The theory underpinning the measurement of density matrices of a pair of quantum two-level systems was described with particular emphasis on qubits realized by the two polarization degrees of freedom of a pair of entangled photons generated in a down-conversion experiment. Two techniques of measurement were discussed, namely a maximum likelihood technique and a tomographic reconstruction technique. Error analysis was presented to estimate errors in quantities derived from the density matrix.
|Original language||English (US)|
|Number of pages||4708095|
|Journal||Physical Review A. Atomic, Molecular, and Optical Physics|
|State||Published - Nov 1 2001|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics