Experimental verification of decoherence-free subspaces

P. G. Kwiat, A. J. Berglund, J. B. Altepeter, A. G. White

Research output: Contribution to journalArticlepeer-review


Using spontaneous parametric down-conversion, we produce polarization-entangled states of two photons and characterize them using two-photon tomography to measure the density matrix. A controllable decoherence is imposed on the states by passing the photons through thick, adjustable birefringent element. When the system is subject to collective decoherence, one particular entangled state is seen to be decoherence-free, as predicted by theory. Such decoherence-free systems may have an important role for the future of quantum computation and information processing.

Original languageEnglish (US)
Pages (from-to)498-501
Number of pages4
Issue number5491
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • General


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