ORCID Profile
0000-0002-8164-9527
Current Organisations
Centre for Engineered Quantum Systems
,
Friedrich-Alexander-Universität Erlangen-Nürnberg
,
Max Planck Institute for the Science of Light
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Publisher: IOP Publishing
Date: 18-03-2013
Publisher: Springer Science and Business Media LLC
Date: 25-04-2013
Publisher: Springer Science and Business Media LLC
Date: 24-05-2013
Publisher: Springer Science and Business Media LLC
Date: 28-09-2013
Publisher: IOP Publishing
Date: 30-04-2015
Publisher: American Physical Society (APS)
Date: 06-11-2017
Publisher: Springer Science and Business Media LLC
Date: 27-08-2019
DOI: 10.1038/S41524-019-0224-X
Abstract: Topologically ordered materials may serve as a platform for new quantum technologies, such as fault-tolerant quantum computers. To fulfil this promise, efficient and general methods are needed to discover and classify new topological phases of matter. We demonstrate that deep neural networks augmented with external memory can use the density profiles formed in quantum walks to efficiently identify properties of a topological phase as well as phase transitions. On a trial topological ordered model, our method’s accuracy of topological phase identification reaches 97.4%, and is shown to be robust to noise on the data. Furthermore, we demonstrate that our trained DNN is able to identify topological phases of a perturbed model, and predict the corresponding shift of topological phase transitions without learning any information about the perturbations in advance. These results demonstrate that our approach is generally applicable and may be used to identify a variety of quantum topological materials.
Publisher: Springer Science and Business Media LLC
Date: 08-01-2014
Publisher: Springer Science and Business Media LLC
Date: 07-12-2012
Publisher: IOP Publishing
Date: 14-09-2016
Publisher: Springer Science and Business Media LLC
Date: 14-03-2015
Publisher: Springer Science and Business Media LLC
Date: 12-01-2013
Publisher: Springer Science and Business Media LLC
Date: 07-03-2013
Publisher: Springer Science and Business Media LLC
Date: 21-01-2015
Publisher: American Physical Society (APS)
Date: 25-09-2023
Publisher: IOP Publishing
Date: 08-2021
Abstract: Discord, originally notable as a signature of bipartite quantum correlation, in fact can be nonzero classically, i.e. arising from noisy measurements by one of the two parties. Here we redefine classical discord to quantify channel distortion, in contrast to the previous restriction of classical discord to a state, and we then show a monotonic relationship between classical (channel) discord and channel distortion. We show that classical discord is equivalent to (doubly stochastic) channel distortion by numerically discovering a monotonic relation between discord and total-variation distance for a bipartite protocol with one party having a noiseless channel and the other party having a noisy channel. Our numerical method includes randomly generating doubly stochastic matrices for noisy channels and averaging over a uniform measure of input messages. Connecting discord with distortion establishes discord as a signature of classical, not quantum, channel distortion.
Publisher: American Physical Society (APS)
Date: 18-12-2018
Publisher: Springer Science and Business Media LLC
Date: 09-06-2013
Publisher: American Physical Society (APS)
Date: 30-05-2017
Publisher: Springer Science and Business Media LLC
Date: 17-04-2014
Publisher: IOP Publishing
Date: 15-05-2018
Publisher: Springer Science and Business Media LLC
Date: 11-11-2012
Publisher: American Physical Society (APS)
Date: 17-02-2022
Publisher: Springer Science and Business Media LLC
Date: 21-06-2017
DOI: 10.1038/S41598-017-03885-5
Abstract: Quantum coherence plays a major role in the promotion for quantum information processing and designing quantum technology. Since coherence is rooted in superposition principle, it is vital to understand the coherence change with respect to superpositions. Here we study the bounds for coherence of quantum superpositions in high dimension. We consider three most frequently used measures of coherence, i.e. the relative entropy of coherence, l 1 norm of coherence and robustness of coherence. For a quantum state (an arbitrary dimension) and its arbitrary decomposition, we give the upper and lower bounds for coherence of the superposition state in terms of the coherence of the states being superposed.
Publisher: Springer Science and Business Media LLC
Date: 07-08-2019
Publisher: Springer Science and Business Media LLC
Date: 05-01-2013
Publisher: Springer Science and Business Media LLC
Date: 24-06-2013
Start Date: 2022
End Date: 2024
Funder: National Natural Science Foundation of China
View Funded Activity