%0 Journal Article
%J Phys. Rev. B
%D 2019
%T Frustrated quantum spin systems in small triangular lattices studied with a numerical method
%A Castells-Graells, D.
%A Yuste, A.
%A Sanpera, A.
%B Phys. Rev. B
%V 100
%P 155119
%8 Oct
%U https://link.aps.org/doi/10.1103/PhysRevB.100.155119
%R 10.1103/PhysRevB.100.155119
%0 Journal Article
%J Journal of Mathematical Physics
%D 2018
%T Feynman graphs and the large dimensional limit of multipartite entanglement
%A Di Martino, Sara
%A Facchi, Paolo
%A Florio, Giuseppe
%B Journal of Mathematical Physics
%V 59
%P 012201
%8 Jan-01-2018
%U http://aip.scitation.org/doi/10.1063/1.5019481http://aip.scitation.org/doi/pdf/10.1063/1.5019481
%! Journal of Mathematical Physics
%R 10.1063/1.5019481
%0 Journal Article
%J Quantum
%D 2018
%T Fluctuation-dissipation theorem for non-equilibrium quantum systems
%A Mehboudi, Mohammad
%A Sanpera, Anna
%A Parrondo, Juan M. R.
%B Quantum
%V 2
%P 66
%8 Dec-05-2019
%U https://quantum-journal.orghttps://quantum-journal.org/papers/q-2018-05-24-66/
%! Quantum
%R 10.22331/q10.22331/q-2018-05-24-66
%0 Journal Article
%J New Journal of Physics
%D 2017
%T Flexible resources for quantum metrology
%A Friis, Nicolai
%A Orsucci, Davide
%A Skotiniotis, Michalis
%A Sekatski, Pavel
%A Dunjko, Vedran
%A Briegel, Hans J.
%A Dür, Wolfgang
%X Quantum metrology offers a quadratic advantage over classical approaches to parameter estimation problems by utilising entanglement and nonclassicality. However, the hurdle of actually implementing the necessary quantum probe states and measurements, which vary drastically for different metrological scenarios, is usually not taken into account. We show that for a wide range of tasks in metrology, 2D cluster states (a particular family of states useful for measurement-based quantum computation) can serve as flexible resources that allow one to efficiently prepare any required state for sensing, and perform appropriate (entangled) measurements using only single qubit operations. Crucially, the overhead in the number of qubits is less than quadratic, thus preserving the quantum scaling advantage. This is ensured by using a compression to a logarithmically sized space that contains all relevant information for sensing. We specifically demonstrate how our method can be used to obtain optimal scaling for phase and frequency estimation in local estimation problems, as well as for the Bayesian equivalents with Gaussian priors of varying widths. Furthermore, we show that in the paradigmatic case of local phase estimation 1D cluster states are sufficient for optimal state preparation and measurement.
%B New Journal of Physics
%V 19
%P 063044
%U http://stacks.iop.org/1367-2630/19/i=6/a=063044
%R 10.1088/1367-2630/aa7144
%0 Journal Article
%J IEEE Transactions on Information Theory
%D 2017
%T From Log-Determinant Inequalities to Gaussian Entanglement via Recoverability Theory
%A Lami, Ludovico
%A Hirche, Christoph
%A Adesso, Gerardo
%A Winter, Andreas
%B IEEE Transactions on Information Theory
%V 63
%P 7553 - 7568
%8 Jan-11-2017
%U http://ieeexplore.ieee.org/document/8004445/http://xplorestaging.ieee.org/ielx7/18/8071168/08004445.pdf?arnumber=8004445
%! IEEE Trans. Inform. Theory
%R 10.1109/TIT.2017.2737546
%0 Journal Article
%J Journal of Physics A: Mathematical and Theoretical
%D 2014
%T Fifty years of Bell’s theorem
%A Nicolas Brunner
%A Gühne, Otfried
%A Huber, Marcus
%B Journal of Physics A: Mathematical and Theoretical
%V 47
%P 420301
%8 oct
%G eng
%U http://stacks.iop.org/1751-8121/47/i=42/a=420301?key=crossref.9d548f14fc7338685392dcd6228de98d
%R 10.1088/1751-8113/47/42/420301
%0 Journal Article
%J IEEE Transactions on Information Theory
%D 2014
%T Full Security of Quantum Key Distribution From No-Signaling Constraints
%A Masanes, Lluis
%A Renner, Renato
%A Christandl, Matthias
%A Winter, Andreas
%A Barrett, Jonathan
%B IEEE Transactions on Information Theory
%V 60
%P 4973-4986
%8 8/2014
%N 8
%! IEEE Trans. Inform. Theory
%R 10.1109/TIT.2014.2329417
%0 Journal Article
%J Il Nuovo Cimento
%D 2012
%T From Vector Meson Dominance to Quark-Hadron Duality
%A Bramon, Albert
%X A short review of the many contributions to hadron physics made by Mario Greco is presented. The review roughly covers his production between1971 and 1974, just before the advent of QCD, when quark-model ideas, duality principles and vector meson dominance were widely accepted, developed and applied. The present author had the privilege to collaborate with Mario in most of these contributions and looking backward in time to remember the good old days we spent together in Frascati has been a great pleasure.
%B Il Nuovo Cimento
%V 35C
%P 9-14
%U http://arxiv.org/abs/1203.4205
%R 10.1393/ncc/i2012-11133-9
%0 Journal Article
%J Physical Review Letters
%D 2008
%T Frustration, Area Law, and Interference in Quantum Spin Models
%A Sen(De), Aditi
%A Sen, Ujjwal
%A Dziarmaga, Jacek
%A Sanpera, Anna
%A Lewenstein, Maciej
%B Physical Review Letters
%V 101
%P 187202–4
%8 10/2008
%G eng
%U http://link.aps.org/abstract/PRL/v101/e187202
%R 10.1103/PhysRevLett.101.187202
%0 Journal Article
%J Physics Letters B
%D 2004
%T Fixed boundary conditions analysis of the 3d gonihedric Ising model with k=0
%A Baig, Marià
%A Clua, J.
%A Johnston, D. A.
%A Villanova, R.
%K Author Keywords: Spin systems
%K Fixed boundary conditions
%K Gonihedric models
%K Phase transitions
%X The gonihedric Ising model is a particular case of the class of models defined by Savvidy and Wegner intended as discrete versions of string theories on cubic lattices. In this Letter we perform a high statistics analysis of the phase transition exhibited by the 3d gonihedric Ising model with k=0 in the light of a set of recently stated scaling laws applicable to first order phase transitions with fixed boundary conditions. Even though qualitative evidence was presented in a previous paper to support the existence of a first order phase transition at k=0, only now are we capable of pinpointing the transition inverse temperature at $\beta$c=0.54757(63) and of checking the scaling of standard observables.
%B Physics Letters B
%V 585
%P 180–186
%G eng
%U http://www.sciencedirect.com/science?\_ob=ArticleURL&\_udi=B6TVN-4BSN95Y-3&\_user=1517286&\_coverDate=04%2F08%2F2004&\_rdoc=1&\_fmt=high&\_orig=search&\_sort=d&\_docanchor=&view=c&\_acct=C000053449&\_version=1&\_urlVersion=0&\_userid=1517286&md5=b8fb559f9
%R 10.1016/j.physletb.2004.02.002
%0 Journal Article
%J Science (New York, N.Y.)
%D 2001
%T Feynman's path-integral approach for intense-laser-atom interactions
%A Salieres, P.
%A Carre, B.
%A Le Deroff, L.
%A Grasbon, F.
%A Paulus, G. G.
%A Walther, H.
%A Kopold, R.
%A Becker, W.
%A Milosevic, D. B.
%A Sanpera, A.
%A Lewenstein, M.
%X Atoms interacting with intense laser fields can emit electrons and photons of very high energies. An intuitive and quantitative explanation of these highly nonlinear processes can be found in terms of a generalization of classical Newtonian particle trajectories, the so-called quantum orbits. Very few quantum orbits are necessary to reproduce the experimental results. These orbits are clearly identified, thus opening the way for an efficient control as well as previously unknown applications of these processes.
%B Science (New York, N.Y.)
%V 292
%P 902–5
%G eng
%U http://www.sciencemag.org/cgi/content/abstract/292/5518/902
%R 10.1126/science.108836
%0 Conference Paper
%B {2018 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY (ISIT)}
%D 0
%T {Fully Quantum Arbitrarily Varying Channels: Random Coding Capacity and Capacity Dichotomy}
%A Boche, Holger
%A Deppe, Christian
%A Noetzel, Janis
%A Winter, Andreas
%X {We consider a model of communication via a fully quantum jammer channel with quantum jammer, quantum sender and quantum receiver, which we dub quantum arbitrarily varying channel (QAVC). Restricting to finite dimensional user and jammer systems, we show, using permutation symmetry and a de Finetti reduction, how the random coding capacity (classical and quantum) of the QAVC is reduced to the capacity of a naturally associated compound channel, which is obtained by restricting the jammer to i.i.d. input states. Furthermore, we demonstrate that the shared randomness required is at most logarithmic in the block length, via a quantum version of the ``elimination of of correlation{''} using a random matrix tail bound. This implies a dichotomy theorem: either the classical capacity of the QAVC is zero, and then also the quantum capacity is zero, or each capacity equals its random coding variant.}
%B {2018 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY (ISIT)}
%S {IEEE International Symposium on Information Theory}
%I {IEEE; IEEE Informat Theory Soc; NSF; Huawei; Qualcomm}
%P {2012-2016}
%@ {978-1-5386-4781-3}