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{{#display_map: | {{#display_map: | ||
40.54371620681268, -3.6895857339526277~Multiphotonics 2025; | 40.54371620681268, -3.6895857339526277~Multiphotonics 2025; | ||
40.54561615096305, -3.692864323401343~El Goloso (Tuesday 8th lunch); | |||
40.601729668839276, -3.7140155088021896~Hotel; | 40.601729668839276, -3.7140155088021896~Hotel; | ||
40.54431211734461, -3.690215413275033~Cafeteria (Wednesday 9th lunch); | |||
40.41540847521611, -3.7073765955284195~Plaza Mayor de Madrid; | 40.41540847521611, -3.7073765955284195~Plaza Mayor de Madrid; | ||
}} | }} | ||
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# [[Vincenzo D'Ambrosio]] - [[Università di Napoli Federico II]], [[Napoli]] | # [[Vincenzo D'Ambrosio]] - [[Università di Napoli Federico II]], [[Napoli]] | ||
# [[Vladislav Shishkov|Владислав Шишков (Vladislav Shishkov)]] - [[Aalto University]], [[Espoo]] | # [[Vladislav Shishkov|Владислав Шишков (Vladislav Shishkov)]] - [[Aalto University]], [[Espoo]] | ||
# [[Juan Camilo López Carreño]] - [[University of Warsaw]], [[Warsaw]] | |||
# [[Yajun Wang]] - [[Shanxi University]], [[China]] | # [[Yajun Wang]] - [[Shanxi University]], [[China]] | ||
# [[Alexandros Spiliotis]] - [[IESL-FORTH]], [[Heraklion]] | # [[Alexandros Spiliotis]] - [[IESL-FORTH]], [[Heraklion]] | ||
# [[Natalia Armaou]] - [[Westlake University]], [[China]] | # [[Natalia Armaou]] - [[Westlake University]], [[China]] | ||
# [[ | # [[Moritz Meinecke]] - [[University of Würzburg]], [[Würzburg]] | ||
# [[Carlos Antón Solanas]] - {{uam}} | # [[Carlos Antón Solanas]] - {{uam}} | ||
# [[Johannes Feist]] - {{uam}} | # [[Johannes Feist]] - {{uam}} | ||
# [[Antonio Isaac Fernandez Dominguez]] - {{uam}} | # [[Antonio Isaac Fernandez Dominguez]] - {{uam}} | ||
# [[Alejandro González Tudela]] - [[IFF]]-[[CSIC]], [[Madrid]] | # [[Alejandro González Tudela]] - [[IFF]]-[[CSIC]], [[Madrid]] | ||
# [[Eduardo Zubizarreta Casalengua]] - [[Technische Universität München]], [[München]] | # [[Eduardo Zubizarreta Casalengua]] - [[Technische Universität München]], [[München]] | ||
# [[Sang Kyu Kim]] - [[Technische Universität München]], [[München]] | # [[Sang Kyu Kim]] - [[Technische Universität München]], [[München]] | ||
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''Spectral theory and statistical properties of integrated single-photon sources.'' — 13:00-13:30 | ''Spectral theory and statistical properties of integrated single-photon sources.'' — 13:00-13:30 | ||
'''''Lunch''''' | '''''Lunch''''' at | ||
[https://www.tripadvisor.es/Restaurant_Review-g187514-d25887213-Reviews-El_Goloso_Campus-Madrid.html El Goloso] — 13:30-15:00 | |||
''Group photo'' | ''Group photo'' | ||
| Line 133: | Line 136: | ||
16:00-16:30 | 16:00-16:30 | ||
===== | ===== Jacob Ngaha ===== | ||
16:30-17:00 | 16:30-17:00 | ||
| Line 159: | Line 162: | ||
===== Sven Höfling ===== | ===== Sven Höfling ===== | ||
9:00-9:30 | 9:00-9:30 | ||
===== Moritz Meinecke{{phdcandidate}} ===== | |||
9:30-9:50 | |||
===== Tim Thomay ===== | ===== Tim Thomay ===== | ||
''Higher-order Fock states for sensing applications.'' — 9: | ''Higher-order Fock states for sensing applications.'' — 9:50-10:20 | ||
See Ref. {{onlinecite|powers25a}}. | See Ref. {{onlinecite|powers25a}}. | ||
===== Eduardo Zubizarreta Casalengua ===== | ===== Eduardo Zubizarreta Casalengua ===== | ||
10: | 10:20-10:50 | ||
'''''Coffee break''''' | '''''Coffee break''''' | ||
| Line 176: | Line 179: | ||
===== Zhiliang Yuan ===== | ===== Zhiliang Yuan ===== | ||
11: | 11:15-11:45 | ||
===== Carlos Antón Solanas ===== | ===== Carlos Antón Solanas ===== | ||
11:45-12:15 | |||
===== Sang Kyu Kim ===== | ===== Sang Kyu Kim {{phdcandidate}} ===== | ||
12: | 12:15-12:35 | ||
===== Alejandro González Tudela ===== | ===== Alejandro González Tudela ===== | ||
12:35-13:05 | |||
'''''Lunch''''' | '''''Lunch''''' | ||
| Line 192: | Line 195: | ||
===== Vincenzo D'Ambrosio ===== | ===== Vincenzo D'Ambrosio ===== | ||
14: | ''Tailoring spatial correlations with structured light'' — 14:00-14:30 | ||
===== Alexandros Spilioti ===== | ===== Alexandros Spilioti ===== | ||
14:30-15:00 | |||
===== Natalia Armaou ===== | ===== Natalia Armaou{{phdcandidate}} ===== | ||
15: | ''Spatial correlations of opposite OAM states of light'' — 15:00-15:20 | ||
===== Fabrice Laussy ===== | ===== Fabrice Laussy ===== | ||
''Liquid time and time liquids'' — | ''Liquid time and time liquids'' — 15:20-15:50 | ||
: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 $\tau=0$, 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}} | :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 $\tau=0$, 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}} | ||
| Line 214: | Line 217: | ||
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. | 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. | ||
== One picture is worth a thousand words == | |||
[[File:Screenshot_20250903_171405.png|thumb|120px|right]] | |||
For the [[Multiphotonics (2024)]], each participant contributed a formula, meaningful and/or inspiring for them, characteristic of their contribution to the field or merely illustrating their talk. Interestingly, there was no degeneracy: [[Rempe]] provided the [[Jaynes-Cummings Hamiltonian]], someone went for the mere harmonic oscillator (but wasn't [[Dirac]] saying it was enough to understand this?), {{I}} (Fabrice) offered the dissipative Jaynes-Cumming ladder formula, which I still haven't found in any publication earlier to mine{{cite|laussy12e}}, [[Eduardo]] provided the two-photon spectrum of resonance fluorescence, which produces the logo of the meeting. It was a nice way to make a logo. | |||
For this edition, we'd like to try the same thing but with a figure instead of a formula. This could be a graph, a density plot, the sketch of a concept (artistic or scientific), a diagram, the setup of an experiment, etc., with the same intent of providing a picture—call that a vision if you like—to illustrate the participants' understanding of the topic, ideally with a connection to their talk, even if a remote one. Out of this medley of visual cues to what light-matter interactions is about, we will build the logo of the 2025 meeting. | |||
== References == | == References == | ||
<references /> | <references /> | ||
Revision as of 15:44, 3 September 2025
The second MULTIPHOTONICS meeting will take place in Madrid, on 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
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.
Venue
ICMM-CSIC on the Cantoblanco Campus:
Hotel accommodation
External attendants will be provided with a two-nights (Tue 7 & Wed 9) hotel room with breakfast at the 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.
Confirmed Attendants
- Serge Reynaud* - 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
- Владислав Шишков (Vladislav Shishkov) - Aalto University, Espoo
- Juan Camilo López Carreño - University of Warsaw, Warsaw
- Yajun Wang - Shanxi University, China
- Alexandros Spiliotis - IESL-FORTH, Heraklion
- Natalia Armaou - Westlake University, China
- Moritz Meinecke - University of Würzburg, Würzburg
- Carlos Antón Solanas - Universidad Autónoma de Madrid
- Johannes Feist - Universidad Autónoma de Madrid
- Antonio Isaac Fernandez Dominguez - Universidad Autónoma de Madrid
- Alejandro González Tudela - IFF-CSIC, Madrid
- 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 - Universidad Autónoma de Madrid
- Carlos Sánchez - IFF-CSIC, Madrid
- Fabrice Laussy - ICMM-CSIC, Madrid
Tentative Program
Tuesday 7 October
Participants arrive.
Wednesday 8 October (Day 1)
Morning Session
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.[1]
Joaquin Guimbao Gaspar
10:00-10:30
Juan Camilo López Carreño
10:30-11:00
Coffee break
Post-coffee
Jesper Mørk
Quantum noise and squeezing in nanolasers. — 11:30-12:00
- We present a recently developed method for simulating quantum noise in nanolasers.[2][3] 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 at El Goloso — 13:30-15:00
Group photo
Afternoon Session
Philipp Schneeweiß
Tailoring photon statistics with an atom-based two-photon interferometer — 15:00-15:30
Based on Ref. [4].
Johannes Feist
15:30-16:00
Lukas Hanschke
16:00-16:30
Jacob Ngaha
16:30-17:00
Coffee break
Evening Session
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
Sven Höfling
9:00-9:30
Moritz Meinecke 
9:30-9:50
Tim Thomay
Higher-order Fock states for sensing applications. — 9:50-10:20
See Ref. [5].
Eduardo Zubizarreta Casalengua
10:20-10:50
Coffee break
Post-Coffee Session
Zhiliang Yuan
11:15-11:45
Carlos Antón Solanas
11:45-12:15
Sang Kyu Kim
12:15-12:35
Alejandro González Tudela
12:35-13:05
Lunch
Afternoon Session
Vincenzo D'Ambrosio
Tailoring spatial correlations with structured light — 14:00-14:30
Alexandros Spilioti
14:30-15:00
Natalia Armaou
Spatial correlations of opposite OAM states of light — 15:00-15:20
Fabrice Laussy
Liquid time and time liquids — 15:20-15:50
- 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.[6] 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.[7] 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 $\tau=0$, 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.[8] 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.[9] I will also describe how such a picture extends into multiphotonics,[10] and how one could observe such effects experimentally.[11]
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) Questions & Answers sessions, which contains information nowhere else to be found.
One picture is worth a thousand words
For the Multiphotonics (2024), each participant contributed a formula, meaningful and/or inspiring for them, characteristic of their contribution to the field or merely illustrating their talk. Interestingly, there was no degeneracy: Rempe provided the Jaynes-Cummings Hamiltonian, someone went for the mere harmonic oscillator (but wasn't Dirac saying it was enough to understand this?), I (Fabrice) offered the dissipative Jaynes-Cumming ladder formula, which I still haven't found in any publication earlier to mine[12], Eduardo provided the two-photon spectrum of resonance fluorescence, which produces the logo of the meeting. It was a nice way to make a logo.
For this edition, we'd like to try the same thing but with a figure instead of a formula. This could be a graph, a density plot, the sketch of a concept (artistic or scientific), a diagram, the setup of an experiment, etc., with the same intent of providing a picture—call that a vision if you like—to illustrate the participants' understanding of the topic, ideally with a connection to their talk, even if a remote one. Out of this medley of visual cues to what light-matter interactions is about, we will build the logo of the 2025 meeting.
References
- ↑ Unlocking multiphoton emission from a single-photon source through mean-field engineering., Sang Kyu Kim et al. arXiv:2411.10441 (2024).
- ↑ Stochastic Approach to the Quantum Noise of a Single-Emitter Nanolaser. M. Bundgaard-Nielsen, E. V. Denning, M. Saldutti and J. Mork in Phys. Rev. Lett. 130:253801 (2023).
- ↑ Simple yet Accurate Stochastic Approach to the Quantum Phase Noise of Nanolasers. M. Bundgaard-Nielsen, M. Saldutti, B. F. Gotzsche, E. Grovn and J. Mork in Phys. Rev. Lett. 134:213804 (2025).
- ↑ Tailoring Photon Statistics with an Atom-Based Two-Photon Interferometer. M. Cordier, M. Schemmer, P. Schneeweiss, J. Volz and A. Rauschenbeutel in Phys. Rev. Lett. 131:183601 (2023).
- ↑ Statistical model for quantum spin and photon number states. S. Powers, G. Xu, H. Fotso, T. Thomay and D. Stojkovic in Phys. Rev. A 111:012217 (2025).
- ↑ Two photons everywhere. E. Zubizarreta Casalengua, F. P. Laussy and E. del Valle in Phil. Trans. R. Soc. A 382:20230315 (2024).
- ↑ Perfect single-photon sources. S. Khalid and F. P. Laussy in Sci. Rep. 14:2684 (2024).
- ↑ Photon liquefaction in time. E. Zubizarreta Casalengua, E. del Valle and F. P. Laussy in APL Quant. 1:026117 (2024).
- ↑ Crystals in Time. F. Wilczek in Sci. Am. 32:28 (2019).
- ↑ Correlations in circular quantum cascades. M. A. Palomo Marcos, E. Zubizarreta Casalengua, E. del Valle and F. P. Laussy in Phys. Rev. A 111:023704 (2025).
- ↑ Correlations in a three-level system, A. Barreto Padrón, E. del Valle and F. P. Laussy, unpublished.
- ↑ Climbing the Jaynes-Cummings ladder by photon counting. F. P. Laussy, E. del Valle, M. Schrapp, A. Laucht and J. J. Finley in J. Nanophoton. 6:061803 (2012).