Výsledky vyhledávání - "Philipp Hyllus"

Akademický článek

Permutationally invariant state reconstruction

Autor: Tobias Moroder, Philipp Hyllus, Géza Tóth, Christian Schwemmer, Alexander Niggebaum, Stefanie Gaile, Otfried Gühne, Harald Weinfurter

Publikováno v: New Journal of Physics, Vol 14, Iss 10, p 105001 (2012)

Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requir

Externí odkaz: https://doaj.org/article/8fcdbd89f0474c6fb28def70f934fdf9

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Precision bounds for gradient magnetometry with atomic ensembles

Autor: Iagoba Apellaniz, Géza Tóth, Iñigo Urizar-Lanz, Philipp Hyllus, Zoltán Zimborás

We study gradient magnetometry with an ensemble of atoms with arbitrary spin. We calculate precision bounds for estimating the gradient of the magnetic field based on the quantum Fisher information. For quantum states that are invariant under homogen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82eed71b7a8b88262f969048744a1802
https://doi.org/10.17169/refubium-1508

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Detection of entanglement with few local measurements

Autor: Chiara Macchiavello, Dagmar Bruß, Anna Sanpera, Maciej Lewenstein, Artur Ekert, Philipp Hyllus, Otfried Gühne

Publikováno v: Scopus-Elsevier

We introduce a general method for the experimental detection of entanglement by performing only few local measurements, assuming some prior knowledge of the density matrix. The idea is based on the minimal decomposition of witness operators into a ps

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::911f0fc2fc591fb0f658c00cb22ab243
https://ora.ox.ac.uk/objects/uuid:991baaea-8483-48a1-b023-f5d4cd32fd36

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Entanglement Properties of Composite Quantum Systems

Autor: Otfried Gühne, K. Eckert, Jordi Mompart, Florian Hulpke, Philipp Hyllus, Maciej Lewenstein, Dagmar Bruß, Anna Sanpera, J. K. Korbicz

Publikováno v: Quantum Information Processing

We present here an overview of our work concerning entanglement properties of composite quantum systems. The characterization of entanglement, i.e. the possibility to assert if a given quantum state is entangled with others and how much entangled it

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9f1a8a8c1759f3a48e01a5edd2cab76
https://doi.org/10.1002/3527606009.ch7

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[Untitled]

Autor: Philipp Hyllus, Otfried Gühne

Publikováno v: International Journal of Theoretical Physics. 42:1001-1013

In this paper we describe how three qubit entanglement can be analyzed with local measurements. For this purpose we decompose entanglement witnesses into operators which can be measured locally. Our decompositions are optimized in the number of measu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a09740e14351319efe3f40b3858f4aa7
https://doi.org/10.1023/a:1025422606845

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[Untitled]

Autor: Philipp Hyllus, Erik Sjöqvist

Publikováno v: Foundations of Physics. 33:1085-1105

The ideal scalar Aharonov-Bohm (SAB) and Aharonov-Casher (AC) effect involve a magnetic dipole pointing in a certain fixed direction: along a purely time dependent magnetic field in the SAB case and perpendicular to a planar static electric field in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e7f8b69140a3be54875a64f983a5a15b
https://doi.org/10.1023/a:1025637918269

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Phase sensitivity bounds for two-mode interferometers

Autor: Philipp Hyllus, Augusto Smerzi, Luca Pezzè

Publikováno v: arXiv.org e-Print Archive

We provide general bounds of phase estimation sensitivity in linear two-mode interferometers. We consider probe states with a fluctuating total number of particles. With incoherent mixtures of state with different total number of particles, particle

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d296aa7fa42fd3ce4ba89904a76d8dae
http://arxiv.org/abs/1408.6971

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Macroscopic singlet states for gradient magnetometry

Autor: Philipp Hyllus, Iñigo L. Egusquiza, Iñigo Urizar-Lanz, Géza Tóth, Morgan W. Mitchell

Publikováno v: Physical Review A
European Research Council (ERC)
arXiv.org e-Print Archive

We present a method for measuring magnetic field gradients with macroscopic singlet states realized with ensembles of spin-j particles. While the singlet state is completely insensitive to homogeneous magnetic fields, the variance of its collective s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::602f54255af79b9cdc86699333ad2a15
http://arxiv.org/abs/1203.3797

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Four-qubit entangled symmetric states with positive partial transpositions

Autor: Jordi Tura, Remigiusz Augusiak, Marek Kuś, Maciej Lewenstein, J. Samsonowicz, Philipp Hyllus

Publikováno v: Physical Review A
European Research Council (ERC)
arXiv.org e-Print Archive

We solve the open question of the existence of four-qubit entangled symmetric states with positive partial transpositions (PPT states). We reach this goal with two different approaches. First, we propose a half-analytical-half-numerical method that a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f654261c31e96bad4ae82344036132b3
http://arxiv.org/abs/1203.3711

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Entanglement and Extreme Spin Squeezing for a Fluctuating Number of Indistinguishable Particles

Autor: Augusto Smerzi, Philipp Hyllus, Géza Tóth, Luca Pezzè

Publikováno v: Physical review. A 86 (2012): 012337–012337. doi:10.1103/PhysRevA.86.012337
info:cnr-pdr/source/autori:Hyllus, Philipp [ 1,2,3 ] ; Pezze Luca [ 4,5 ] ; Smerzi Augusto [ 2,3,4,5 ] ; Toth Geza [ 1,6,7 ]/titolo:Entanglement and extreme spin squeezing for a fluctuating number of indistinguishable particles/doi:10.1103%2FPhysRevA.86.012337/rivista:Physical review. A/anno:2012/pagina_da:012337/pagina_a:012337/intervallo_pagine:012337–012337/volume:86
Physical Review A
European Research Council (ERC)
arXiv.org e-Print Archive
Physical Review a

We extend the criteria for $k$-particle entanglement from the spin-squeezing parameter presented in S\o{}rensen and M\o{}lmer [Phys. Rev. Lett. 86, 4431 (2001)] to systems with a fluctuating number of particles. We also discuss how other spin-squeezi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf444878d5dcfce854028d1d442ced1c

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