Measurement of qubits

Daniel F.V. James, Paul G Kwiat, William J. Munro, Andrew G. White

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Article number052312
Pages (from-to)523121-5231215
Number of pages4708095
JournalPhysical Review A. Atomic, Molecular, and Optical Physics
Issue number5
StatePublished - Nov 1 2001

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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