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SUMMARY:QSE Junior Quantum Seminar - Tiff Brydges
DTSTART:20250415T093000
DTEND:20250415T110000
DTSTAMP:20260525T020003Z
UID:ab0f597bf964e6d4ddc56d62aa9c7078e7d0a0cf245efea7b7c20a0a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Tiff Brydges\nPlease join us for the Junior Quantum Seminar
  with Tiff Brydges from the Quantum Technologies Group at the Departme
 nt of Applied Physics (University of Geneva) who will give the talk "Int
 egrated Micro-Ring Resonators for Enabling Quantum Networks" on Tuesday A
 pril 15th from 9h30-11h.\n\nPLEASE NOTE: The Junior Quantum Series are for
  gathering  the junior quantum community of master's students\, PhDs a
 nd post-docs at EPFL\, to create a non-judgmental space were scientific id
 eas can be shared between peers. This event is not for Professors or senio
 r researchers. \n\nABSTRACT:\nA key component of quantum communication is
  the distribution of entanglement through networks. However\, this comes w
 ith several challenges. One of the most significant is that direct transmi
 ssion of quantum information between two nodes\, via a standard fibre link
 \, is unfeasible for transmission distances of more than a few hundreds of
  kilometres [1]. A solution is the ‘quantum repeater’ architecture. Th
 is distributes entanglement between two nodes via an intermediate repeater
  station [2]\, forming an elementary repeater link. Current state of the a
 rt experiments have recently implemented proof-of-principle\, repeater-lik
 e networks with quantum memories [3]. However\, such experiments often use
  highly complex photon sources\, which is impractical when moving towards 
 a realistically implementable and scalable quantum network. Integrated pho
 tonics is a promising solution to this problem\, allowing large numbers of
  components to be packaged together in a compact and stable manner [4]. In
 terfacing sources with quantum memories based on atomic systems places str
 ict requirements on the photon source\, including the requirement for gene
 ration of narrow bandwidth photons\, fast-frequency actuation for locking 
 to the memory transition\, and wavelength compatibility\, with many atomic
  transitions being in the visible or NIR regimes. Integrated micro-ring re
 sonators (MRRs) have already shown they are well-suited to the production 
 of narrow-band photons\, with bandwidths compatible with some rare-earth i
 on quantum memories [5\, 6\, 7]\, and the potential for generating photons
  with highly non-degenerate wavelengths [8]. This talk will showcase our r
 ecent work at the University of Geneva in addressing these challenges with
  integrated MRRs\, so moving towards the development of integrated quantum
  nodes for elementary repeater links. Results from fast-frequency control 
 of the integrated photonic MRRs will be presented\, with a resulting locki
 ng bandwidth many times higher than achievable with the thermal locking sc
 hemes used previously [7]. To highlight the narrowband nature of our sourc
 es\, and their suitability for use in quantum networks with quantum memori
 es\, recent entanglement visibility measurements will be presented. In add
 ition\, Hong-Ou-Mandel interference from two independent\, narrow-band MRR
  photon sources will be shown\, with quantum beat signatures [9] being see
 n due to the long photon coherence times.\n\n[1] M. Krenn et al.\, Quantum
  Communication with Photons\, pp. 455–482\, Springer International Publi
 shing (2016)\n[2] N. Sangouard et al.\, Quantum repeaters based on atomic 
 ensembles and linear optics\, Rev. Mod. Phys.\, 83\, pp. 33–80 (2011)\n[
 3] D. Lago-Rivera et al.\, Telecom-heralded entanglement between multimode
  solid-state quantum memories\, Nature\, 594\, pp. 37-40 (2021)\n[4] S. Sl
 ussarenko & G. J. Pryde\, Photonic quantum information processing: A conci
 se review\, Appl. Phys. Rev.\, 6(4)\, 041303 (2019)\n[5] F. Samara et al.\
 , Entanglement swapping between independent and asynchronous integrated ph
 oton-pair sources\, Quantum Sci. Technol.\, 6(4)\, (2021)\n[6] M. Businger
  et al.\, Optical Spin-Wave Storage in a Solid-State Hybridized Electron-N
 uclear Spin Ensemble\, Phys. Rev. Lett.\, 124\, 053606 (2020)\n[7] T. Bryd
 ges et al.\, Integrated photon-pair source with monolithic piezoelectric f
 requency tunability\, Phys. Rev. A\, 107\, 052602 (2023)\n[8] X. Lu et al.
 \, Chip-integrated visible–telecom entangled photon pair source for quan
 tum communication Nat. Phys\, 15\, 373-381 (2019)\n[9] T. Legero et al.\, 
 Quantum Beat of Two Single Photons Phys. Rev. Lett.\, 93\, 070503 (2004)\n
 \nBIO:\nOriginally from the UK\, I did my undergraduate and Masters studi
 es at the University of Oxford\, specialising in the final year on quantum
  computing with integrated photonic platforms. In 2016 I moved to the Univ
 ersity of Innsbruck in Austria to do my PhD under Rainer Blatt\, where I w
 orked on quantum computing with trapped ion platforms. Following this\, in
  2021 I came to the University of Geneva for a postdoc working on quantum 
 networks. Since 2024 I hold an SNSF Ambizione fellowship at the University
  of Geneva\, where I focus on interfacing integrated photonic platforms wi
 th quantum memories for quantum networks.​​​​​​​
LOCATION:CM 0 13 https://plan.epfl.ch/?room==CM%200%2013
STATUS:CONFIRMED
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