards generative quantum machine learning significantly reducing the number of hyperparameters and report on a proof-of-principle experiment demonstrating our approach. Our proposal depends on collaboration between the g
Externí odkaz:
http://arxiv.org/abs/2112.13255