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UID:DSC-12601
DTSTART;TZID=Europe/Berlin:20170303T100000
SEQUENCE:1488528016
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170303T110000
URL:https://dresden-science-calendar.de/calendar/en/detail/12601
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Keil: Solid-state ensemble of highly entangled photon sources at ru
 bidium transitions
CLASS:PUBLIC
DESCRIPTION:Speaker: Robert Keil\nInstitute of Speaker: IFW Dresden\, Insti
 tut für Integrative Nanowissenschaften\nTopics:\nMaterialien\n Location:\
 n  Name: IFW (D2E.27\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City
 : 01069 Dresden\n  Phone: \n  Fax: \nDescription: Future quantum communica
 tion networks involve the transmission of information between separate nod
 es using single photons [1]. These flying qubits suffer from losses due to
  absorption and decoherence in optical fibers\, demanding the development 
 of new concepts of transmitting quantum states efficiently o. In 1993\, Be
 nnett et al. [2] proposed a scheme utilizing entangled photon pairs to tel
 eport quantum information from one place to another - without the photon b
 eing actually transported. This idea can be expanded to a quantum repeater
 \, rendering long range communication possible. Entanglement swapping\, a 
 core mechanism of the repeater\, was first demonstrated by J.W. Pan et al.
  [3]\, utilizing polarization entangled photon pairs created by spontaneou
 s parametric down-conversion. This process is characterized by Poissonian 
 statistics\, i.e. a tradeoff has to be made between source brightness and 
 multi-photon emission probability\, limiting its practicality for scalable
  networks significantly. Since then\, many efforts have been taken to real
 ize a deterministic\, solid-state embedded source of entangled photon pair
 s. The emission of the cascaded decay of the bi-exciton state in single se
 miconductor quantum dots has been demonstrated to generate polarization en
 tangled photon pairs provided a highly symmetric confinement potential [4]
 . Despite various investigated structures and material systems [5\,6\,7\,8
 ]\, many challenges remain unsolved\, such as low yield\, insufficient deg
 ree of entanglement and limited wavelength control. In this talk I will pr
 esent a new generation of GaAs/AlGaAs QDs grown by droplet etching and nan
 o-hole infilling\, obtaining a large ensemble (almost 100%) of polarizatio
 n-entangled photon emitters with record high degree of entanglement (fidel
 ity up to F = 0.91) and unprecedented wavelength control. Therefore this m
 aterial system is an attractive candidate for the realization of a solid-s
 tate quantum emitter. In the second part of my talk additional procedures 
 for an optimized growth and a Schottky-diode sample design are presented t
 owards further improvement of the optical properties of these promising qu
 antum emitters.
DTSTAMP:20260419T182309Z
CREATED:20170303T080016Z
LAST-MODIFIED:20170303T080016Z
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