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UID:DSC-12313
DTSTART;TZID=Europe/Berlin:20161219T100000
SEQUENCE:1482133894
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20161219T110000
URL:https://dresden-science-calendar.de/calendar/de/detail/12313
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Zopf: Entangled indistinguishable photon pairs at Rb transitions
CLASS:PUBLIC
DESCRIPTION:Speaker: Michael  Zopf\nInstitute of Speaker: IIN\nTopics:\nMat
 erialien\, Physik\n Location:\n  Name: IFW (B3E.26\, IIN)\n  Street: Helmh
 oltzstraße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDescription: Fu
 ture quantum networks involve the transmission of information between diff
 erent nodes using single photons and entangled photon pairs. To overcome t
 ransmission losses over large distances a so called quantum repeater is es
 sential\, which is the quantum mechanical equivalent to a classical signal
  amplifier. One key component of this technology is the entanglement swapp
 ing scheme [1]. It applies quantum interference between two entangled phot
 on pairs and relies on a high degree of entanglement and indistinguishabil
 ity of the emitted photons.  Semiconductor quantum dots (QDs) are leading 
 candidates for the deterministic emission of single photons and entangled 
 photon pairs. However\, matching the properties of two individual sources 
 remains a challenge. Due to the random growth nature of QDs\, post-growth 
 tuning techniques become inevitable. A novel strain-tuning device\, develo
 ped in our group [2]\, enables the Generation of wavelength-tunable entang
 led photons. It therefore renders entanglement swapping possible\,since di
 fferent entangled photon sources can be wavelength-matched.  In this talk\
 , I will carve out the requirements to the QDs and the optical setup for a
  successful implementation of the entanglement swapping scheme. In this co
 ntext\, the progress in the last year is presented and open tasks highligh
 ted. On-demand emission of entangled photon pairs in aAs/AlGaAs QDs has be
 en achieved by employing a resonant two-photon excitation scheme (Fig.1a) 
 [3]. The obtained entanglement fidelities are among the highest ever repor
 ted for quantum dot systems [4]. The long-term coherence of the QD emissio
 n was quantified using Fourier-transform spectroscopy\, and the photon ind
 istinguishability on short timescales was measured (Fig. 1b). The progress
  on increasing the QD brightness by employing photonic microstructures wil
 l be discussed. Furthermore\, first results of the locking the QD emission
  to Rb vapor will be presented.
DTSTAMP:20260624T115625Z
CREATED:20161217T074205Z
LAST-MODIFIED:20161219T075134Z
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