Matt McEwen
@matt.mcewen.xyz
Research Scientist with Google Quantum AI
Pinned
Matt McEwen
@matt.mcewen.xyz
· Dec 20
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 Matt McEwen
Coming out of social media hibernation to ask:
Are you interested in hosting a future QEC conf?
We are looking for detailed bids for QEC27 over the next month (provisional deadline 21st November). For more info: DM or email me.
QEC26 will be in Santa Barbara
Are you interested in hosting a future QEC conf?
We are looking for detailed bids for QEC27 over the next month (provisional deadline 21st November). For more info: DM or email me.
QEC26 will be in Santa Barbara
October 15, 2025 at 7:44 AM
Coming out of social media hibernation to ask:
Are you interested in hosting a future QEC conf?
We are looking for detailed bids for QEC27 over the next month (provisional deadline 21st November). For more info: DM or email me.
QEC26 will be in Santa Barbara
Are you interested in hosting a future QEC conf?
We are looking for detailed bids for QEC27 over the next month (provisional deadline 21st November). For more info: DM or email me.
QEC26 will be in Santa Barbara
Reposted by Matt McEwen
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...
Reposted by Matt McEwen
For their student researcher-ship, Satoshi Yoshida extended our work on dynamic surface code circuits to color codes. They built and simulated iswap color code circuits and wiggling color code circuits. The iswap circuits use fewer entangling layers than CX circuits!
arxiv.org/abs/2510.00370
arxiv.org/abs/2510.00370
Low Depth Color Code Circuits with CXSWAP gate
We present two new types of syndrome extraction circuits for the color code. Our first construction, which after [M. McEwen, D. Bacon, and C. Gidney, Quantum 7, 1172 (2023)] we call the semi-wiggling ...
arxiv.org
October 2, 2025 at 3:09 AM
For their student researcher-ship, Satoshi Yoshida extended our work on dynamic surface code circuits to color codes. They built and simulated iswap color code circuits and wiggling color code circuits. The iswap circuits use fewer entangling layers than CX circuits!
arxiv.org/abs/2510.00370
arxiv.org/abs/2510.00370
Reposted by Matt McEwen
Reposted by Matt McEwen
Very exciting announcement, the next Quantum Error Correction conference QEC26 will be hosted by Google 7-12 June 2026 in Santa Barbara. See you there! @dripto.bsky.social @mattmcewen.bsky.social
August 12, 2025 at 9:54 PM
Very exciting announcement, the next Quantum Error Correction conference QEC26 will be hosted by Google 7-12 June 2026 in Santa Barbara. See you there! @dripto.bsky.social @mattmcewen.bsky.social
Check out our new work on how to make the surface code on a hexagonal grid robust to dead components: www.arxiv.org/abs/2508.08116
It turns out adding weight-1 checks to LUCI gives you a lot of new freedom!
It turns out adding weight-1 checks to LUCI gives you a lot of new freedom!
Handling fabrication defects in hex-grid surface codes
Recent work has shown that a hexagonal grid qubit layout, with only three couplers per qubit, is sufficient to implement the surface code with performance comparable to that of a traditional four-coup...
www.arxiv.org
August 12, 2025 at 4:16 PM
Check out our new work on how to make the surface code on a hexagonal grid robust to dead components: www.arxiv.org/abs/2508.08116
It turns out adding weight-1 checks to LUCI gives you a lot of new freedom!
It turns out adding weight-1 checks to LUCI gives you a lot of new freedom!
My fav new features are the glorious I_ERROR, II, and II_ERROR instructions. While on their face they seem nuts, they're really helpful for representing operations that stim can't simulate, but can still know are noisy or have 2Q targets. I_ERROR[LEAKAGE](p) anyone?
Just released stim v1.15 (github.com/quantumlib/S...)
Probably the most important change is instructions can now be tagged with arbitrary strings (for custom tools that want to smuggle info into circuits). Also, now all 24 single qubit Clifford rotations have names.
Probably the most important change is instructions can now be tagged with arbitrary strings (for custom tools that want to smuggle info into circuits). Also, now all 24 single qubit Clifford rotations have names.
Release v1.15.0 - Terror of the Tag · quantumlib/Stim
Flagship changes:
Circuit and detector error model instructions can now be tagged with free-form text.
Example use: note the desired hardware implementation of a two qubit gate (CX[adiabatic] 0 1...
github.com
May 8, 2025 at 1:06 AM
My fav new features are the glorious I_ERROR, II, and II_ERROR instructions. While on their face they seem nuts, they're really helpful for representing operations that stim can't simulate, but can still know are noisy or have 2Q targets. I_ERROR[LEAKAGE](p) anyone?
Reposted by Matt McEwen
Submissions for QEC 2025 are now open through March 28.
This will easily be the most exciting conference on quantum error correction yet!
Conference homepage:
qec25.yalepages.org
EasyChair submission page:
easychair.org/my/conferenc...
This will easily be the most exciting conference on quantum error correction yet!
Conference homepage:
qec25.yalepages.org
EasyChair submission page:
easychair.org/my/conferenc...
QEC25
qec25.yalepages.org
January 11, 2025 at 1:23 AM
Submissions for QEC 2025 are now open through March 28.
This will easily be the most exciting conference on quantum error correction yet!
Conference homepage:
qec25.yalepages.org
EasyChair submission page:
easychair.org/my/conferenc...
This will easily be the most exciting conference on quantum error correction yet!
Conference homepage:
qec25.yalepages.org
EasyChair submission page:
easychair.org/my/conferenc...
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 Matt McEwen
🌳 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...