View source for MULTIPHOTONICS (2025)

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The second '''''[[MULTIPHOTONICS]]''''' meeting will take place in [[Madrid]], on {{thesedays|8|9|October|2025}} with the support of [[ICMM]]—[[CSIC]] and [[IFF]]—[[CSIC]]. It follows the very successful [[MULTIPHOTONICS (2024)]] first edition. The workshop will likewise discuss the physics of multiphoton correlations.

If you liked Munich, you'll love Madrid!

== Topics ==
<poem>
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.
</poem>

== Venue ==

[[ICMM]]-[[CSIC]] on the [[Cantoblanco Campus]]:

{{#display_map:
40.54371620681268, -3.6895857339526277~Multiphotonics 2025;
40.601729668839276, -3.7140155088021896~Hotel;
40.41540847521611, -3.7073765955284195~Plaza Mayor de Madrid;
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== Hotel accommodation ==

External attendants will be provided with a two-nights (Tue&nbsp;7 & Wed&nbsp;9) hotel room with breakfast at the [https://www.trescantos-hotel.com/ VP Jardín De Tres Cantos] in [[Tres Cantos]]. This is a quiet, modern urban-planning city at the north of [[Madrid]], well connected to the site of the meeting and to the Spanish capital itself.

== Organizers ==

The event is supported by a joint [[ICMM]]‒[[IFF]] effort:
* [[Fabrice Laussy]] from [[ICMM]]‒[[CSIC]].
* [[Carlos Sánchez Muñoz]] from [[IFF]]‒[[CSIC]].
[mailto:fabrice.laussy@gmail.com,carlossmwolff@gmail.com?subject=MULTIPHOTONICS%20(2025)%21 Contact the organizers].

== Confirmed Attendants ==

# [[Serge Reynaud]]<wz tip="Prof. Reynaud will also give an INC Colloquium on Friday 10 on the topic of Casimir forces."><sup>*</sup></wz> - [[Laboratoire Kastler Brossel]], [[Paris]]
# [[Sven Höfling]] - [[University of Würzburg]], [[Würzburg]]
# [[Jesper Mørk]] - [[Technical University of Denmark]], [[Copenhagen]]
# [[Zhiliang Yuan]] - [[Academy of Quantum Information Sciences]], [[Beijing]]
# [[Kai Müller]] - [[Technische Universität München]], [[München]]
# [[Tim Thomay]] - [[University at Buffalo]], [[New York]]
# [[Ahsan Nazir]] - [[University of Manchester]], [[Manchester]]
# [[Jake Iles-Smith]] - [[University of Sheffield]], [[Sheffield]]
# [[Philipp Schneeweiß]] - [[Humboldt-Universität zu Berlin]], [[Berlin]]
# [[Vincenzo D'Ambrosio]] - [[Università di Napoli Federico II]], [[Napoli]]
# [[Vladislav Shishkov|Владислав Шишков (Vladislav Shishkov)]] - [[Aalto University]], [[Espoo]] 
# [[Yajun Wang]] - [[Shanxi University]], [[China]]
# [[Alexandros Spiliotis]] - [[IESL-FORTH]], [[Heraklion]]
# [[Natalia Armaou]] - [[Westlake University]], [[China]]
# [[Juan Camilo López Carreño]] - [[University of Warsaw]], [[Warsaw]]
# [[Carlos Antón Solanas]] - {{uam}}
# [[Johannes Feist]] - {{uam}}
# [[Antonio Isaac Fernandez Dominguez]] - {{uam}}
# [[Alejandro González Tudela]] - [[IFF]]-[[CSIC]], [[Madrid]]
# [[Francesca Marchetti]] - {{uam}}
# [[Eduardo Zubizarreta Casalengua]] - [[Technische Universität München]], [[München]]
# [[Sang Kyu Kim]] - [[Technische Universität München]], [[München]]
# [[Joaquin Guimbao Gaspar]] - [[ICMM]]-[[CSIC]], [[Madrid]]
# [[Jacob Ngaha]] - [[ICMM]]-[[CSIC]], [[Madrid]]
# [[Lukas Hanschke]] - [[Technische Universität München]], [[München]]
# [[Elena del Valle]] - {{uam}}
# [[Carlos Sánchez]] - [[IFF]]-[[CSIC]], [[Madrid]]
# [[Fabrice Laussy]] - [[ICMM]]-[[CSIC]], [[Madrid]]

== Tentative Program ==

=== Tuesday 7 October ===

Participants arrive.

=== Wednesday 8 October (Day 1) ===

==== Morning Session <!-- Fabrice-->====

===== Opening (by Fabrice Laussy) =====
8:50-9:00

===== Serge Reynaud =====
9:00-9:30

===== Kai Müller =====
''Unlocking multiphoton emission from a single-photon source through mean-field engineering'' — 9:30-10:00

:Multiphotons are generally regarded as accidental in the context of single photon sources. However, multiphoton emission can turn out to be even more fundamental and interesting than the single-photon emission, since in a coherently driven system, the multiphoton suppression arises from quantum interferences between virtual multiphoton fluctuations and the mean field in a Poisson superposition of all number states. Here, we demonstrate how one can control the multiphoton dynamics of a two-level system by disrupting these quantum interferences through a precise and independent homodyne control of the mean field. We show that, counterintuitively, quantum fluctuations always play a major qualitative role, even and in fact especially, when their quantitative contribution is vanishing as compared to that of the mean field.<ref><u>Unlocking multiphoton emission from a single-photon source through mean-field engineering</u>., [[Sang Kyu Kim]]{{etal}} {{arXiv|2411.10441}} (2024).</ref>

===== Joaquin Guimbao Gaspar =====
10:00-10:30

===== Juan Camilo López Carreño =====
10:30-11:00

'''''Coffee break'''''
==== Post-coffee <!-- Sven-->====

===== Jesper Mørk  =====
''Quantum noise and squeezing in nanolasers.'' — 11:30-12:00
:We present a recently developed method for simulating quantum noise in nanolasers.{{cite|bundgaardnielsen23a}}{{cite|bundgaardnielsen25a}} Based on a simple stochastic interpretation of rate equations, the approach accurately reproduces quantum master equation results for few-emitter lasers and aligns with Langevin equations in macroscopic regimes. Notably, it bridges the intermediate mesoscopic regime previously inaccessible to existing models. We apply this method to analyze amplitude squeezing in nanolasers using novel cavities with extreme light confinement, which strongly enhance light-matter interaction.

===== Elena del Valle =====
12:00-12:30

===== Ahsan Nazir  =====
12:30-13:00

===== Владислав Шишков =====
''Spectral theory and statistical properties of integrated single-photon sources.'' — 13:00-13:30

'''''Lunch'''''

''Group photo''

==== Afternoon Session <!-- Carlos AS-->====
===== Philipp Schneeweiß =====
''Tailoring photon statistics with an atom-based two-photon interferometer'' — 15:00-15:30

Based on Ref.&nbsp;{{onlinecite|cordier23a}}.

===== Johannes Feist =====
15:30-16:00

===== Lukas Hanschke =====
16:00-16:30

===== Francesca Marchetti =====
16:30-17:00

'''''Coffee break'''''

==== Evening Session <!-- Kai/Eduardo-->====
===== Jake Iles-Smith =====
17:30-18:00

===== Antonio Isaac Fernandez Dominguez =====
18:00-18:30

===== Yajun Wang =====
18:30-19:00

===== Carlos Sánchez =====
19:00-19:30

20:30 ''''' Dinner '''''

=== Thursday 9 October (Day 2) ===

==== Morning Session <!-- Jesper-->====

===== Sven Höfling =====
9:00-9:30

===== Tim Thomay =====

''Higher-order Fock states for sensing applications.'' — 9:30-10:00

See Ref.&nbsp;{{onlinecite|powers25a}}.

===== Jacob Ngaha =====
10:00-10:30

===== Eduardo Zubizarreta Casalengua =====
10:30-11:00

'''''Coffee break'''''
==== Post-Coffee Session <!-- Elena-->====

===== Zhiliang Yuan =====
11:30-12:00

===== Carlos Antón Solanas =====
12:00-12:30

===== Sang Kyu Kim =====
12:30-13:00

===== Alejandro González Tudela =====
13:00-13:30

'''''Lunch'''''

==== Afternoon Session <!-- Carlos SM-->====

===== Vincenzo D'Ambrosio =====
14:30-15:00

===== Alexandros Spilioti =====
15:00-15:30

===== Natalia Armaou =====
15:30-16:00

===== Fabrice Laussy =====
''Liquid time and time liquids'' — 16:00-16:30

:The basic quantum-optical emitter—the two-level system—is already much more complicated than one could reasonably expect, and to this day, its thorough characterization remains to be completed.{{cite|zubizarretacasalengua24b}} Here, I will jump to the case of the $N$-level system, and survey the amazing phenomenology that immediately shouts out from this simplest extension of the brick of quantum optics. A first surprise is that the $N$-level system, not the two-level one, is the most suitable to implement perfect single-photon sources.{{cite|khalid24a}} Furthemore, a good single-photon source acquires features that differ considerably from those usually wanted for that purpose. For instance, instead of merely suppressing two-photon coincidences at&nbsp;$\tau=0$, a good single-photon emitter is one that develops long-time oscillations as a result of self-organizing its photon streams to all orders in photon counting, differing from the basic case in a way similar to how a liquid differs from a gas.{{cite|zubizarretacasalengua24a}} This calls for revisiting our understanding of single-photon sources, and raise fascinating questions on how they relate, in time, to exotic phase of matters.{{cite|wilczek19a}} I will also describe how such a picture extends into multiphotonics,{{cite|palomo25a}} and how one could observe such effects experimentally.{{cite|barretopadron25a}}

==== Closing (by Carlos Sánchez) ====

'''''Goodbye coffee & Merienda'''''

Participants depart

== Q&A(bstracts) ==

At this occasion, we shall try to revive an old format of archiving Scientific debates: instead of publishing proceedings, we will publish the abstract and the (edited) [[Q&A(bstracts)|Questions & Answers sessions]], which contains information nowhere else to be found.

== References ==
<references />