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Condensed Matter Physics Seminar


Time-bin entangled pairs from semiconductor quantum dots

Prof. Gregor Weihs
University of Waterloo / Institute for Quantum Computing

Time
 
Thu. November 29, 2007     10:30 AM     STI 501

Abstract
 
Quantum communication and optical quantum computing require sources that can provide special, non-classical states of light. The most important ones are single-photon sources and sources of entangled pairs. While pair sources based on spontaneous parametric down-conversion can provide heralded single photons and high-quality entangled pairs their output cannot be limited to one pair at a time. Individual self-assembled quantum dots have proven to be excellent sources of single photons. However, obtaining polarization entangled pairs has proved to be difficult because of the exciton fine-structure. A different degree of freedom, the emission time may be a better choice to prepare the entanglement in. I will introduce the requirements that need to be met for this entanglement and present our quantum characterization measurements to this end.

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