00489nas a2200145 4500008003900000245009700039210006900136260000800205300001100213490000800224100002500232700001400257700001500271856005700286 2019 d00aFrustrated quantum spin systems in small triangular lattices studied with a numerical method0 aFrustrated quantum spin systems in small triangular lattices stu cOct a1551190 v1001 aCastells-Graells, D.1 aYuste, A.1 aSanpera, A uhttps://link.aps.org/doi/10.1103/PhysRevB.100.15511900565nas a2200157 4500008003900000022001400039245009000053210006900143260001600212300001100228490000700239100002100246700001800267700002100285856010100306 2018 d a0022-248800aFeynman graphs and the large dimensional limit of multipartite entanglement0 aFeynman graphs and the large dimensional limit of multipartite e cJan-01-2018 a0122010 v591 aDi Martino, Sara1 aFacchi, Paolo1 aFlorio, Giuseppe uhttp://aip.scitation.org/doi/10.1063/1.5019481http://aip.scitation.org/doi/pdf/10.1063/1.501948100505nas a2200145 4500008003900000245007200039210006900111260001600180300000700196490000600203100002300209700001800232700002600250856008300276 2018 d00aFluctuation-dissipation theorem for non-equilibrium quantum systems0 aFluctuationdissipation theorem for nonequilibrium quantum system cDec-05-2019 a660 v21 aMehboudi, Mohammad1 aSanpera, Anna1 aParrondo, Juan, M. R. uhttps://quantum-journal.orghttps://quantum-journal.org/papers/q-2018-05-24-66/01879nas a2200205 4500008003900000022001400039245004500053210004500098300001100143490000700154520131600161100001901477700002001496700002601516700002001542700001901562700002101581700001901602856005201621 2017 d a1367-263000aFlexible resources for quantum metrology0 aFlexible resources for quantum metrology a0630440 v193 aQuantum 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.1 aFriis, Nicolai1 aOrsucci, Davide1 aSkotiniotis, Michalis1 aSekatski, Pavel1 aDunjko, Vedran1 aBriegel, Hans, J1 aDür, Wolfgang uhttp://stacks.iop.org/1367-2630/19/i=6/a=06304400626nas a2200169 4500008003900000022001400039245008900053210006900142260001600211300001600227490000700243100001900250700002200269700002000291700002000311856012500331 2017 d a0018-944800aFrom Log-Determinant Inequalities to Gaussian Entanglement via Recoverability Theory0 aFrom LogDeterminant Inequalities to Gaussian Entanglement via Re cJan-11-2017 a7553 - 75680 v631 aLami, Ludovico1 aHirche, Christoph1 aAdesso, Gerardo1 aWinter, Andreas uhttp://ieeexplore.ieee.org/document/8004445/http://xplorestaging.ieee.org/ielx7/18/8071168/08004445.pdf?arnumber=800444500478nas a2200157 4500008004100000022002500041245003600066210003400102260000800136300001100144490000700155100002100162700002000183700001800203856009900221 2014 eng d a1751-8113, 1751-812100aFifty years of Bell’s theorem0 aFifty years of Bell s theorem coct a4203010 v471 aBrunner, Nicolas1 aGühne, Otfried1 aHuber, Marcus uhttp://stacks.iop.org/1751-8121/47/i=42/a=420301?key=crossref.9d548f14fc7338685392dcd6228de98d00632nas a2200181 4500008003900000022001400039245007600053210006900129260001100198300001400209490000700223100001900230700001900249700002500268700002000293700002200313856011500335 2014 d a1557-965400aFull Security of Quantum Key Distribution From No-Signaling Constraints0 aFull Security of Quantum Key Distribution From NoSignaling Const c8/2014 a4973-49860 v601 aMasanes, Lluis1 aRenner, Renato1 aChristandl, Matthias1 aWinter, Andreas1 aBarrett, Jonathan uhttp://grupsderecerca.uab.cat/giq/publications/full-security-quantum-key-distribution-no-signaling-constraints00859nas a2200121 4500008003900000245005600039210005500095300000900150490000800159520051600167100001900683856003500702 2012 d00aFrom Vector Meson Dominance to Quark-Hadron Duality0 aFrom Vector Meson Dominance to QuarkHadron Duality a9-140 v35C3 aA 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.1 aBramon, Albert uhttp://arxiv.org/abs/1203.420500525nas a2200169 4500008004100000245006700041210006500108260001200173300001500185490000800200100001900208700001600227700002100243700001800264700002300282856005000305 2008 eng d00aFrustration, Area Law, and Interference in Quantum Spin Models0 aFrustration Area Law and Interference in Quantum Spin Models c10/2008 a187202–40 v1011 aSen(De), Aditi1 aSen, Ujjwal1 aDziarmaga, Jacek1 aSanpera, Anna1 aLewenstein, Maciej uhttp://link.aps.org/abstract/PRL/v101/e18720201568nas a2200205 4500008004100000245008100041210006900122300001400191490000800205520071700213653003400930653003000964653002200994653002201016100001701038700001201055700001801067700001701085856026001102 2004 eng d00aFixed boundary conditions analysis of the 3d gonihedric Ising model with k=00 aFixed boundary conditions analysis of the 3d gonihedric Ising mo a180–1860 v5853 aThe 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.10aAuthor Keywords: Spin systems10aFixed boundary conditions10aGonihedric models10aPhase transitions1 aBaig, Marià1 aClua, J1 aJohnston, D A1 aVillanova, R uhttp://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=b8fb559f901228nas a2200253 4500008004100000022001400041245007300055210006900128300001200197490000800209520052100217100001600738700001300754700001700767700001500784700001600799700001500815700001400830700001400844700001900858700001500877700001800892856006400910 2001 eng d a0036-807500aFeynman's path-integral approach for intense-laser-atom interactions0 aFeynmans pathintegral approach for intenselaseratom interactions a902–50 v2923 aAtoms 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.1 aSalieres, P1 aCarre, B1 aLe Deroff, L1 aGrasbon, F1 aPaulus, G G1 aWalther, H1 aKopold, R1 aBecker, W1 aMilosevic, D B1 aSanpera, A1 aLewenstein, M uhttp://www.sciencemag.org/cgi/content/abstract/292/5518/90201506nas a2200169 4500008003700000020002400037245009600061210006900157260006000226300001600286520090900302100001801211700002101229700001901250700002001269856004701289 0 d a{978-1-5386-4781-3}00a{Fully Quantum Arbitrarily Varying Channels: Random Coding Capacity and Capacity Dichotomy}0 aFully Quantum Arbitrarily Varying Channels Random Coding Capacit b{IEEE; IEEE Informat Theory Soc; NSF; Huawei; Qualcomm} a{2012-2016}3 a{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.}1 aBoche, Holger1 aDeppe, Christian1 aNoetzel, Janis1 aWinter, Andreas uhttp://grupsderecerca.uab.cat/giq/node/924