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SUMMARY:Probing Photon Indistinguishability with Fast Spectrometers
DTSTART:20261008T120000Z
DTEND:20261008T140000Z
DTSTAMP:20260920T010800Z
UID:indico-event-40519@indico.in2p3.fr
DESCRIPTION:Speakers: Andrei Nomerotski (Czech Technical University in Pra
 gue)\n\nQuantum technologies critically rely on the ability to detect and 
 identify indistinguishable photons\, as only such photons exhibit high-con
 trast quantum interference. We present a new approach to real-time photon 
 indistinguishability detection based on ultrafast spectro-temporal imaging
  using pixelated detectors. The concept maps each detected photon onto a w
 ell-defined time–frequency (t\,ω) mode corresponding to an individual p
 ixel\, which effectively acts as a selector of the quantum state\, enablin
 g direct identification of interfering photon pairs as well as higher-orde
 r correlations.\nThe implemented system combines an optical spectrometer w
 ith a fast pixelated readout based on a SPAD linear array (LinoSPAD2)\, ac
 hieving ~40 ps timing and ~40 pm spectral resolution. We report the first 
 demonstration of massively parallel\, wavelength-resolved photon bunching 
 in two-photon Hanbury Brown–Twiss interference measurements for broadban
 d light\, simultaneously across ~100 independent spectral channels - an im
 provement of more than an order of magnitude over previous results [1]. Th
 is performance approaches the Heisenberg–Gabor limit for joint time–fr
 equency measurements\, a regime not accessible with existing detector tech
 nologies. We further present ongoing efforts to enhance spectral resolutio
 n using an echelle spectrometer architecture\, targeting the regime where 
 each pixel corresponds to a single spectro-temporal mode\, as well as disc
 ussing prospects for extending the concept to fast two-dimensional detecto
 r arrays at Heisenberg–Gabor limit\, targeting timing resolutions of ~20
  ps and spectral resolutions of ~5 pm.\nA key feature of this approach is 
 the ability to perform indistinguishability analysis and extend it toward 
 real-time processing\, drastically reducing data volumes by selecting only
  relevant photon events. Importantly\, the method naturally generalizes be
 yond two-photon interference to genuine multiphoton correlation measuremen
 ts\, including photon-number-resolved events within single pixels. This te
 chnology opens new opportunities across multiple domains\, including wavel
 ength-multiplexed quantum communication\, long-baseline astronomical inter
 ferometry\, and quantum imaging and sensing with enhanced background rejec
 tion in photon-starved conditions.\n[1] Hanbury Brown-Twiss interference w
 ith massively parallel spectral multiplexing for broadband light\, S Kulko
 v et al\, preprint arXiv:2509.05649 (2025).\n\nhttps://indico.in2p3.fr/eve
 nt/40519/
LOCATION:Amphi Grunewald (Bat 25)
URL:https://indico.in2p3.fr/event/40519/
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