Publication Date:
2000-10-20
Description:
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 elements. 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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kwiat, P G -- Berglund, A J -- Altepeter, J B -- White, A G -- New York, N.Y. -- Science. 2000 Oct 20;290(5491):498-501.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. kwiat@lanl.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11039926" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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