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Revision as of 16:13, 15 June 2026
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1 June (2026)
Good start of a new month is usually by testing one's implementation of one's own micro-blogging platform.
06:13 (CET).
Receding into words, and then receding into less than words...
08:07 (CET).
I should implement sub-threads, to be able to follow up the above one with:
"When there are no bugs, what is left is only philosophical angst."08:09 (CET).
So now I have something to do, threading... I have to give a talk at 11h30 too; the problem is never that one has nothing to do. The problem is, one has nothing to do which brings them closer to what they want to be.
08:11 (CET).
I give a seminar on our multiphoton physics at Sven Höfling's group in Würzburg.
Gave my talk, 1h15 or so, where I enticed people to resolve pending issues on frequency-resolved theory (e.g., Panyukov et al. vs us) and to try other things as well. Then I attended the colloquium by Peter Liljerot on 2D quantum materials probed by STM, although it's all single-tip physics (and mostly tunel voltage dI/dB), in stark contrast to my morning preach. Have an hour free to prepare the next talk on polariton superconductivity.
16:06 (CET).
2 June (2026)
My digital signature reads "LAUSS -- Y", almost Laus Y or Laus 𝕐. What an iron-y.
Two meetings today, with the QD group (mainly Moritz) and the Polariton group (much bigger, with at least two Simons); I now have to prepare the promised digest reports which are so cheap to offer on the go ("I'll send you the references") but are a real effort afterwards, especially as the social program is so generous, so that sleeping time is reduced to the darkest hours of the early morning, furthermore, in a place where they drink wine, not beer.
4 June (2026)
First time I could get some sleep; today is bank holiday in Mainz: Fronleichnam (Corpus Christi). We'll be visiting some areas of Würzburg. I realized yesterday I need 𝕐 on my phone! This will be more ambitious coding...
10:29 (CET).
Visited Veitshöchheim with Sven, its Schlöss and Rokokogarten, from a boat trip on the Main.
First 𝕐 post from my phone, although still on the local wiki... Details from a status in the park—Chronos clipping the wing of Cupid—taken earlier today (but posted only now).
(Didn't require that much coding after all)
20:03 (CET).
5 June (2026)
Catching up with deadlines in the middle of the night... Mainly Daniel's last TFM corrections & (digital) paperwork.
03:41 (CET).
Spent the day in Bad Kissingen with Sven.
6 June (2026)
First day of my visit at Sven's group fully on my own. I'll update 𝕐 so that I can use it from my phone, allowing me to μ-blog live and in real time... and if ready in time, I will use it for my visit downtown. I was thinking to walk through the vineyards but this might be too far. Some emails and code first.
10:46 (CET).
This is the first 𝕐 post I made directly from the live (online) wiki. I'll also need a separate mechanism to sync posts made locally and those made in real time, but this doesn't seem too difficult.
Breakfast at the hotel a couple of hours ago... This is posted from the phone and on the online wiki, though not capturing "the action" in real time as I'm testing this and have nothing nice to snapshot now, myself least of all. I took this picture earlier this morning for the tiny Weißwürste:
Okay, I now have everything ready to bring 𝕐 with me on my tour in Würzburg. This will be my first live-documented journey, a bit similar to what I was doing with Twitter's OuSommesNous account, many years ago. Pictures were not that well supported then by Twitter, so unfortunately they were stored on a platform which doesn't exist anymore and all the content was lost. Never trust anybody! Making 𝕐 even more compelling.
11:57 (CET).
So this is my first live post... The little path intersection of the Albert-Hoffa-Straße I walk around when I wait for the bus...
Trumpet at the Residenz.
12:31 (CET).
Below the greatest fresco in the world.
12:46 (CET).
In the Spiegelkabinett.
Out of Residenz and now in the Hofgarten.
Me paenitet Faber.
15:26 (CET).
The best Tilman Riemenschneider collection in the world.
Würzburg from its fortress.
17:31 (CET).
People on the old bridge.
18:12 (CET).
And back at Melchior park.
18:56 (CET).
Today's visit of Würzburg was a double success. On its own, but also as a full-fledged test of 𝕐. It worked great except the http error caused by cloudflare, which I should try to shunt for myself. I will now try to see how to merge online/offline versions of my μ-blogging in a robust way, visit the sauna and have dinner at the hotel, leaving real work for after dinner.
19:05 (CET).
Now I have a working script (syncy) that fetches both pages and merge them in a text file. I have to see how it handles conflicts, e.g., two identical entries that differ from their content, likely due to post-editing, but have the same timestamp (and in principle same content). This probably requires to track the last editing time, which might be desirable to also have anyway.
21:57 (CET).
7 June (2026)
I'm going to bed. Neither tea nor coffee, not even water, in the hotel room, make it difficult for me to look for python bugs. I also need to reflect in the solitude of the night on the exacerbated feelings captured in the Residenz pinakothek. I was particularly moved by Hercules and Omphale as the Goddess had a look and a grip on the poor hero which I found relatable.
00:14 (CET).
I've been having lots of nightmares for the past year, and otherwise barely remember my dreams. This night, I had one which I actually remembered, and it was not a nightmare, quite the opposite. Someone who can take on many different appearances but who, in this particular dream, had the playful look you’d find in a phone booth, with a huge smile, was waiting for another person to give her something on my behalf. She seemed pleased. So it was a pleasant dream. Maybe this comes from all the Pinakothek art that’s been brewing subconsciously in my mind. In those museums, the angst of all humanity, condensed into corridors, can put your own miseries, your own uncertainties, and your own despair into a broader universal perspective. I should go to museums more often.
10:50 (CET).
I mentioned Hercules and Omphale already. Omphale's pause reminded me of the phone booth character, but not from the phone booth, from other occasions when she brought her hand close to her face, without touching it, as if suspending everything to some imminent revelation, elevation or something that, however, never comes, as the hand slowly drifts down again. I have written a bit on limerence and also want to write on synesthesia, before I lose interest. I don't go enough to museums nowadays but I spend time looking at artistic video clips. I came back to Mano Negra's unique masterpieces, which have a lot of hidden messages. There's a scene in Mala Vida in particular which is killing me everytime... and that is also connected to my enduring synesthetic limerence.
Sven just called with the plans for the day... I should have more friends too.
11:04 (CET).
I wrote about this section from Mano Negra's Mala Vida that gets me every single time, when the bride marries the fugitive for the time of an encounter. The bride also has this particular "grammar" to her face which, with a nod of her head and a subconscious wink of her eye, can convey volumes of literature and all the space needed to host sculptures and painting that reflect the same untold sentiments. I've seen someone with the same look once, almost the same face. Not particularly pretty in itself, but, because it is everything, beautiful instead.
12:32 (CET).
Leaving for Würzburg now. This will be the occasion for a second round of tests as I have hacked quite a few things in the synchronization, which actually had crashed the live version minutes before leaving (js uploaded as wikitext).
13:32 (CET).
Wineland.
15:49 (CET).
Burgerbraus.
16:46 (CET).
Maxjoseph concert in the brewry.
17:11 (CET).
The artists.
17:32 (CET).
Entracte.
18:20 (CET).
Sven getting an autographed version of their first album.
18:38 (CET).
The encore.
8 June (2026)
Last day in Würzburg. Morning meeting with Simon Betzold (Krishna was on holiday) on implementations of liquid light: we discussed QDM, 3-level systems, topology, floquet, bi-exciton and will keep in touch.
11:18 (CET).
Second meeting, this time with Subhamoy on very strong coupling in hybrid structures, and possible quantum-optical versions of that.
13:20 (CET).
I've replaced my older template {{#expr:({{#time: U | now }}-{{#time: U | 1977-09-30 }})/(365*86400) round 1}} with something like {{since|30-September-1977}}.
13:48 (CET).
Things to look at for the VSC include [1] (experimental verification), [2] (departure of VSC from SC) and a couple of other papers that Subhamoy will send. For liquid light, [3] for non-reciprocal Floquet and [4] for topological approaches, as rough anchors from many other approaches.
14:03 (CET).
Testing my "since" template, writing this now, which is just now (or, less precise, ). Or if I specify the time myself, this is .
14:19 (CET).
End of my stay in Würzburg.
14:40 (CET).
Leaving Würzburg and its vineyards.
15:49 (CET).
The other VSC papers are [5] and [6].
16:24 (CET).
Testing my Since template from the ICE. I've written this .
How it feels like to travel with DB.
17:36 (CET).
La solitude éternelle de ces aéroports infinis m'effraie.
18:17 (CET).
Avec Peyrefitte et De Gaulle pour les cinq prochaines heures.
18:22 (CET).
Boarded...
20:54 (CET).
9 June (2026)
Back to Spain.
00:20 (CET).
Back home with much to do after my Würzburg visit and my coming Russia visit. I left with a most minimal installment of 𝕐 and come back with something almost as mighty as Twitter itself, thanks to which I am still sileto there. Hopefully forever now. It would be difficult without 𝕐 as I seem to need such a not-altogether-private venue where to collapse my thoughts.
10:22 (CET).
Lots of things to do. For the week, flush our two papers, including the experimental one, and also keep up the momentum with the Würzburg teams. For today, all the pending administration, paperwork, emails, especially scientific emails, late referrals and travailler notre jardin which is becoming dangerously wild. I'll start with emails.
10:34 (CET).
Vitoria-Soto-Cantoblanco alignment. We're missing a general framework while we're able to handle all particular cases one by one.
13:14 (CET).
Support letter for Andreas Muller's chair. He could measure what everybody else was telling me was either hopeless or simply just impossible. He'll eventually be recognized as a pioneer of multiphotonics. The later this will happen, the greater will be his glory. I hope he at least gets professor as soon as possible.
20:22 (CET).
Oh so if you're born in 1996, you're from Generation Y! Of course...
22:12 (CET).
I tweaked my cite and onlinecite templates to display the references with wz upon hovering, along with my bibTeX key, e.g., Ref. [1].
22:44 (CET).
I also upgraded bib2wiki to write directly into the local database, as opposed to copy/pasting as before. This speeds up considerably the process for multiple references.
23:31 (CET).
Vámonos por la luna en el cielo,
Vámonos la luna se va,
Síguela,
Ta' buena la noche.23:57 (CET).
10 June (2026)
I rewrote extensively llw2lw (going v°2) to automatize the synchronization. The 𝕐 functionalities proved useful for many other timesaving services.
00:34 (CET).
38.42€ con descuento. They give higher discounts for 30L but this is difficult to reach as it's the maximum capacity of my car, so I need to bring it to the station running on fumes. On ne prête qu'aux riches.
10:47 (CET).
We might have completed my last-month objective of identifying the multiphoton phase-space where every event is one deterministic point from a quantum-state distribution in a weird canonical geometry. The geometries are beautiful (a tango-looking ℤ for three photons).
12:11 (CET).
11 June (2026)
Template to navigate 𝕐 days on each of its pages.
01:03 (CET).
Full glorious morning with paperwork...
13:35 (CET).
Our new understanding of $g^{(n)}$ as probabilities on canonical surfaces.
15:17 (CET).
The big dilemma of today... which color code to use now that we are working on restricted spaces? Blue for antibunching doesn't work anymore.
16:27 (CET).
The minimal unit that captures all three-photon distributions in space looks like a farfalle. The node is at $(\theta_1,\theta_2,\theta_3)=(-{\pi\over4},0,{\pi\over4})$ which defines the boundary of the hardcore photon-bowtie of aligned frames.
18:19 (CET).
The farfalle (black) on the ℤ.
19:18 (CET).
With the consecration of the Tower of Jesus by the pope, the Sagrada Família becomes the tallest church in the world!
23:32 (CET).
12 June (2026)
Nightmare of last night: bus ride on a rooftop whose female driver was trying to crush me at the terminus after witnessing my precarious situation the entire ride.
08:39 (CET).
Graduación de Pin Pin.
09:40 (CET).
Daniel en Soto.
14:50 (CET).
Quantum farfadelles. We'll call them "farfadelles", after all, not "farfalles"... No room for Italian cuisine in French-Colombiano pasta in Spain.
20:50 (CET).
13 June (2026)
In the Vat of Acid Episode S04E08, there is this interesting experience where Morty meets his soulmate only to be later placed in the situation where she is estranged from him, and there is nothing he can do or explain that will not freak her out, even though he can start fresh but from a point where he only has memories, while she only has prejudices. An interesting losing game in alternative realities, especially as the virtual betrothed is a strong-willed glass-wearing INTJ brunette with big eyes and a moody smile, who becomes forever out of reach after one singular grip to her inner world. The scene where Morty repeatedly resets into an impossible attempt at connecting with her, resulting in agony for him and escape in shock and fear for her, is devastating. I hear the episode made a lasting impression on many.
Statement on the US government directive to suspend access to Fable 5 and Mythos 5 [1]:
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.
10:29 (CET).
Daniel just fixed the color code for multiphoton correlations: white for 0 (impossible; was blue before), blueish for 0<values<1, black for 1 (uncorrelated; was white before) and reddish for >1. Impossibility becomes a new color and we traded uncorrelation for its opposite. It makes more sense, is also beautiful, we'll have to revisit all the two-photon spectra in this way!
10:53 (CET).
I don't know what has been the most painful since November (2025). That it was the beginning of my ineluctable forever drifting away from my periapsis. Or that my focal point wrote "Reseracher" and is taking astronomical ages to realize that.
16:26 (CET).
I still refer to her a lot although I felt on a few occasions that the gravitational pull was now much gentler, with less acceleration (or deceleration, for that matter), that the point of no return has long been crossed, let alone that the escape velocity was orders of magnitude above what it should have been, anyway. But sometimes I glance back, and since light goes much farther and much faster, although it's mechanically completely gone for many months, now, I still have some dim halo of her mysterious light shining through the empty night to accompany me. Besides, you don't switch off a sun completely so easily when you're a speck of dust in the Halley trail that didn't tie its asteroid belt. The mechanics of orbiting bodies is unfair. One doesn't care and doesn't notice, the other is in free fall but away from its center of attraction. Death by inertia.
20:02 (CET).
Speaking about light and what it can carry or not, starlight is always beautiful, but often the star is dead, and always the star is too far anyway. That's a bit of an instant killer for any poet marvelling at the night sky, I would say. We're looking at an infinity of impossibilities, at an explosion of frustrations: it's all so beautiful, yet not for you, never for you.
‒ Cape caelum manu.
‒ Nimis altum.It should stop there. There's nothing beyond that.
20:17 (CET).
and we're only talking about a coffee anyway... I wish I could finish writing this paper, and stop feeling like a fish on a fisherman's stall, slit opened with no guts but only feelings of ache in their place, from sensing a terrible absence, and, worst of all, with a pathetic, desolate, laughable expression on a stupid face. I should go sileto here too... and then, what? ℤ? Funnily enough, this paper I should be writing instead of this, involves a ℤ. The irony is too cruel to be completely fortuitous, which brings me back to her, all those coincidences, all this awakening... to a dark sky full of dead stars. I see no exit out of it... Nunc siste, nunc desine...
20:35 (CET).
What a long, painful, lonely 13th of June... I feel I'll feel better when it strikes midnight.
23:12 (CET).
Might leave the paper for today at this stage:
This figure provides a comprehensive picture of multiphoton physics. It shows that each multiphoton event—once stripped of its confounding factors—can be described as a single point in a canonical space which exhausts the realm of possibilities, and that correlations result from the density with which each possible realization occurs. Some configurations become impossible for particular quantum states, e.g., three photons from a Fock state $\ket{1,2}$ can never ...We understood a lot of things today... quite beautiful. If only I was more obsessed by the Z than by the Y.
23:24 (CET).
14 June (2026)
Talking with Daniel over dinner, I got to formulate the following conjecture, which looks like a generalization of de Finetti's theorem: proposition A being that no configurations are impossible in a correlated way and B being that the observables result from conditionally independent sampling relative to some confounding variable, then A⇔B. I believe that A⟹B is easy to prove, but I'm not sure about the reciprocal.
01:32 (CET).
Main goal of today would be to understand in details de Finetti's theorem. And get the manuscript to a stage where it can be circulated with co-authors (in which case the main narrative should be quite advanced to receive a first honest brutal feedback).
10:12 (CET).
One of the central results; we obtained it yesterday but it only gets in the manuscript now:
Crucially, some configurations become impossible on this canonical space for particular quantum states, e.g., three photons from a Fock state $\ket{1,2}$ can never satisfy $(\theta_1,\theta_2,\theta_3)=(0, {\pi\over3},{2\pi\over3})+\vartheta$ for $0\le\vartheta\le{\pi\over6}$.10:59 (CET).
Un altar en la calle en el centro de Soto, con gente tomando refrescos al lado...
12:14 (CET).
Y eso me recuerda su «¡pero no uses tu vale de refrigerio!» cuando estábamos en la cola y ella había extraviado el suyo, y se le dio el mío. Esa palabra que no conocía, "refrigerio", que me pareció fuera de lugar en el programa, desconsagrada, se convirtió en su boca en un altar plantado aquí dentro de la fila de la gente, como este que acabo de ver en el pueblo. Locum refrigerii, lucis et pacis. Es gracioso cómo cualquier nada era como un encuentro con el universo entero, todo focalizado en lo poco que se concentraba en un tono de voz, un acento raro pero suave, una expresión de ofuscación amigable, de reproche tierno, un "gracias" protegido por "¡pero qué absurdo!" Es graciosa esa capacidad de transformar todo, lo más común, en escenas sagradas... ¿Es ella? ¿O era yo? ¿O era ella conmigo? ¿O era yo con ella? Acabo de encontrar un artículo de Fuchs sobre el quantum de Finetti theorem.[7] Parece que estoy yendo desde entonces—desde el refrigerio—a un lugar donde algo me está esperando. Eso mismo que esperaba a Honda.
12:48 (CET).
Details for my talk at the ACTP have landed:
Next week on Wednesday, at the usual time, ACTP will host its weekly seminar. Our speaker is a friend of our center, Fabrice Laussy (ICMM). The seminar will take place on the 17th of June 2026 at 11 a.m., Moscow time.
In-person
Location: Moscow Institute of Physics and Technology, radio-engineering building, first floor. Exact address: Institutskiy per., 9, Dolgoprudny, Moscow region. Exact coordinates: (55.9297153, 37.5164589)Online
Zoom meeting link: https://zoom.us/j/91219988510 Meeting ID: 912 1998 8510 Passcode: 201351Title
Correlations: the individual vs the ensemble.Abstract
Since at least the 18th century, there have been disputes over the meaning of probabilities. Bayesianism, in particular, has been quite successful in tormenting people's understanding of the nature of reality with concepts such as subjective priors and degrees of belief. In the quantum age, such a tension became the central component of the interpretation of the theory which describes, ultimately, statistical correlations. I will present our description of multiphoton spatial correlations of various quantum states—as can be realized in photonics or condensed-matter platforms, such as polaritons—including unexpected features such as bosons extremizing their distances or bunching being an artifact of a classical (so-called Simpson's) paradox; introduce a quantum-state ergodic hypothesis which separates single-collapse (quantum) averages from ensemble ones; and discuss how such a framework might offer new avenues into the otherwise largely philosophical problem of quantum foundations and interpretations of quantum mechanics.18:53 (CET).
15 June (2026)
After EIC auditing and PRL DAE meeting, now some time to think...
17:09 (CET).
Let's see what post Mishima Japan litterature has to offer...
17:28 (CET).
- ↑ 1.0 1.1 Experimental Verification of the Very Strong Coupling Regime in a GaAs Quantum Well Microcavity. S. Brodbeck, S. De Liberato, M. Amthor, M. Klaas, M. Kamp, L. Worschech, C. Schneider and S. Höfling in Phys. Rev. Lett. 119:027401 (2017).
- ↑ Tunable Room‐Temperature Polaritons in the Very Strong Coupling Regime in Quasi‐2D Ruddlesden–Popper Perovskites. H. Adl, C. Bennenhei, M. Struve, P. Peksa, M. Dyksik, M. Baranowski, K. Song, M. Gittinger, C. Lienau, J. König, J. Fitzgerald, N. Jasti, F. Eilenberger, P. Plochocka, E. Malic, O. Kyriienko, M. Esmann and C. Schneider in Adv. Opt. Mater. 13: (2025).
- ↑ Non-reciprocal photonics based on time modulation. D. Sounas and A. Alù in Nature Photon. 11:774 (2017).
- ↑ Room temperature strong coupling in a semiconductor microcavity with embedded AlGaAs quantum wells designed for polariton lasing. H. Suchomel, S. Kreutzer, M. Jörg, S. Brodbeck, M. Pieczarka, S. Betzold, C. Dietrich, G. Sęk, C. Schneider and S. Höfling in Opt. Express 25:24816 (2017).
- ↑ Excitonic radius in the cavity polariton in the regime of very strong coupling. J. Khurgin in Solid State Commun. 117:307 (2001).
- ↑ Very strong coupling in GaAs-based optical microcavities. H. Zhang, N. Kim, Y. Yamamoto and N. Na in Phys. Rev. B 87:115303 (2013).
- ↑ Unknown quantum states: The quantum de Finetti representation. C. Caves, C. Fuchs and R. Schack in J. Math. Phys. 43:4537 (2002).