A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Measurement scheme for purity based on two two-body gates
2012
Physical Review A. Atomic, Molecular, and Optical Physics
Preserved Fulltext
Other Versions
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.
doi:10.1103/physreva.85.042316
fatcat:ke6qjt2l2vdx5gzvwyd45docxa