A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two √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. © 2012 American Physical Society.
Measurement scheme for purity based on two two-body gates / Nakazato, H; Tanaka, T.; Yuasa, K.; Florio, Giuseppe; Pascazio, S.. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 85:4(2012). [10.1103/PhysRevA.85.042316]
Measurement scheme for purity based on two two-body gates
FLORIO, Giuseppe;
2012-01-01
Abstract
A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two √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. © 2012 American Physical Society.File in questo prodotto:
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