Max Schaefer
@schaefermax.bsky.social
Graduate Student Researcher @ Devoret lab | Returning Student Researcher @ Google Quantum AI | Visiting Researcher @ Painter Lab
Thrilled to see my PhD supervisor Michel Devoret win the 2025 Nobel Prize in Physics — so well deserved for a visionary scientist and inspiring mentor. His pioneering work made much of today’s superconducting-circuit quantum research possible.
#Quantum #NobelPrize
#Quantum #NobelPrize
Clarke, Devoret and Martinis win 2025 Nobel Prize in Physics reut.rs/3KHTfTs
Clarke, Devoret and Martinis win 2025 Nobel Prize in Physics
Scientists John Clarke, Michel Devoret and John Martinis won the 2025 Nobel Prize in Physics for "the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit", the award-giving body said on Tuesday.
reut.rs
October 8, 2025 at 3:43 AM
Thrilled to see my PhD supervisor Michel Devoret win the 2025 Nobel Prize in Physics — so well deserved for a visionary scientist and inspiring mentor. His pioneering work made much of today’s superconducting-circuit quantum research possible.
#Quantum #NobelPrize
#Quantum #NobelPrize
Reposted by Max Schaefer
Clarke, Devoret and Martinis win 2025 Nobel Prize in Physics reut.rs/3KHTfTs
Clarke, Devoret and Martinis win 2025 Nobel Prize in Physics
Scientists John Clarke, Michel Devoret and John Martinis won the 2025 Nobel Prize in Physics for "the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit", the award-giving body said on Tuesday.
reut.rs
October 7, 2025 at 10:05 AM
Clarke, Devoret and Martinis win 2025 Nobel Prize in Physics reut.rs/3KHTfTs
Reposted by Max Schaefer
Heekun Nho, Thomas Connolly, Pavel D. Kurilovich, Spencer Diamond, Charlotte G. L. B{\o}ttcher, Leonid I. Glazman, Michel H. Devoret
Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
https://arxiv.org/abs/2505.08104
Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
https://arxiv.org/abs/2505.08104
May 14, 2025 at 7:38 AM
Heekun Nho, Thomas Connolly, Pavel D. Kurilovich, Spencer Diamond, Charlotte G. L. B{\o}ttcher, Leonid I. Glazman, Michel H. Devoret
Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
https://arxiv.org/abs/2505.08104
Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
https://arxiv.org/abs/2505.08104
Had a great time at #APSGlobalSummit! Discussed unexpected resonances and sudden lifetime drops at high photon numbers in #KerrCat qubits. We ran experiments to explore the cause, and there's much to learn. Check out our findings here: arxiv.org/abs/2409.13113. Would love to hear your insights!
March 25, 2025 at 6:36 AM
Had a great time at #APSGlobalSummit! Discussed unexpected resonances and sudden lifetime drops at high photon numbers in #KerrCat qubits. We ran experiments to explore the cause, and there's much to learn. Check out our findings here: arxiv.org/abs/2409.13113. Would love to hear your insights!
Excited to share our latest work at #APSGlobalSummit! I’ll be presenting on tunneling in a tunable asymmetric double-well Kerr parametric oscillator and its role in simulating proton tunneling in chemical reactions. Catch my talk (MAR-C33) Mon, Mar 17, 5:48–6:00 PM, Anaheim CC, Room 253C! #APS2025
March 16, 2025 at 3:10 AM
Excited to share our latest work at #APSGlobalSummit! I’ll be presenting on tunneling in a tunable asymmetric double-well Kerr parametric oscillator and its role in simulating proton tunneling in chemical reactions. Catch my talk (MAR-C33) Mon, Mar 17, 5:48–6:00 PM, Anaheim CC, Room 253C! #APS2025
Reposted by Max Schaefer
Jakob G\"unther, Freek Witteveen, Alexander Schmidhuber, Marek Miller, Matthias Christandl, Aram Harrow
Phase estimation with partially randomized time evolution
https://arxiv.org/abs/2503.05647
Phase estimation with partially randomized time evolution
https://arxiv.org/abs/2503.05647
March 10, 2025 at 4:37 AM
Jakob G\"unther, Freek Witteveen, Alexander Schmidhuber, Marek Miller, Matthias Christandl, Aram Harrow
Phase estimation with partially randomized time evolution
https://arxiv.org/abs/2503.05647
Phase estimation with partially randomized time evolution
https://arxiv.org/abs/2503.05647
Reposted by Max Schaefer
Nam P. Vu, Daniel Dong, Xiaohan Dan, Ningyi Lyu, Victor Batista, Yuan Liu
A Computational Framework for Simulations of Dissipative Non-Adiabatic Dynamics on Hybrid Oscillator-Qubit Quantum Devices
https://arxiv.org/abs/2502.17820
A Computational Framework for Simulations of Dissipative Non-Adiabatic Dynamics on Hybrid Oscillator-Qubit Quantum Devices
https://arxiv.org/abs/2502.17820
February 26, 2025 at 7:40 AM
Nam P. Vu, Daniel Dong, Xiaohan Dan, Ningyi Lyu, Victor Batista, Yuan Liu
A Computational Framework for Simulations of Dissipative Non-Adiabatic Dynamics on Hybrid Oscillator-Qubit Quantum Devices
https://arxiv.org/abs/2502.17820
A Computational Framework for Simulations of Dissipative Non-Adiabatic Dynamics on Hybrid Oscillator-Qubit Quantum Devices
https://arxiv.org/abs/2502.17820
Reposted by Max Schaefer
Aniket Maiti, John W. O. Garmon, Yao Lu, Alessandro Miano, Luigi Frunzio, Robert J. Schoelkopf
A Linear Quantum Coupler for Clean Bosonic Control
https://arxiv.org/abs/2501.18025
A Linear Quantum Coupler for Clean Bosonic Control
https://arxiv.org/abs/2501.18025
January 31, 2025 at 7:51 AM
Aniket Maiti, John W. O. Garmon, Yao Lu, Alessandro Miano, Luigi Frunzio, Robert J. Schoelkopf
A Linear Quantum Coupler for Clean Bosonic Control
https://arxiv.org/abs/2501.18025
A Linear Quantum Coupler for Clean Bosonic Control
https://arxiv.org/abs/2501.18025
Reposted by Max Schaefer
Happy to share our work with @anthony-leverrier.bsky.social, @christophe.vuillot.info, Jérémie Guillaud and Mazyar Mirrahimi on the LDPC-cat architecture was published in Nature Communications! Thanks to the reviewers for their useful feedback
www.nature.com/articles/s41...
www.nature.com/articles/s41...
LDPC-cat codes for low-overhead quantum computing in 2D - Nature Communications
Implementing full quantum error correction incurs a significant hardware overhead. Here, the authors propose a quantum computing architecture combining superconducting cat qubits with 2D local LDPC co...
www.nature.com
January 29, 2025 at 6:57 PM
Happy to share our work with @anthony-leverrier.bsky.social, @christophe.vuillot.info, Jérémie Guillaud and Mazyar Mirrahimi on the LDPC-cat architecture was published in Nature Communications! Thanks to the reviewers for their useful feedback
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Check out this paper by my friends and colleagues achieving an order of magnitude improvement in the QNDness of transmon readout
Pavel D. Kurilovich, Thomas Connolly, Charlotte G. L. B{\o}ttcher, Daniel K. Weiss, Sumeru Hazra, Vidul R. Joshi, Andy Z. Ding, Heekun Nho, Spencer Diamond, Vladislav D. Kurilovich, ...
High-frequency readout free from transmon multi-excitation resonances
https://arxiv.org/abs/2501.09161
High-frequency readout free from transmon multi-excitation resonances
https://arxiv.org/abs/2501.09161
January 17, 2025 at 9:28 PM
Check out this paper by my friends and colleagues achieving an order of magnitude improvement in the QNDness of transmon readout
Check out this interesting theory paper on switching rates in the asymmetric/biased Kerr Parametric Oscillator
Daniel K. J. Bone{\ss}, Mark I. Dykman, Wolfgang Belzig
Zero-temperature phase-flip rate in a biased parametric oscillator
https://arxiv.org/abs/2501.07562
Zero-temperature phase-flip rate in a biased parametric oscillator
https://arxiv.org/abs/2501.07562
January 16, 2025 at 6:57 AM
Check out this interesting theory paper on switching rates in the asymmetric/biased Kerr Parametric Oscillator
My colleague's new work: a general method for the normal-ordered Hamiltonian expansion of arbitrary single-DOF potentials, yielding exact coefficients for driven Josephson circuits. This is crucial to analyze strongly driven systems like the Cat qubits. Check it out: arxiv.org/abs/2501.07784
Exact amplitudes of parametric processes in driven Josephson circuits
We present a general approach for analyzing arbitrary parametric processes in Josephson circuits within a single degree of freedom approximation. Introducing a systematic normal-ordered expansion for ...
arxiv.org
January 16, 2025 at 3:25 AM
My colleague's new work: a general method for the normal-ordered Hamiltonian expansion of arbitrary single-DOF potentials, yielding exact coefficients for driven Josephson circuits. This is crucial to analyze strongly driven systems like the Cat qubits. Check it out: arxiv.org/abs/2501.07784
Reposted by Max Schaefer
Great set of Paul Bernays lectures by Michel Devoret at @ethzurich.bsky.social this week.
You will be able to listen to the recorded lectures soon by following this link: math.ethz.ch/news-and-eve... .
It was great to discuss with Michel and show him around at the labs.
Thanks for the visit!
You will be able to listen to the recorded lectures soon by following this link: math.ethz.ch/news-and-eve... .
It was great to discuss with Michel and show him around at the labs.
Thanks for the visit!
December 21, 2024 at 7:43 PM
Great set of Paul Bernays lectures by Michel Devoret at @ethzurich.bsky.social this week.
You will be able to listen to the recorded lectures soon by following this link: math.ethz.ch/news-and-eve... .
It was great to discuss with Michel and show him around at the labs.
Thanks for the visit!
You will be able to listen to the recorded lectures soon by following this link: math.ethz.ch/news-and-eve... .
It was great to discuss with Michel and show him around at the labs.
Thanks for the visit!
Check out this exciting paper about the Kerr-cat qubit from my friends and colleagues!
Qile Su, Rodrigo G. Corti\~nas, Jayameenakshi Venkatraman, Shruti Puri
Unraveling the switching dynamics in a quantum double-well potential
https://arxiv.org/abs/2501.00209
Unraveling the switching dynamics in a quantum double-well potential
https://arxiv.org/abs/2501.00209
January 10, 2025 at 4:53 AM
Check out this exciting paper about the Kerr-cat qubit from my friends and colleagues!
Reposted by Max Schaefer
Check out our new Quantum Device Lab (qudev.ethz.ch) paper on entangling #quantum error corrected logical qubits in superconducting circuits "Realizing Lattice Surgery on Two Distance-Three Repetition Codes with Superconducting Qubits" published on arXiv today ( arxiv.org/abs/2501.04612 ).
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January 9, 2025 at 5:44 PM
Check out our new Quantum Device Lab (qudev.ethz.ch) paper on entangling #quantum error corrected logical qubits in superconducting circuits "Realizing Lattice Surgery on Two Distance-Three Repetition Codes with Superconducting Qubits" published on arXiv today ( arxiv.org/abs/2501.04612 ).
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Reposted by Max Schaefer
Circuits Galore! Check out our latest work demonstrating three new circuits for implementing the surface code: arxiv.org/abs/2412.14360 They all perform well below threshold on a device optimised for the standard surface code, but they each open up wild new possibilities for devices.
December 20, 2024 at 9:43 AM
Circuits Galore! Check out our latest work demonstrating three new circuits for implementing the surface code: arxiv.org/abs/2412.14360 They all perform well below threshold on a device optimised for the standard surface code, but they each open up wild new possibilities for devices.
Reposted by Max Schaefer
Over the past year I played a supporting role on experiments showing we have a flexibility in how we do QEC on a planar chip. We do a color code (arxiv.org/abs/2412.14256), and three interesting variations of the surface code circuit (arxiv.org/abs/2412.14360), all below threshold.
December 20, 2024 at 4:10 AM
Over the past year I played a supporting role on experiments showing we have a flexibility in how we do QEC on a planar chip. We do a color code (arxiv.org/abs/2412.14256), and three interesting variations of the surface code circuit (arxiv.org/abs/2412.14360), all below threshold.
Reposted by Max Schaefer
Mark your calendars!
The second big lecture series of the term on #quantum #science and #technology at @ethzurich.bsky.social will be given by one of the pioneers of mesoscopic physics and superconducting quantum circuits Michel Devoret.
- math.ethz.ch/news-and-eve...
Hope to see you there.
The second big lecture series of the term on #quantum #science and #technology at @ethzurich.bsky.social will be given by one of the pioneers of mesoscopic physics and superconducting quantum circuits Michel Devoret.
- math.ethz.ch/news-and-eve...
Hope to see you there.
December 6, 2024 at 6:48 PM
Mark your calendars!
The second big lecture series of the term on #quantum #science and #technology at @ethzurich.bsky.social will be given by one of the pioneers of mesoscopic physics and superconducting quantum circuits Michel Devoret.
- math.ethz.ch/news-and-eve...
Hope to see you there.
The second big lecture series of the term on #quantum #science and #technology at @ethzurich.bsky.social will be given by one of the pioneers of mesoscopic physics and superconducting quantum circuits Michel Devoret.
- math.ethz.ch/news-and-eve...
Hope to see you there.
Reposted by Max Schaefer
🌳 Excited to introduce Willow, Google Quantum AI’s latest chip. Willow 5x’s coherence times, beats the Surface Code QEC threshold, and the time to reproduce Willow's RCS on Frontier supercomputer is estimated at 10^25 years⏳! 👇 thread #Quantum #Physics #Science
blog.google/technology/r...
blog.google/technology/r...
Meet Willow, our state-of-the-art quantum chip
Our new quantum chip demonstrates error correction and performance that paves the way to a useful, large-scale quantum computer.
blog.google
December 9, 2024 at 4:38 PM
🌳 Excited to introduce Willow, Google Quantum AI’s latest chip. Willow 5x’s coherence times, beats the Surface Code QEC threshold, and the time to reproduce Willow's RCS on Frontier supercomputer is estimated at 10^25 years⏳! 👇 thread #Quantum #Physics #Science
blog.google/technology/r...
blog.google/technology/r...
Thrilled to share our paper, "A Roadmap for Simulating Chemical Dynamics on a Parametrically Driven Bosonic Quantum Device," in The Journal of Physical Chemistry Letters! We explore Kerr-cat devices for simulating proton transfer, including in DNA base pairs. Read here: pubs.acs.org/doi/abs/10.1...
A Roadmap for Simulating Chemical Dynamics on a Parametrically Driven Bosonic Quantum Device
Chemical reactions are commonly described by the reactive flux transferring the population from reactants to products across a double-well free energy barrier. Dynamics often involves barrier recrossi...
pubs.acs.org
December 3, 2024 at 9:00 AM
Thrilled to share our paper, "A Roadmap for Simulating Chemical Dynamics on a Parametrically Driven Bosonic Quantum Device," in The Journal of Physical Chemistry Letters! We explore Kerr-cat devices for simulating proton transfer, including in DNA base pairs. Read here: pubs.acs.org/doi/abs/10.1...