MULTIPHOTONICS (2024)

The first MULTIPHOTONICS meeting took place in München on 4–5 July (2024) with the support of Elena del Valle's Hans Fischer Fellowship of the IAS at TUM. The second edition is scheduled for 8–9 October (2025) in Madrid.

The first edition was organised by the HF-focused group Novel quantum-light sources composed of Kai Müller, Sang Kyu Kim and Elena del Valle.

Scientific secretaries: Sang Kyu Kim and Eduardo Zubizarreta Casalengua.

Topics

Multiphoton generation: Single and N-photon emission.
Quantum light generation with properties such as entanglement or squeezing.
Frequency filtering, statistics, coherence and correlation measurements.
Quantum optics, cavity-QED, light-matter interaction and nanophotonics.

Invited speakers and participants

1. Ahsan Nazir - University of Manchester
2. Alejandro González Tudela - IFF-CSIC Madrid
3. Andreas Muller - University of South Florida, USA
4. Arno Rauschenbeutel - Humboldt University in Berlin
5. Carlos Antón Solanas - Universidad Autónoma de Madrid
6. Carlos Sánchez Muñoz - IFF-CSIC Madrid
7. Doris Reiter - Technische Universität Dortmund
8. Eduardo Zubizarreta Casalengua - Technische Universität München
9. Fabrice Laussy - ICMM-CSIC Madrid
10. Gerhard Rempe - Max Planck Institute of Quantum Optics, Munich
11. Jake Iles-Smith - University of Manchester
12. Klaus D. Jöns - Paderborn University
13. Klaus Mølmer - Københavns Universitet
14. Serge Reynaud - Laboratoire Kastler Brossel, Paris
15. Zhiliang Yuan - Academy of Quantum Information Sciences, Beijing

PhD speakers:

16. Sana Khalid - University of Wolverhampton
17. Sang Kyu Kim - Technische Universität München
18. Paul Hagen - Bayreuth University
19. Santiago Bermúdez Feijóo - Paderborn University
20. Mateusz Salamon - University of Manchester

Kai Müller's group at Walter Schottky Institut and Technische Universität München:

21. Kai Müller
22. Friedrich Sbresny
23. Carolin Calcagno

Elena del Valle's group at Universidad Autónoma de Madrid:

24. Elena del Valle
25. Miguel Ángel Palomo Marcos

Program

Program in pdf.

Talks are 40 min long: 25 to 30 min presentation + 10 to 15 min questions & discussion.

Wednesday, 3.7.2024

Arrival of participants.
Night 1 at the hotel.

Thursday, 4.7.2024

09:00 - 09:20 Welcome reception (with coffee) & Workshop opening by Elena del Valle.

SESSION 1:

Chairing: Elena del Valle

09:20 - 10:00 — Gerhard Rempe: Efficient generation of high-fidelity multi-photon graph-state entanglement

10:00 - 10:40 — Doris Reiter: Many and few photon SUPER: Theory of inverting a quantum emitter with off-resonant light in the semiclassical and quantum picture

10:40 - 11:20 — Klaus Mølmer: Jaynes-Cummings Interactions Keeping Up With Light That Moves

11:20 - 12:00 — Fabrice Laussy: 10 years of the bundler


12:00 - 13:20 Lunch #1 (1h20)


SESSION 2:

Chairing: Fabrice Laussy

13:20 - 14:00 — Elena del Valle: Multiple and colorful photons

14:00 - 14:40 — Andreas Muller: Second and third order frequency-resolved photon correlations from a semiconductor quantum dot in resonance fluorescence using tunable filters

14:40 - 15:20 — Ahsan Nazir: Photon statistics of spectrally-filtered resonance fluorescence

15:20 - 16:00 — Zhiliang Yuan: Intuitive spontaneous emission model for resonance fluorescence from deep Heitler to high Mollow excitation regime


16:00 - 16:30 Coffee break (30min)


SESSION 3: PhD speakers

Chairing: Kai Müller

PhD talks are 20min long: 15 presentation + 5 questions & discussion

16:30 - 16:50 — Sang Kyu: Experimental attempts to discover hidden photons in resonance fluorescence

16:50 - 17:10 — Paul Hagen: Why phonons increase photon number coherence of a QD-cavity system excited by a resonant laser pulse

17:10 - 17:30 — Santiago Bermúdez Feijóo: Entanglement in the Mollow regime of the photons coming from the satellite peaks driven by an off resonant source

17:30 - 17:50 — Sana Khalid: A perfect single photon source

17:50 - 18:10 — Mateusz Salamon: Understanding phonon effects in filtered resonance fluorescence of quantum dot single-photon sources

18:10 - 18:30 — Miguel Ángel Palomo Marcos: Heralding single photons in detuned resonance fluorescence


18:40 Final round table during dinner.


20:00 Drinks, night 2 at the hotel.

Friday, 5.7.2024

09:15 - 09:20 Welcome back

SESSION 4:

Chairing: Gerhard Rempe

09:20 - 10:00 — Serge Reynaud: The resonance fluorescence cascade of a laser-excited two-level atom

10:00 - 10:40 — Arno Rauschenbeutel: Photon-photon correlations in superradiant bursts of light from cascaded quantum emitters

10:40 - 11:20 — Eduardo Zubizarreta Casalengua: Squeezing and stretching photon statistics (with coherent light)

11:20 - 12:00 — Carlos Antón Solanas: Resonant driving of artificial atoms to generate superposition, time-entanglement and energy-time-entanglement encoded in the photon number basis

12:00 - Workshop group photo

12:15 - 13:20 Lunch #2 (1h20)


SESSION 5:

Chairing: Klaus Mølmer

13:20 - 14:00 — Alejandro González Tudela: Strategies for multi-photon generation based on collective and programmable light-matter interactions

14:00 - 14:40 — Klaus D. Jöns: Optical Coherent Control of Droplet-etched GaAs Quantum Dots and the Reappearance of Rabi Oscillations

14:40 - 15:20 — Carlos Sánchez Muñoz: Strong driving of quantum emitters: routes towards entanglement and multiphoton generation

15:20 - 16:00 — Kai Müller: Dynamics of Single-photon and multi-photon generation from semiconductor quantum dots

16:00 - 16:30 Final discussions with coffee & Workshop closing by Kai Müller.

16:30 Participants leave

Venue

We will be meeting at the ground floor of the IAS building (auditorium).

Address:

Institute for Advanced Study
Lichtenbergstraße 2 a
85748 Garching
location

Hotel

All participants have a room booked with breakfast for both nights at the Hotel Hoyacker Hof.

Freisinger Landstraße 9a
85748 Garching
Tel: 089/3269900
Fax: 089/3207243
e-mail: info@hoyackerhof.de
web

Gallery

• 
  The organizing committee.
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  Bags, program & badges.
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  While waiting for the other attendants.
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  Opening
• 
  by Elena del Valle.
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  Opening talk by Gerhard Rempe.
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  Entanglement zoo.
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  Super Doris Reiter.
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  Klaus Mølmer.
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  The audience.
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  Questions.
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  Response.
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  Fabrice Laussy down the Rabbit hole.
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  Anecdotes from the time of the bundler's prehistory.
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  Elena del Valle on multiple and colourful photons.
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  Andreas Muller on his pioneering measurements of two-photon spectra from resonance fluorescence
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  and other breakthroughs in the time domain and at the three-photon level.
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  Ahsan Nazir on correlations of frequency-filtered resonance fluorescence.
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  Rauschenbeutel, Muller and Reynaud.
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  Eduardo Zubizarreta asking on the polaron transformation.
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  Zhiliang Yuan on an intuitive picture of spontaneous two-photon emission in resonance fluorescence.
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  All resonance fluorescence photons are equal.
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  Carlos Anton Solanas reacting from the audience.
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  Reactions from the other side of the room.
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  Coffee break.
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  Sang Kyu Kim on his experimental attempts to uncover photons hidden in resonance fluorescence.
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  Found (some of) them.
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  Homodyning to the rescue.
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  Zhiliang Yuan, Klaus Mølmer, Alejandro Gonzalez Tudela, Carolin Calcagno, Friedrich Sbresny and Paul Hagen.
• 
  Arno Rauschenbeutel speaking.
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  Klaus Jons speaking.
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  Paul Hagen on phonons effects on photon coherence.
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  Santiago Bermúdez Feijóo
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  on photon entanglement from the Mollow triplet.
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  Frequency-resolved Monte Carlo.
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  Sana Khalid on perfect single-photon sources.
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  Mateusz Salamon
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  upgrading the sensor method to solid-state platforms.
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  Miguel-Angel Palomo Marcos
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  on homodyning resonance fluorescence
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  and incoherent photon cascades
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  related to Wigner crystals.
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  End of the 1st day, at the Biergarten.
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  Gerhard Rempe opening the 2nd day.
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  Serge Reynaud discussing order within randomness.
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  Comments on bunching in cross correlations.
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  Whether sub-Poissonian statistics survive large time bins (it doesn't).
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  Arno Rauschenbeutel
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  on photon bursts in chiral waveguides.
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  The audience.
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  Questions on waveguiding from waveguide expert.
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  Kai Müller on detuned photon blockade
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  and the fight between $n$ and $\sqrt{n}$.
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  About the so-called dynamical Mollow triplet.
• 
  Klaus Jons.
• 
  Klaus Jons.
• 
  Klaus Jons.
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  Carlos Anton Solanas on photon entanglement in the photon-number basis.
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  Carlos Anton Solanas.
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  With Ilise Maillette and Mach-Zehnder.
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  Carlos Anton Solanas.
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  Jake Iles-Smith speaking.
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  Alejandro Gonzalez Tudela.
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  Cat and NOON states in cavities.
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  Klaus Mølmer offering an argument.
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  Receiving its feedback.
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  Klaus Jons now on stage.
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  Jons and Muller.
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  Doris Reiter.
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  Friedrich Sbresny.
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  Friedrich Sbresny.
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  Carlos Sánchez Muñoz
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  on multiphoton generation.
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  "doing great".
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  Salamon, Jons and Calcagno.
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  The chair opiniating.
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  Last talk of the workshop: Eduardo Zubizarreta Casalengua
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  on stretching and squeezing photon statistics.
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  Sub-natural linewidth or antibunched?
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  Mølmer & Zubizarreta.
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  "Goodbye blue sky".
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  The logo of the workshop finally explained.
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  Last questions: "aren't oscillations of unconventional blockade in $g^{(2)}$ a problem?" (there are no oscillations).
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  Last questions: "what are the differences between the squeezed cavity and resonance fluorescence" (non-Gaussian features).

See you for MULTIPHOTONICS (2025).