Can Grover’s algorithm speed up search of a physical region—for example a 2-D grid of size √n × √n? The problem is that √n time seems to be needed for each query, just to move amplitude across the grid. Here...
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Here we demonstrate how parahydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance quantum computation. A 12 ns laser pulse is used to i...
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Here we demonstrate how parahydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance quantum computation. A 12 ns laser pulse is used to initiate a chemical reaction involving pure parahydrogen (the nuclear spin singlet of H2). The product, formed on the μs time scale, contains a hydrogen-derived two-spin system with an effective spin-state purity of 0.916. To achieve a comparable result by direct cooling would require an unmanageable (in the liquid state) temperature of 6.4 mK or an impractical magnetic field of 0.45 MT at room temperature. The resulting spin state has an entanglement of formation of 0.822 and cannot be described by local hidden variable models.
The fundamental properties related to the finite convergence of the successive semidefinite programming relaxation method proposed by the authors for approximating the convex hull of F were investigated. F was suppose...
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The fundamental properties related to the finite convergence of the successive semidefinite programming relaxation method proposed by the authors for approximating the convex hull of F were investigated. F was supposed to be a compact subset of the n-dimensional Euclidean space which was described in terms of non empty compact convex subset and a set of quadratic inequalities.
This book constitutes the thoroughly refereed post-workshop proceedings of the 4th Workshop on Theory of quantum Computation, Communication, and Cryptography, TQC 2009, held in Waterloo, Canada, in May 2009. The 10 re...
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ISBN:
(数字)9783642106989
ISBN:
(纸本)9783642106972
This book constitutes the thoroughly refereed post-workshop proceedings of the 4th Workshop on Theory of quantum Computation, Communication, and Cryptography, TQC 2009, held in Waterloo, Canada, in May 2009. The 10 revised papers presented were carefully selected during two rounds of reviewing and improvement. The papers present current original research and focus on theoretical aspects of quantum computation, quantum communication, and quantum cryptography, which are part of a larger interdisciplinary field embedding information science in a quantum mechanical framework. Topics addressed are such as quantum algorithms, models of quantum computation, quantum complexity theory, simulation of quantum systems, quantum cryptography, quantum communication, quantum estimation and measurement, quantum noise, quantum coding theory, fault-tolerant quantumcomputing, and entanglement theory.
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