期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms6173
关键词
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资金
- Italian National Group of Mathematical Physics (GNFM-INdAM)
- PRIN LLKJBX on 'Collective quantum phenomena: from strongly correlated systems to quantum simulators,'
- JSPS
- Erasmus Mundus-BEAM Program
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Waseda University
- Grants-in-Aid for Scientific Research [22540292, 26400406] Funding Source: KAKEN
The ability of quantum systems to host exponentially complex dynamics has the potential to revolutionize science and technology. Therefore, much effort has been devoted to developing of protocols for computation, communication and metrology, which exploit this scaling, despite formidable technical difficulties. Here we show that the mere frequent observation of a small part of a quantum system can turn its dynamics from a very simple one into an exponentially complex one, capable of universal quantum computation. After discussing examples, we go on to show that this effect is generally to be expected: almost any quantum dynamics becomes universal once 'observed' as outlined above. Conversely, we show that any complex quantum dynamics can be 'purified' into a simpler one in larger dimensions. We conclude by demonstrating that even local noise can lead to an exponentially complex dynamics.
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