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DTSTAMP:20260425T051649Z
UID:65b108888963a386344085@ist.ac.at
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DESCRIPTION:Speaker: Harald Schwefel\nhosted by Johannes Fink\nAbstract: Le
 gend has it that the ring of power was forged at Mount Doom  Middle Earth 
 (New Zealand). I will show how we strive to harness the power of light bou
 nd in crystalline ring resonators [1] realising optical frequency combs an
 d connecting future quantum computers to quantum networks. The magic lies 
 in the nonlinear interaction of matter with the light. Strong nonlinear in
 teractions require high optical fields. One of the most successful platfor
 ms for harvesting strong nonlinear interactions with continuous wave pumpi
 ng fields are optical resonators. Large optical fields require long confin
 ement times and small mode volumes. A particular successful system for non
 linear interactions is that of a whispering gallery mode (WGM) resonator. 
 In such a resonator type the light is confined within a dielectric by tota
 l internal reflection at its circular dielectric boundary. The confinement
  by total internal reflection allows modes to exist throughout the transpa
 rency region of the material. This broadband confinement combined with the
  tight guiding of the modes at the rim of the resonator is ideal for nonli
 near interaction between different frequency domains or for resonantly enh
 anced lasing feedback. In this talk I will present our recent results of o
 ptical frequency combs [2] and dual frequency combs [3] and show how this 
 geometry has been used for microwave to optical transduction [46] and prop
 ose a few new design ideas of how to achieve quantum transduction. 1. I. B
 reunig\, "Three-wave mixing in whispering gallery resonators\," Laser Phot
 onics Rev. 10\, 569---587 (2016).2. A. Rueda\, F. Sedlmeir\, M. Kumari\, G
 . Leuchs\, and H. G. L. Schwefel\, "Resonant electro-optic frequency comb\
 ," Nature 568\, 378--381 (2019).3. N. J. Lambert\, L. S. Trainor\, and H. 
 G. L. Schwefel\, "Microresonator-based electro-optic dual frequency comb\,
 " Commun. Phys. 6\, 18 (2023).4. A. Rueda\, F. Sedlmeir\, M. C. Collodo\, 
 U. Vogl\, B. Stiller\, G. Schunk\, D. V. Strekalov\, C. Marquardt\, J. M. 
 Fink\, O. Painter\, G. Leuchs\, and H. G. L. Schwefel\, "Efficient microwa
 ve to optical photon conversion: an electro-optical realization\," Optica 
 3\, 597604 (2016).5. W. Hease\, A. Rueda\, R. Sahu\, M. Wulf\, G. Arnold\,
  H. G. L. Schwefel\, and J. M. Fink\, "Bidirectional Electro-Optic Wavelen
 gth Conversion in the Quantum Ground State\," PRX Quantum 1\, 020315 (2020
 ).6. N. J. Lambert\, A. Rueda\, F. Sedlmeir\, and H. G. L. Schwefel\, "Coh
 erent Conversion Between Microwave and Optical PhotonsAn Overview of Physi
 cal Implementations\," Adv. Quantum Technol. 3\, 1900077 (2020).
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Harald Schwefel: Microwave to optical quantum transduction and opti
 cal frequency combs: Nonlinear optics in ultra-high quality resonators
URL:https://talks-calendar.ista.ac.at/events/5628
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