Hiromichi Nakazato, Toru Tanaka, Kazuya Yuasa, Giuseppe Florio, Saverio Pascazio
A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two square root of SWAP gates and only hinges 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 is needed.
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http://arxiv.org/abs/1201.2736
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