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DTSTART:20261109T110000Z
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TRANSP:OPAQUE
DTEND:20261109T120000Z
LOCATION:Seminar Room
SUMMARY:ICFO | NUNE BADALYAN
CLASS:PUBLIC
DESCRIPTION:Photonic quantum technologies rely on two complementary capabil
 ities. The first is manipulating single photons with high fidelity in scal
 able integrated circuits. The second is making those photons interact with
  one another\, which requires a material qubit to mediate. In this seminar
  I will present my work on both sides of this problem.\nIn the first part\
 , I will describe the photonic quantum hardware platform of the company Qu
 andela and my work in the photonic integrated circuits team. There I model
 led and designed a broadband integrated beam splitter\, one of the element
 ary building blocks of a photonic quantum processor. I will discuss the pr
 ocessing architecture and the design constraints that matter most for quan
 tum applications: a stable splitting ratio over a wide wavelength range\, 
 low loss\, and robustness to fabrication tolerances.\nIn the second part\,
  I will turn to my work at C2N on semiconductor quantum dot&ndash\;micropi
 llar cavity devices\, which serve as bright single photon sources for phot
 onic processors. Here\, however\, I will look at them from a different per
 spective: as an efficient interface between the spin of a single confined 
 charge and the polarization of a single photon. Because of optical selecti
 on rules\, a photon reflected from the device undergoes a large\, spin-dep
 endent rotation of its polarization. This enables spin&ndash\;photon entan
 glement and\, ultimately\, spin-mediated gates acting on incoming photons\
 , providing the photon&ndash\;photon interaction that linear optics alone 
 cannot offer.\nTogether\, these two projects illustrate how integrated pho
 tonic circuits and spin&ndash\;photon interfaces can be combined in future
  photonic quantum computers and quantum networks.
DTSTAMP:20261101T035349Z
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