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.
Original language | English |
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Article number | 042316 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 85 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2012 Apr 16 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics