期刊
PHYSICAL REVIEW A
卷 85, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.042316
关键词
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资金
- JSPS, Japan
- Joint Italian-Japanese Laboratory on Quantum Technologies: Information, Communication, and Computation of the Italian Ministry of Foreign Affairs
- Ministry of Education, Culture, Sports, Science, and Technology, Japan [21740294]
- Grants-in-Aid for Scientific Research [22540292, 21740294] Funding Source: KAKEN
A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two root SWAP gates and hinges only on measurements performed on a reference system, prepared in a certain pure state and coupled with the target system. Neither tomographic methods, with the complete reconstruction of the state, nor interferometric setups are needed.
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