科研之友
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摘要
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.
- 出版日期2012-4-16
