Mattia Walschaers
@walschaers.eu
CNRS researcher @lkblab.bsky.social in Paris. Theoretical quantum physicist, working on quantum optics, and continuous-variable systems.
(Pour-over) coffee nerd ☕️
He/him
(Pour-over) coffee nerd ☕️
He/him
Reposted by Mattia Walschaers
🚨The 2025 #NobelPrize for Physics goes to John Clark, Michel Devoret & John Martinis “for the discovery of macroscopic quantum mechanical tunnelling and energy quantization in an electric circuit”. More details soon... ⚛️🧪
physicsworld.com/a/john-clark...
physicsworld.com/a/john-clark...
John Clarke, Michel Devoret and John Martinis win the 2025 Nobel Prize for Physics – Physics World
Trio honoured for their work on quantum tunnelling
physicsworld.com
October 7, 2025 at 9:54 AM
🚨The 2025 #NobelPrize for Physics goes to John Clark, Michel Devoret & John Martinis “for the discovery of macroscopic quantum mechanical tunnelling and energy quantization in an electric circuit”. More details soon... ⚛️🧪
physicsworld.com/a/john-clark...
physicsworld.com/a/john-clark...
Reposted by Mattia Walschaers
The pioneering work of Clarke, Devoret, and Martinis showed that very cold electrical circuits behave in ways that exhibit fundamental principles of quantum physics.
www.nobelprize.org/prizes/physi...
www.nobelprize.org/prizes/physi...
Nobel Prize in Physics 2025
The Nobel Prize in Physics 2025 was awarded jointly to John Clarke, Michel H. Devoret and John M. Martinis "for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an...
www.nobelprize.org
October 7, 2025 at 2:35 PM
The pioneering work of Clarke, Devoret, and Martinis showed that very cold electrical circuits behave in ways that exhibit fundamental principles of quantum physics.
www.nobelprize.org/prizes/physi...
www.nobelprize.org/prizes/physi...
Not sure if there are any #coffee lovers out there among my followers? If so, this one's for you. ☕
I just got a Hario Switch after a lot of hesitation, thinking that it would not make much of a difference. After brewing a few cups with it, I am genuinely amazed by the result. Strongly recommended!
I just got a Hario Switch after a lot of hesitation, thinking that it would not make much of a difference. After brewing a few cups with it, I am genuinely amazed by the result. Strongly recommended!
September 18, 2025 at 9:23 AM
Not sure if there are any #coffee lovers out there among my followers? If so, this one's for you. ☕
I just got a Hario Switch after a lot of hesitation, thinking that it would not make much of a difference. After brewing a few cups with it, I am genuinely amazed by the result. Strongly recommended!
I just got a Hario Switch after a lot of hesitation, thinking that it would not make much of a difference. After brewing a few cups with it, I am genuinely amazed by the result. Strongly recommended!
This one just dropped!
Using parameter estimation techniques to efficiently characterise Gaussian states of light.
journals.aps.org/prl/abstract...
Using parameter estimation techniques to efficiently characterise Gaussian states of light.
journals.aps.org/prl/abstract...
Optimal Moment-Based Characterization of a Gaussian State
Fast and precise characterization of Gaussian states is crucial for their effective use in quantum technologies. In this work, we apply a multiparameter moment-based estimation method that enables rap...
journals.aps.org
September 15, 2025 at 3:53 PM
This one just dropped!
Using parameter estimation techniques to efficiently characterise Gaussian states of light.
journals.aps.org/prl/abstract...
Using parameter estimation techniques to efficiently characterise Gaussian states of light.
journals.aps.org/prl/abstract...
It's a bit haunting to be alone in a room with Van Gogh...
I recommend everyone who likes art to get a carte blanche at @museeorsay.bsky.social, which gives you entry 30 minutes before the museum opens to the crowds!
I recommend everyone who likes art to get a carte blanche at @museeorsay.bsky.social, which gives you entry 30 minutes before the museum opens to the crowds!
September 5, 2025 at 10:18 AM
It's a bit haunting to be alone in a room with Van Gogh...
I recommend everyone who likes art to get a carte blanche at @museeorsay.bsky.social, which gives you entry 30 minutes before the museum opens to the crowds!
I recommend everyone who likes art to get a carte blanche at @museeorsay.bsky.social, which gives you entry 30 minutes before the museum opens to the crowds!
What happens when you put a bunch of highly talented first-year master students together with a brilliant post-doc? First, there is a lot of magic involving algebraic geometry and then you have a protocol for generating arbitrary multimode multi-photon states! 💪
arxiv.org/abs/2507.19397
arxiv.org/abs/2507.19397
July 28, 2025 at 2:52 PM
What happens when you put a bunch of highly talented first-year master students together with a brilliant post-doc? First, there is a lot of magic involving algebraic geometry and then you have a protocol for generating arbitrary multimode multi-photon states! 💪
arxiv.org/abs/2507.19397
arxiv.org/abs/2507.19397
Reposted by Mattia Walschaers
📣 Le Palais de la Découverte a besoin de vous !
Musée de sciences installé à proximité des Champs-Élysées, il attire les curieux et férus de science depuis son ouverture en 1937.
Fermé depuis 2020 pour rénovation, sa réouverture est aujourd'hui menacée.
Musée de sciences installé à proximité des Champs-Élysées, il attire les curieux et férus de science depuis son ouverture en 1937.
Fermé depuis 2020 pour rénovation, sa réouverture est aujourd'hui menacée.
June 20, 2025 at 4:56 PM
📣 Le Palais de la Découverte a besoin de vous !
Musée de sciences installé à proximité des Champs-Élysées, il attire les curieux et férus de science depuis son ouverture en 1937.
Fermé depuis 2020 pour rénovation, sa réouverture est aujourd'hui menacée.
Musée de sciences installé à proximité des Champs-Élysées, il attire les curieux et férus de science depuis son ouverture en 1937.
Fermé depuis 2020 pour rénovation, sa réouverture est aujourd'hui menacée.
Dear friends and colleagues from the physics community, be sure not to forget that you can nominate young researchers for the early career prize of New Journal of Physics! 🏆
iopscience.iop.org/journal/1367...
iopscience.iop.org/journal/1367...
Early Career Award - New Journal of Physics - IOPscienceSearch
iopscience.iop.org
June 16, 2025 at 10:33 AM
Dear friends and colleagues from the physics community, be sure not to forget that you can nominate young researchers for the early career prize of New Journal of Physics! 🏆
iopscience.iop.org/journal/1367...
iopscience.iop.org/journal/1367...
Hello #quantum community! Just a little heads up that there is still some time to apply !
🌟 Post-Doc Opportunity in Quantum Computing! 🌟
Join us at @lkblab.bsky.social in Paris to explore photonic quantum computing. Apply by June 15th, 2025.
🔗 Job Announcement: www.lkb.fr/multimodequa...
#QuantumComputing #PostDoc #JobOpportunity
Join us at @lkblab.bsky.social in Paris to explore photonic quantum computing. Apply by June 15th, 2025.
🔗 Job Announcement: www.lkb.fr/multimodequa...
#QuantumComputing #PostDoc #JobOpportunity
June 13, 2025 at 10:51 AM
Hello #quantum community! Just a little heads up that there is still some time to apply !
Reposted by Mattia Walschaers
New paper out! We resonantly couple a superconducting heavy-fluxonium qubit ⚛️ to a macroscopic membrane 🥁 oscillating at a few MHz. ~300 repeated interactions let us track its quantum motion, observe back-action & probe non-commuting operators. Diósi–Penrose next? (1/8)
arxiv.org/abs/2505.21481
arxiv.org/abs/2505.21481
Probing the quantum motion of a macroscopic mechanical oscillator with a radio-frequency superconducting qubit
Long-lived mechanical resonators like drums oscillating at MHz frequencies and operating in the quantum regime offer a powerful platform for quantum technologies and tests of fundamental physics. Yet,...
arxiv.org
May 28, 2025 at 5:25 PM
New paper out! We resonantly couple a superconducting heavy-fluxonium qubit ⚛️ to a macroscopic membrane 🥁 oscillating at a few MHz. ~300 repeated interactions let us track its quantum motion, observe back-action & probe non-commuting operators. Diósi–Penrose next? (1/8)
arxiv.org/abs/2505.21481
arxiv.org/abs/2505.21481
🌟 Post-Doc Opportunity in Quantum Computing! 🌟
Join us at @lkblab.bsky.social in Paris to explore photonic quantum computing. Apply by June 15th, 2025.
🔗 Job Announcement: www.lkb.fr/multimodequa...
#QuantumComputing #PostDoc #JobOpportunity
Join us at @lkblab.bsky.social in Paris to explore photonic quantum computing. Apply by June 15th, 2025.
🔗 Job Announcement: www.lkb.fr/multimodequa...
#QuantumComputing #PostDoc #JobOpportunity
May 19, 2025 at 9:42 AM
🌟 Post-Doc Opportunity in Quantum Computing! 🌟
Join us at @lkblab.bsky.social in Paris to explore photonic quantum computing. Apply by June 15th, 2025.
🔗 Job Announcement: www.lkb.fr/multimodequa...
#QuantumComputing #PostDoc #JobOpportunity
Join us at @lkblab.bsky.social in Paris to explore photonic quantum computing. Apply by June 15th, 2025.
🔗 Job Announcement: www.lkb.fr/multimodequa...
#QuantumComputing #PostDoc #JobOpportunity
Reposted by Mattia Walschaers
Being a quantum optics group in the city of lights, we love light!
Happy international day of light, everyone!
#dayoflight
Happy international day of light, everyone!
#dayoflight
May 16, 2025 at 3:55 PM
Being a quantum optics group in the city of lights, we love light!
Happy international day of light, everyone!
#dayoflight
Happy international day of light, everyone!
#dayoflight
Our paper "Purification of Gaussian states by photon subtraction or addition" is now published in PRA! 🎉
We explore how, surprisingly, photon subtraction and addition can enhance Gaussian state purity, revealing new potential in quantum optics.
journals.aps.org/pra/abstract...
#QuantumOptics
We explore how, surprisingly, photon subtraction and addition can enhance Gaussian state purity, revealing new potential in quantum optics.
journals.aps.org/pra/abstract...
#QuantumOptics
Purification of Gaussian states by photon subtraction or addition
Photon subtraction (PS) can enhance entanglement, which, for pure states, induces a decrease in the purity of reduced states. In contrast, by analyzing the purities of Gaussian states before and after...
journals.aps.org
May 7, 2025 at 2:46 PM
Our paper "Purification of Gaussian states by photon subtraction or addition" is now published in PRA! 🎉
We explore how, surprisingly, photon subtraction and addition can enhance Gaussian state purity, revealing new potential in quantum optics.
journals.aps.org/pra/abstract...
#QuantumOptics
We explore how, surprisingly, photon subtraction and addition can enhance Gaussian state purity, revealing new potential in quantum optics.
journals.aps.org/pra/abstract...
#QuantumOptics
I think I completed the next level of "being french".
May 6, 2025 at 5:23 PM
I think I completed the next level of "being french".
📢 Service announcement for the #quantum crowd : PRX Quantum just updated its acceptance criteria.
This update is a clarification and does not change editorial practices. However, it should make it easier for you to choose what to submit to the journal.
journals.aps.org/prxquantum/a...
This update is a clarification and does not change editorial practices. However, it should make it easier for you to choose what to submit to the journal.
journals.aps.org/prxquantum/a...
Editorial: Clarifying PRX Quantum's Acceptance Criteria
PRX Quantum 6, 020001 (2025)
journals.aps.org
May 6, 2025 at 5:27 AM
📢 Service announcement for the #quantum crowd : PRX Quantum just updated its acceptance criteria.
This update is a clarification and does not change editorial practices. However, it should make it easier for you to choose what to submit to the journal.
journals.aps.org/prxquantum/a...
This update is a clarification and does not change editorial practices. However, it should make it easier for you to choose what to submit to the journal.
journals.aps.org/prxquantum/a...
Finally, a holiday I celebrate. Happy 4th of May from behind my mug of tea, everyone!
May 4, 2025 at 10:27 AM
Finally, a holiday I celebrate. Happy 4th of May from behind my mug of tea, everyone!
C'est trop bien !
Aujourd'hui, je vous montre et je vous fais entendre... le 1er son jamais enregistré ! Ouvrez vos yeux et vos oreilles.
youtube.com/shorts/NyWBI...
Merci à l'Académie des Sciences @academiesciences.bsky.social pour son accueil.
youtube.com/shorts/NyWBI...
Merci à l'Académie des Sciences @academiesciences.bsky.social pour son accueil.
Le premier son enregistré (vidéo n°451)
YouTube video by Julien Bobroff
youtube.com
April 30, 2025 at 8:07 AM
C'est trop bien !
🌟 Quantum Community, Help Needed! 🌟
My tutorial "Non-Gaussian States and Where to Find Them" needs a few updates. If you've spotted errors, please share! Let's improve it together.
journals.aps.org/prxquantum/a...
#QuantumOptics #Feedback
My tutorial "Non-Gaussian States and Where to Find Them" needs a few updates. If you've spotted errors, please share! Let's improve it together.
journals.aps.org/prxquantum/a...
#QuantumOptics #Feedback
Non-Gaussian Quantum States and Where to Find Them
A phase-space exploration of continuous-variable systems is presented, guiding newcomers through the methodology needed for investigating non-Gaussian states.
journals.aps.org
April 16, 2025 at 6:25 AM
🌟 Quantum Community, Help Needed! 🌟
My tutorial "Non-Gaussian States and Where to Find Them" needs a few updates. If you've spotted errors, please share! Let's improve it together.
journals.aps.org/prxquantum/a...
#QuantumOptics #Feedback
My tutorial "Non-Gaussian States and Where to Find Them" needs a few updates. If you've spotted errors, please share! Let's improve it together.
journals.aps.org/prxquantum/a...
#QuantumOptics #Feedback
Reposted by Mattia Walschaers
🎨The Sensation Quantique exhibition, blending art and science, opens today at the Institut Henri Poincaré and runs until July 25.
Go check it out!
🔗 More info here: lnkd.in/dnp6C9Rw
@sorbonne-universite.fr @normalesup.bsky.social
@collegedefrance.bsky.social
Go check it out!
🔗 More info here: lnkd.in/dnp6C9Rw
@sorbonne-universite.fr @normalesup.bsky.social
@collegedefrance.bsky.social
April 10, 2025 at 8:01 AM
🎨The Sensation Quantique exhibition, blending art and science, opens today at the Institut Henri Poincaré and runs until July 25.
Go check it out!
🔗 More info here: lnkd.in/dnp6C9Rw
@sorbonne-universite.fr @normalesup.bsky.social
@collegedefrance.bsky.social
Go check it out!
🔗 More info here: lnkd.in/dnp6C9Rw
@sorbonne-universite.fr @normalesup.bsky.social
@collegedefrance.bsky.social
One of the surprising joys of parenthood is waking up at 5.30 am and listening to the imperial march together with your baby.
The force is strong in this one...
The force is strong in this one...
darth vader holding a red light saber in a dark room
Alt: darth vader holding a red light saber in a dark room
media.tenor.com
April 7, 2025 at 5:16 AM
One of the surprising joys of parenthood is waking up at 5.30 am and listening to the imperial march together with your baby.
The force is strong in this one...
The force is strong in this one...
Now that I have some time. Here are a few more words on this work.
At its root, this work started from a simple question: is non-Gaussianity fundamentally useful in quantum metrology?
At its root, this work started from a simple question: is non-Gaussianity fundamentally useful in quantum metrology?
📃 Heisenberg put limits on how well we can jointly *measure* position and momentum. However, these limits do not apply in the framework of estimation theory. In our new work, we show that non-Gaussianity is a crucial resource to increase precision in such estimation.
arxiv.org/abs/2504.01910
arxiv.org/abs/2504.01910
Joint estimation of position and momentum with arbitrarily high precision using non-Gaussian states
We address the joint estimation of changes in the position and linear momentum of a quantum particle or, equivalently, changes in the complex field of a bosonic mode. Although these changes are genera...
arxiv.org
April 4, 2025 at 3:29 PM
Now that I have some time. Here are a few more words on this work.
At its root, this work started from a simple question: is non-Gaussianity fundamentally useful in quantum metrology?
At its root, this work started from a simple question: is non-Gaussianity fundamentally useful in quantum metrology?
📃 Heisenberg put limits on how well we can jointly *measure* position and momentum. However, these limits do not apply in the framework of estimation theory. In our new work, we show that non-Gaussianity is a crucial resource to increase precision in such estimation.
arxiv.org/abs/2504.01910
arxiv.org/abs/2504.01910
Joint estimation of position and momentum with arbitrarily high precision using non-Gaussian states
We address the joint estimation of changes in the position and linear momentum of a quantum particle or, equivalently, changes in the complex field of a bosonic mode. Although these changes are genera...
arxiv.org
April 3, 2025 at 7:39 AM
📃 Heisenberg put limits on how well we can jointly *measure* position and momentum. However, these limits do not apply in the framework of estimation theory. In our new work, we show that non-Gaussianity is a crucial resource to increase precision in such estimation.
arxiv.org/abs/2504.01910
arxiv.org/abs/2504.01910
Very impressive work!
🚨Je ne pouvais pas le poster un 1er Avril car ceci n'est malheureusement pas une blague : la chasse aux #chercheurs a commencé en France avec le même mode opératoire qu'aux #USA dans les années 2020.
Analyse de la campagne contre #OpenPortability / #HelloQuitteX
➡️ hal.science/hal-05014849
Analyse de la campagne contre #OpenPortability / #HelloQuitteX
➡️ hal.science/hal-05014849
April 2, 2025 at 7:50 PM
Very impressive work!
Reposted by Mattia Walschaers
🔬 @cnrs.fr is recruiting a Junior Professor Chair in Fundamental Physics!
Join Laboratoire Kastler Brossel, LAC, or LPL for an experimental research project in quantum physics.
📌 Duration: 6 years | 📍 Location: Paris
📢 More information:
Join Laboratoire Kastler Brossel, LAC, or LPL for an experimental research project in quantum physics.
📌 Duration: 6 years | 📍 Location: Paris
📢 More information:
Jobs - Laboratoire Kastler Brossel
www.lkb.fr
March 31, 2025 at 9:31 AM
🔬 @cnrs.fr is recruiting a Junior Professor Chair in Fundamental Physics!
Join Laboratoire Kastler Brossel, LAC, or LPL for an experimental research project in quantum physics.
📌 Duration: 6 years | 📍 Location: Paris
📢 More information:
Join Laboratoire Kastler Brossel, LAC, or LPL for an experimental research project in quantum physics.
📌 Duration: 6 years | 📍 Location: Paris
📢 More information: