期刊
NPJ QUANTUM INFORMATION
卷 6, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41534-020-0250-z
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资金
- National Nature Science Foundation of China (NSFC) [11574291, 11774334]
- National Key RD Program [2016YFA0301700]
- Anhui Initiative in Quantum Information Technologies
- ERC Synergy Grant BioQ [319130]
- BMBF project Q.Link.X
- Quantum Optical Technologies project within the International Research Agendas program of the Foundation for Polish Science
- European Union under the European Regional Development Fund
- European Research Council (ERC) [319130] Funding Source: European Research Council (ERC)
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.
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