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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-sonell-malik
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West QNC 1201 Wate
 rloo ON N2L 3G1 Canada
SUMMARY:IQC Student Seminar featuring Sonell Malik
CLASS:PUBLIC
DESCRIPTION:ALL-OPTIC FINE STRUCTURE SPLITTING ERASER\n\nReliable entangled
  photon sources are important for testing\nfundamentals in quantum mechani
 cs\, achieving secure quantum key\ndistribution\, among other things. Quan
 tum dots are a hot topic for\nprecisely this need of the scientific commun
 ity. Quantum dots act as\nartificial atoms by confining electrons and hole
 s in wells. They emit\npolarization entangled photons in an exciton-biexci
 ton cascade. The\nexpected entangled state from the cascade is    \n 
          \nThe confining potential of these wells can be asymmetr
 ic which causes\nfine structure splitting in the intermediate energy level
  of the\ncascade.\n \nThe presented work offers a way to achieve perfectl
 y entangled photon\npairs with quantum dots in vertical nanowires\, on dem
 and and with a\nhigh count rate. Fine structure splitting is seen in all q
 uantum dot\nsystems whether they are quantum dots in nanowires\, micropill
 ars\, or\,\nself-assembled quantum dots. This proposal is universal becaus
 e it can\nbe used to compensate for energy dependent entanglement degradat
 ion in\nall entangled photon sources.\nThe fine structure splitting in the
  dot leads to a difference in\nenergy of the photons in different polariza
 tions. This renders the\nquantum dot system less effective for quantum key
  distribution\napplications. Therefore\, countering fine structure splitti
 ng is highly\ndesirable.\n\nThis talk will discuss the approach taken in Q
 uantum Photonic Devices\nlab to counter the fine structure splitting.
DTSTAMP:20260407T135544Z
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