Results 11 to 20 of about 84,399 (194)
Connecting processes with indefinite causal order and multi-time quantum states [PDF]
New Journal of Physics, 2017 Recently, the possible existence of quantum processes with indefinite causal order has been extensively discussed, in particular using the formalism of process matrices. Here we give a new perspective on this question, by establishing a direct connection
Ralph Silva +5 more
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Experimental super-Heisenberg quantum metrology with indefinite gate order [PDF]
Nature Physics, 2023 The precision of quantum metrology is widely believed to be restricted by the Heisenberg limit, corresponding to a root mean square error that is inversely proportional to the number of independent processes probed in an experiment, N . In the past, some
P. Yin +13 more
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Device-independent certification of indefinite causal order in the quantum switch [PDF]
Nature Communications, 2022 Quantum theory is compatible with scenarios in which the order of operations is indefinite. Experimental investigations of such scenarios, all of which have been based on a process known as the quantum switch, have provided demonstrations of indefinite ...
Tein van der Lugt +2 more
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Noisy quantum metrology with the assistance of indefinite causal order [PDF]
, 2021 A generic qubit unitary operator affected by depolarizing noise is duplicated and inserted in a quantum switch process realizing a superposition of causal orders. The characterization of the resulting switched quantum channel is worked out for its action
F. Chapeau-Blondeau
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Quantum Refrigeration with Indefinite Causal Order. [PDF]
Physical Review Letters, 2020 We propose a thermodynamic refrigeration cycle which uses indefinite causal orders to achieve nonclassical cooling. The cycle cools a cold reservoir while consuming purity in a control qubit.
David Felce, V. Vedral
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On Randomized Trace Estimates for Indefinite Matrices with an Application to Determinants [PDF]
Foundations of Computational Mathematics, 2020 Randomized trace estimation is a popular and well-studied technique that approximates the trace of a large-scale matrix B by computing the average of xTBx\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts ...
Alice Cortinovis, D. Kressner
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Quantum operations with indefinite time direction [PDF]
Communications Physics, 2020 The fundamental dynamics of quantum particles is neutral with respect to the arrow of time. And yet, our experiments are not: we observe quantum systems evolving from the past to the future, but not the other way round.
G. Chiribella, Zi-Wen Liu
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Indefinite mean-field type linear-quadratic stochastic optimal control problems [PDF]
at - Automatisierungstechnik, 2020 This paper focuses on indefinite stochastic mean-field linear-quadratic (MF-LQ, for short) optimal control problems, which allow the weighting matrices for state and control in the cost functional to be indefinite.
Na Li, Xunjing Li, Zhiyong Yu
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Quantum Metrology with Indefinite Causal Order. [PDF]
Physical Review Letters, 2019 We address the study of quantum metrology enhanced by indefinite causal order, demonstrating a quadratic advantage in the estimation of the product of two average displacements in a continuous variable system.
Xiaobin Zhao +2 more
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Complexity/informativeness trade-off in the domain of indefinite pronouns
Annual Meeting of the Cognitive Science Society, 2021 The vocabulary of human languages has been argued to support efficient communication by optimizing the trade-off between complexity and informativeness (Kemp & Regier 2012).
M. Denic +2 more
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