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SUMMARY:Probing Photon Indistinguishability with Fast Spectrometers
DTSTART:20261015T121500Z
DTEND:20261015T131500Z
DTSTAMP:20261002T222100Z
UID:indico-event-213@indico.zdv.uni-mainz.de
DESCRIPTION:Speakers: Andrei Nomerotski (Czech Technical University Prague
 )\n\nQuantum technologies critically rely on the ability to detect and ide
 ntify indistinguishable photons\, as only such photons exhibit high-contra
 st quantum interference. We present a new approach to real-time photon ind
 istinguishability detection based on ultrafast spectro-temporal imaging us
 ing pixelated detectors. The concept maps each detected photon onto a well
 -defined time–frequency (t\,ω) mode corresponding to an individual pixe
 l\, which effectively acts as a selector of the quantum state\, enabling d
 irect identification of interfering photon pairs as well as higher-order c
 orrelations.\nThe implemented system combines an optical spectrometer with
  a fast pixelated readout based on a SPAD linear array (LinoSPAD2)\, achie
 ving ~40 ps timing and ~40 pm spectral resolution. We report the first dem
 onstration of massively parallel\, wavelength-resolved photon bunching in 
 two-photon Hanbury Brown–Twiss interference measurements for broadband l
 ight\, simultaneously across ~100 independent spectral channels - an impro
 vement of more than an order of magnitude over previous results [1]. This 
 performance approaches the Heisenberg–Gabor limit for joint time–frequ
 ency measurements\, a regime not accessible with existing detector technol
 ogies. We further present ongoing efforts to enhance spectral resolution u
 sing an echelle spectrometer architecture\, targeting the regime where eac
 h pixel corresponds to a single spectro-temporal mode\, as well as discuss
 ing prospects for extending the concept to fast two-dimensional detector a
 rrays 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 rea
 l-time processing\, drastically reducing data volumes by selecting only re
 levant photon events. Importantly\, the method naturally generalizes beyon
 d two-photon interference to genuine multiphoton correlation measurements\
 , including photon-number-resolved events within single pixels. This techn
 ology opens new opportunities across multiple domains\, including waveleng
 th-multiplexed quantum communication\, long-baseline astronomical interfer
 ometry\, and quantum imaging and sensing with enhanced background rejectio
 n in photon-starved conditions.\n[1] Hanbury Brown-Twiss interference with
  massively parallel spectral multiplexing for broadband light\, S Kulkov e
 t al\, preprint arXiv:2509.05649 (2025).\n\nhttps://indico.zdv.uni-mainz.d
 e/event/213/
LOCATION:Lorentz-Raum (05-127) (Institut für Physik)
URL:https://indico.zdv.uni-mainz.de/event/213/
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