Abstract

The resource theory of coherence studies the operational value of superpositions in quantum technologies. A key question in this theory concerns the efficiency of manipulation and interconversion of the resource. Here, we solve this question completely for qubit states by determining the optimal probabilities for mixed-state conversions via stochastic incoherent operations. Extending the discussion to distributed scenarios, we introduce and address the task of assisted incoherent state conversion, where the process is enhanced by making use of correlations with a second party. Building on these results, we demonstrate experimentally that the optimal state-conversion probabilities can be achieved in a linear optics setup. This paves the way towards real world applications of coherence transformations in current quantum technologies.

Details

Title
Quantum coherence and state conversion: theory and experiment
Author
Kang-Da, Wu 1 ; Theurer, Thomas 2 ; Guo-Yong, Xiang 1 ; Chuan-Feng, Li 1 ; Guo Guang-Can 1 ; Plenio, Martin B 2 ; Streltsov, Alexander 3 

 University of Science and Technology of China, CAS Key Laboratory of Quantum Information, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639); University of Science and Technology of China, CAS Center For Excellence in Quantum Information and Quantum Physics, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639) 
 Universität Ulm, Institute of Theoretical Physics, Ulm, Germany (GRID:grid.6582.9) (ISNI:0000 0004 1936 9748) 
 University of Warsaw, Centre for Quantum Optical Technologies, Centre of New Technologies, Warsaw, Poland (GRID:grid.12847.38) (ISNI:0000 0004 1937 1290) 
Publication year
2020
Publication date
2020
Publisher
Nature Publishing Group
e-ISSN
20566387
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2488776290
Copyright
© The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.