1,720,970 research outputs found
Witnessing multipartite entanglement by detecting asymmetry
Full text linkThe characterization of quantum coherence in the context of quantum information theory and its interplay with quantum correlations is currently subject of intense study. Coherence in a Hamiltonian eigenbasis yields asymmetry, the ability of a quantum system to break a dynamical symmetry generated by the Hamiltonian. We here propose an experimental strategy to witness multipartite entanglement in many-body systems by evaluating the asymmetry with respect to an additive Hamiltonian. We test our scheme by simulating asymmetry and entanglement detection in a three-qubit Greenberger-Horne-Zeilinger (GHZ) diagonal state
Quantum processes which do not use coherence
Full text linkA major signature of quantum mechanics beyond classical physics is coherence, the existence of superposition states. The recently developed resource theory of quantum coherence allows the formalization of incoherent operations-those operations which cannot create coherence. We identify the set of operations which additionally do not use coherence. These are such that coherence cannot be exploited by a classical observer, who measures incoherent properties of the system, to go beyond classical dynamics. We give a physical interpretation in terms of interferometry and prove a dilation theorem, showing how these operations can always be constructed by the system interacting, in an incoherent way, with an ancilla. Such a physical justification is not known for the incoherent operations; thus, our results lead to a physically well-motivated resource theory of coherence. Next, we investigate the implications for coherence in multipartite systems. We show that quantum correlations can be defined naturally with respect to a fixed basis, providing a link between coherence and quantum discord. We demonstrate the interplay between these two quantities in the operations that we study and suggest implications for the theory of quantum discord by relating these operations to those which cannot create discord
Converting Coherence to Quantum Correlations
Full text linkRecent results in quantum information theory characterize quantum coherence in the context of resource theories. Here, we study the relation between quantum coherence and quantum discord, a kind of quantum correlation which appears even in nonentangled states. We prove that the creation of quantum discord with multipartite incoherent operations is bounded by the amount of quantum coherence consumed in its subsystems during the process. We show how the interplay between quantum coherence consumption and creation of quantum discord works in the preparation of multipartite quantum correlated states and in the model of deterministic quantum computation with one qubit
Coherence and quantum correlations measure sensitivity to dephasing channels
Full text linkWe introduce measures of quantum coherence as the speed of evolution of a system under decoherence. That is, coherence is the ability to estimate a dephasing channel, quantified by the quantum Fisher information. We extend the analysis to interferometric noise estimation, proving that quantum discord is the minimum sensitivity to local dephasing. A physically motivated set of free operations for discord is proposed. The amount of discord created by strictly incoherent operations is upper bounded by the initial coherence
N. Avigad, Y. Aharoni, P. Baradon, Y. Yadin, B. Lifshitz, L. Y. Rahmani, H. Nathan, et D. V. Zaitschek. — The Expedition to the Judean Desert. 1960, Jérusalem, 1961
No full textParrot André. N. Avigad, Y. Aharoni, P. Baradon, Y. Yadin, B. Lifshitz, L. Y. Rahmani, H. Nathan, et D. V. Zaitschek. — The Expedition to the Judean Desert. 1960, Jérusalem, 1961. In: Syria. Tome 39 fascicule 3-4, 1962. pp. 333-334
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The Yadin dataset for 25Mg1H
No full textThe dataset is an archive of ExoMol page, https://exomol.com/data/molecules/MgH/25Mg-1H/Yadin. Please check the reference details according to the following description or directly from the website.Definitions file:25Mg-1H__Yadin.defRoot references for ExoMol database: 1. J. Tennyson, S.N. Yurchenko A.F. Al-Refaie, V.H.J. Clark, K.L. Chubb,E.K. Conway, A. Dewan, M.N. Gorman, C. Hill, A.E. Lynas-Gray, T. Mellor, L.K. McKemmish, A. Owens, O.L. Polyansky, M. Semenov, W. Somogyi, G. Tinetti, A. Upadhyay, I. Waldmann, Y. Wang, S. Wright and O.P. Yurchenko, The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres, J. Quant. Spectrosc. Rad. Transf., 255, 107228 (2020).[https://doi.org/10.1016/j.jqsrt.2020.107228.]Yadin: line listRovibrational line lists for BeH, MgH and CaH: 25Mg-1H__Yadin.states.bz2 Energy levels for the Yadin line list for (24Mg)(1H) 25Mg-1H__Yadin.trans.bz2 Energy levels for the Yadin line list for (25Mg)(1H) 25Mg-1H__Yadin.readme Documentation for the Yadin line list for (25Mg)(1H)References: 1. Yadin, B., Veness, T., Conti, P., Hill, C., Yurchenko, S. N., Tennyson, J., "ExoMol line lists – I. The rovibrational spectrum of BeH, MgH and CaH in the X 2Σ+ state", Monthly Notices of the Royal Astronomical Society 425, 34-43 (2012). [http://dx.doi.org/10.1111/j.1365-2966.2012.21367.x][12YaVeCo.XH]Yadin: partition functionRovibrational line lists for BeH, MgH and CaH: 25Mg-1H__Yadin.pf Calculated partition function for (25Mg)(1H) to 5000 KReferences: 1. Yadin, B., Veness, T., Conti, P., Hill, C., Yurchenko, S. N., Tennyson, J., "ExoMol line lists – I. The rovibrational spectrum of BeH, MgH and CaH in the X 2Σ+ state", Monthly Notices of the Royal Astronomical Society 425, 34-43 (2012). [http://dx.doi.org/10.1111/j.1365-2966.2012.21367.x][12YaVeCo.XH
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
The Yadin dataset for 26Mg1H
No full textThe dataset is an archive of ExoMol page, https://exomol.com/data/molecules/MgH/26Mg-1H/Yadin. Please check the reference details according to the following description or directly from the website.Definitions file:26Mg-1H__Yadin.defRoot references for ExoMol database: 1. J. Tennyson, S.N. Yurchenko A.F. Al-Refaie, V.H.J. Clark, K.L. Chubb,E.K. Conway, A. Dewan, M.N. Gorman, C. Hill, A.E. Lynas-Gray, T. Mellor, L.K. McKemmish, A. Owens, O.L. Polyansky, M. Semenov, W. Somogyi, G. Tinetti, A. Upadhyay, I. Waldmann, Y. Wang, S. Wright and O.P. Yurchenko, The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres, J. Quant. Spectrosc. Rad. Transf., 255, 107228 (2020).[https://doi.org/10.1016/j.jqsrt.2020.107228.]Yadin: line listRovibrational line lists for BeH, MgH and CaH: 26Mg-1H__Yadin.states.bz2 Energy levels for the Yadin line list for (26Mg)(1H) 26Mg-1H__Yadin.trans.bz2 Transitions file for the Yadin line list for (26Mg)(1H) 26Mg-1H__Yadin.readme Documentation for the Yadin line list for (26Mg)(1H)References: 1. Yadin, B., Veness, T., Conti, P., Hill, C., Yurchenko, S. N., Tennyson, J., "ExoMol line lists – I. The rovibrational spectrum of BeH, MgH and CaH in the X 2Σ+ state", Monthly Notices of the Royal Astronomical Society 425, 34-43 (2012). [http://dx.doi.org/10.1111/j.1365-2966.2012.21367.x][12YaVeCo.XH]Yadin: partition functionRovibrational line lists for BeH, MgH and CaH: 26Mg-1H__Yadin.pf Calculated partition function for (26Mg)(1H) to 5000 KReferences: 1. Yadin, B., Veness, T., Conti, P., Hill, C., Yurchenko, S. N., Tennyson, J., "ExoMol line lists – I. The rovibrational spectrum of BeH, MgH and CaH in the X 2Σ+ state", Monthly Notices of the Royal Astronomical Society 425, 34-43 (2012). [http://dx.doi.org/10.1111/j.1365-2966.2012.21367.x][12YaVeCo.XH
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