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The Road Continues South:China’s Expansion of the Belt and Road Investment in Latin America

China Today 2019年第4期68卷 14-16页

作者： luis alberto lacalle 不详

SIX years after Chinese President Xi Jinping proposed the Belt and Road Initiative (BRI), it remains the world’s most ambitious investment plan. The opportunities that the BRI offers in facilitating prosperity through developing trade links and creating jobs are unparalleled. However, for the BRI to achieve its boldest aspirations, participating countries in Latin America, including Uruguay, must also work domestically and with China to adopt complementary policies that promote long-term, responsible, and sustainable economic growth.

关键词： President after most BRI its

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Quantum Codes Do Not Increase Fidelity against Isotropic Errors

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Journal of Applied Mathematics and Physics 2023年第2期11卷 555-571页

作者： Jesús lacalle luis Miguel Pozo-Coronado André Luiz Fonseca de Oliveira Rafael Martín-Cuevas Dep. de Matemática Aplicada a las TIC ETS de Ingeniería de Sistemas Informáticos Universidad Politécnica de Madrid C/Alan Turing s/n Madrid Spain Facultad de Ingeniería Universidad ORT Uruguay Montevideo Uruguay Programa de Doctorado en Ciencias y Tecnologías de la Computación para Smart Cities ETS de Ingeniería de Sistemas Informáticos Universidad Politécnica de Madrid C/Alan Turing s/n Madrid Spain

In this article, we study the ability of error-correcting quantum codes to increase the fidelity of quantum states throughout a quantum computation. We analyze arbitrary quantum codes that encode all qubits involved in the computation, and we study the evolution of n-qubit fidelity from the end of one application of the correcting circuit to the end of the next application. We assume that the correcting circuit does not introduce new errors, that it does not increase the execution time (i.e. its application takes zero seconds) and that quantum errors are isotropic. We show that the quantum code increases the fidelity of the states perturbed by quantum errors but that this improvement is not enough to justify the use of quantum codes. Namely, we prove that, taking into account that the time interval between the application of the two corrections is multiplied (at least) by the number of qubits n (due to the coding), the best option is not to use quantum codes, since the fidelity of the uncoded state over a time interval n times smaller is greater than that of the state resulting from the quantum code correction.

关键词： Quantum Error Correcting Codes Isotropic Quantum Computing Errors Quantum Computing Error Fidelity Quantum Computing Error Variance

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