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 |
|---|---|
| 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
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Cite this
Nakazato, H., Tanaka, T., Yuasa, K., Florio, G., & Pascazio, S. (2012). Measurement scheme for purity based on two two-body gates. Physical Review A - Atomic, Molecular, and Optical Physics, 85(4), [042316]. https://doi.org/10.1103/PhysRevA.85.042316