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61دورية أكاديمية
المؤلفون: BISIO, ALESSANDRO, D'ARIANO, GIACOMO, PERINOTTI, PAOLO, Sedlak M.
المساهمون: Bisio, Alessandro, D'Ariano, Giacomo, Perinotti, Paolo, Sedlak, M.
مصطلحات موضوعية: Quantum Computing, Quantum Information, Quantum Algorithm, Quantum protocols
الوصف: We consider the problem of minimizing the ancillary systems required to realize an arbitrary strategy of a quantum protocol, with the assistance of classical memory. For this purpose we introduce the notion of memory cost of a strategy to measure the resources required in terms of ancillary dimension. We provide a condition for the cost to be equal to a given value, and we use this result to evaluate the cost in some special cases. As an example, we show that any covariant protocol for the cloning of a unitary transformation requires at most one ancillary qubit. We also prove that the memory cost has to be determined globally and cannot be calculated by optimizing the resources independently at each step of the strategy.
العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000302169300002; volume:85; firstpage:032333; numberofpages:8; journal:PHYSICAL REVIEW A; http://hdl.handle.net/11571/511246Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84859256953; http://journals.aps.org/pra/abstract/10.1103/PhysRevA.85.032333Test
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62دورية أكاديمية
المؤلفون: BISIO, ALESSANDRO, D'ARIANO, GIACOMO, PERINOTTI, PAOLO, G. Chiribella
المساهمون: Bisio, Alessandro, G., Chiribella, D'Ariano, Giacomo, Perinotti, Paolo
مصطلحات موضوعية: Quantum Information, Quantum Mechanic, Quantum Computing, Quantum comb, Quantum protocol, quantum networks
الوصف: In this work we present a general mathematical framework to deal with Quantum Networks, i.e. networks resulting from the interconnection of elementary quantum circuits. The cornerstone of our approach is a generalization of the Choi isomorphism that allows one to efficiently represent any given Quantum Network in terms of a single positive operator. Our formalism allows one to face and solve many quantum information processing problems that would be hardly manageable otherwise, the most relevant of which are reviewed in this work: quantum process tomography, quantum cloning and learning of transformations, inversion of a unitary gate, information-disturbance tradeoff in estimating a unitary transformation, cloning and learning of a measurement device.
العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000297243500001; volume:61; issue:3; firstpage:273; journal:ACTA PHYSICA SLOVACA; http://hdl.handle.net/11571/582093Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-81155123542; http://www.physics.sk/aps/pub.php?y=2011&pub=aps-11-03Test
الإتاحة: https://doi.org/10.2478/v10155-011-0003-9Test
http://hdl.handle.net/11571/582093Test
http://www.physics.sk/aps/pub.php?y=2011&pub=aps-11-03Test -
63دورية أكاديمية
المساهمون: Bisio, Alessandro, Chiribella, Giulio, D'Ariano, Giacomo, Perinotti, Paolo
مصطلحات موضوعية: Quantum Information, Quantum Computation, Quantum Measurements
الوصف: A single-party strategy in a multiround quantum protocol can be implemented by sequential networks of quantum operations connected by internal memories. Here, we provide an efficient realization in terms of computational-space resources.
وصف الملف: STAMPA
العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000287711800005; volume:83; firstpage:022325; numberofpages:4; journal:PHYSICAL REVIEW A; http://hdl.handle.net/11571/224505Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79952076521
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64دورية أكاديمية
المؤلفون: BISIO, ALESSANDRO, CHIRIBELLA, GIULIO, D'ARIANO, GIACOMO, FACCHINI, STEFANO, PERINOTTI, PAOLO
المساهمون: Bisio, Alessandro, Chiribella, Giulio, D'Ariano, Giacomo, Facchini, Stefano, Perinotti, Paolo
مصطلحات موضوعية: Quantum Information, Foundations of Quantum Mechanics
الوصف: We study quantum learning algorithms for quantum measurements. The optimal learning algorithm is derived for arbitrary von Neumann measurements in the case of training with one or two examples. The analysis of the case of three examples reveals that, differently from the learning of unitary gates, the optimal algorithm for learning of quantum measurements cannot be parallelized, and requires quantum memories for the storage of information.
وصف الملف: STAMPA
العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000276262500073; volume:81; firstpage:032324; numberofpages:10; journal:PHYSICAL REVIEW A; http://hdl.handle.net/11571/223109Test
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65دورية أكاديمية
المؤلفون: BISIO, ALESSANDRO, CHIRIBELLA, GIULIO, D'ARIANO, GIACOMO, FACCHINI, STEFANO, PERINOTTI, PAOLO
المساهمون: Bisio, Alessandro, Chiribella, Giulio, D'Ariano, Giacomo, Facchini, Stefano, Perinotti, Paolo
مصطلحات موضوعية: Quantum mechanics and Quantum Information, Quantum Tomography, Quantum Information, Foundations of Quantum Mechanics
الوصف: The present short review article illustrates the lat- est theoretical developments on quantum tomography, regarding general optimization methods for both data processing and setup. The basic theoretical tool is the informationally complete measure- ment. The optimization theory for the setup is based on the new theoretical approach of quantum combs.
وصف الملف: ELETTRONICO
العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000272488200010; volume:15; firstpage:1646; numberofpages:15; journal:IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS; http://hdl.handle.net/11571/207188Test
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66دورية أكاديمية
المؤلفون: BISIO, ALESSANDRO, CHIRIBELLA, GIULIO, D'ARIANO, GIACOMO, FACCHINI, STEFANO, PERINOTTI, PAOLO
المساهمون: Bisio, Alessandro, Chiribella, Giulio, D'Ariano, Giacomo, Facchini, Stefano, Perinotti, Paolo
مصطلحات موضوعية: QUANTUM MECHANICS, QUANTUM TOMOGRAPHY, QUANTUM MEASUREMENTS, QUANTUM INFORMATION
الوصف: The first complete optimization of quantum tomography, for states, positive operator value measures, and various classes of transformations, for arbitrary prior ensemble and arbitrary representation, is presented. Corresponding feasible experimental schemes in terms of random Bell measurements are given.
وصف الملف: STAMPA
العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000262355000004; volume:102; firstpage:010404-1; lastpage:010404-4; journal:PHYSICAL REVIEW LETTERS; http://hdl.handle.net/11571/141206Test; http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000102000001010404000001&idtype=cvips&gifs=yesTest
الإتاحة: https://doi.org/10.1103/PhysRevLett.102.010404Test
http://hdl.handle.net/11571/141206Test
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000102000001010404000001&idtype=cvips&gifs=yesTest -
67دورية أكاديمية
المؤلفون: Dall’Arno, Michele, Bisio, Alessandro, D’Ariano, Giacomo Mauro, Miková, Martina, Ježek, Miroslav, Dušek, Miloslav
المصدر: Physical Review A ; volume 85, issue 1 ; ISSN 1050-2947 1094-1622
مصطلحات موضوعية: Atomic and Molecular Physics, and Optics
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68دورية أكاديمية
الوصف: We address the problem of the information-disturbance tradeoff associated to the estimation of a quantum transformation and show how the extraction of information about a black box causes a perturbation of the corresponding input-output evolution. In the case of a black box performing a unitary transformation, randomly distributed according to the invariant measure, we give a complete solution of the problem, deriving the optimal tradeoff curve and presenting an explicit construction of the optimal quantum network. © 2010 The American Physical Society. ; Link_to_subscribed_fulltext
العلاقة: Physical Review A - Atomic, Molecular, and Optical Physics; Physical Review A - Atomic, Molecular, and Optical Physics, 2010, v. 82, n. 6; WOS:000286733300006; eid_2-s2.0-78650997393; http://hdl.handle.net/10722/213133Test; 82
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69دورية أكاديمية
المصدر: Foundations of Physics; Oct2015, Vol. 45 Issue 10, p1203-1221, 19p, 1 Chart, 4 Graphs
مصطلحات موضوعية: WEYL'S problem, DIRAC equation, CELLULAR automata, MAXWELL equations, QUANTUM field theory, PLANCK scale
مستخلص: Recent advances on quantum foundations achieved the derivation of free quantum field theory from general principles, without referring to mechanical notions and relativistic invariance. From the aforementioned principles a quantum cellular automata (QCA) theory follows, whose relativistic limit of small wave-vector provides the free dynamics of quantum field theory. The QCA theory can be regarded as an extended quantum field theory that describes in a unified way all scales ranging from an hypothetical discrete Planck scale up to the usual Fermi scale. The present paper reviews the automaton theory for the Weyl field, and the composite automata for Dirac and Maxwell fields. We then give a simple analysis of the dynamics in the momentum space in terms of a dispersive differential equation for narrowband wave-packets. We then review the phenomenology of the free-field automaton and consider possible visible effects arising from the discreteness of the framework. We conclude introducing the consequences of the automaton dispersion relation, leading to a deformed Lorentz covariance and to possible effects on the thermodynamics of ideal gases. [ABSTRACT FROM AUTHOR]
: Copyright of Foundations of Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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70دورية أكاديمية
المصدر: Foundations of Physics; Oct2015, Vol. 45 Issue 10, p1137-1152, 16p, 1 Diagram
مصطلحات موضوعية: QUANTUM field theory, CELLULAR automata, NONABELIAN groups, PLANCK scale, COVARIANCE matrices, CAYLEY graphs
مستخلص: After leading to a new axiomatic derivation of quantum theory (see D'Ariano et al. in Found Phys, ), the new informational paradigm is entering the domain of quantum field theory, suggesting a quantum automata framework that can be regarded as an extension of quantum field theory to including an hypothetical Planck scale, and with the usual quantum field theory recovered in the relativistic limit of small wave-vectors. Being derived from simple principles (linearity, unitarity, locality, homogeneity, isotropy, and minimality of dimension), the automata theory is quantum ab-initio, and does not assume Lorentz covariance and mechanical notions. Being discrete it can describe localized states and measurements (unmanageable by quantum field theory), solving all the issues plaguing field theory originated from the continuum. These features make the theory an ideal framework for quantum gravity, with relativistic covariance and space-time emergent solely from the interactions, and not assumed a priori. The paper presents a synthetic derivation of the automata theory, showing how the principles lead to a description in terms of a quantum automaton over a Cayley graph of a group. Restricting to Abelian groups we show how the automata recover the Weyl, Dirac and Maxwell dynamics in the relativistic limit. We conclude with some new routes about the more general scenario of non-Abelian Cayley graphs. The phenomenology arising from the automata theory in the ultra-relativistic domain and the analysis of corresponding distorted Lorentz covariance is reviewed in Bisio et al. (Found Phys , in this same issue). [ABSTRACT FROM AUTHOR]
: Copyright of Foundations of Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
