laura cui
@reionize.bsky.social
phd student @ caltech | interested in quantum info, math education, watercolors, marine bio
https://reionize.github.io
https://reionize.github.io
Pinned
laura cui
@reionize.bsky.social
· Oct 10
When can we use random unitaries to (efficiently) model physical dynamics? 💻 ⚛️
Excited to share a couple of works with Liang Mao, Fernando Brandão, Robert Huang, Thomas Schuster in which we explore this question!
[1] arxiv.org/abs/2510.08448
[2] arxiv.org/abs/2510.08434
1/8
Excited to share a couple of works with Liang Mao, Fernando Brandão, Robert Huang, Thomas Schuster in which we explore this question!
[1] arxiv.org/abs/2510.08448
[2] arxiv.org/abs/2510.08434
1/8
Reposted by laura cui
Oil is the most Lovecraftian thing that actually exists.
You're telling me that there's a black ichor under the earth made from the ancient dead, whose burning can realize all the dreams of man, but only at the price of slowly returning the earth to its primordial state?
You're telling me that there's a black ichor under the earth made from the ancient dead, whose burning can realize all the dreams of man, but only at the price of slowly returning the earth to its primordial state?
November 6, 2025 at 9:38 PM
Oil is the most Lovecraftian thing that actually exists.
You're telling me that there's a black ichor under the earth made from the ancient dead, whose burning can realize all the dreams of man, but only at the price of slowly returning the earth to its primordial state?
You're telling me that there's a black ichor under the earth made from the ancient dead, whose burning can realize all the dreams of man, but only at the price of slowly returning the earth to its primordial state?
Reposted by laura cui
People take for granted the fact that mangos are so delicious, but most don’t know that every logical mango is made out of many physical mangos.
October 30, 2025 at 6:52 AM
People take for granted the fact that mangos are so delicious, but most don’t know that every logical mango is made out of many physical mangos.
Reposted by laura cui
Are you a computer scientist and don't know what an OTOC is, but want to understand the problem solved in the recent Nature paper by Google Quantum AI? We wrote a 2-page note that explains the motivation and presents a simplified version of the problem for any input size.
scirate.com/arxiv/2510.1...
scirate.com/arxiv/2510.1...
October 23, 2025 at 2:58 AM
Are you a computer scientist and don't know what an OTOC is, but want to understand the problem solved in the recent Nature paper by Google Quantum AI? We wrote a 2-page note that explains the motivation and presents a simplified version of the problem for any input size.
scirate.com/arxiv/2510.1...
scirate.com/arxiv/2510.1...
Reposted by laura cui
This is what courage in the face of authoritarianism looks like. No university should take Trump's bribe & surrender their integrity — bending the knee to a bully only feeds the beast & puts ALL our rights at risk.
Others should follows MIT’s example ASAP.
Others should follows MIT’s example ASAP.
MIT rejects Trump administration deal for priority federal funding
MIT is one of the nine schools that were asked to agree to adopt conservative priorities and policies in exchange for funding perks.
www.washingtonpost.com
October 10, 2025 at 5:22 PM
This is what courage in the face of authoritarianism looks like. No university should take Trump's bribe & surrender their integrity — bending the knee to a bully only feeds the beast & puts ALL our rights at risk.
Others should follows MIT’s example ASAP.
Others should follows MIT’s example ASAP.
When can we use random unitaries to (efficiently) model physical dynamics? 💻 ⚛️
Excited to share a couple of works with Liang Mao, Fernando Brandão, Robert Huang, Thomas Schuster in which we explore this question!
[1] arxiv.org/abs/2510.08448
[2] arxiv.org/abs/2510.08434
1/8
Excited to share a couple of works with Liang Mao, Fernando Brandão, Robert Huang, Thomas Schuster in which we explore this question!
[1] arxiv.org/abs/2510.08448
[2] arxiv.org/abs/2510.08434
1/8
October 10, 2025 at 2:11 AM
When can we use random unitaries to (efficiently) model physical dynamics? 💻 ⚛️
Excited to share a couple of works with Liang Mao, Fernando Brandão, Robert Huang, Thomas Schuster in which we explore this question!
[1] arxiv.org/abs/2510.08448
[2] arxiv.org/abs/2510.08434
1/8
Excited to share a couple of works with Liang Mao, Fernando Brandão, Robert Huang, Thomas Schuster in which we explore this question!
[1] arxiv.org/abs/2510.08448
[2] arxiv.org/abs/2510.08434
1/8
Reposted by laura cui
I've complained a couple times about the lack of physics community here but not done much about it! New commitment: I'll post one interesting arXiv paper a day until things are better.
(To the folks who follow me for non-physics science policy, don't worry; plenty more of that reporting to come.)
(To the folks who follow me for non-physics science policy, don't worry; plenty more of that reporting to come.)
September 8, 2025 at 4:09 PM
I've complained a couple times about the lack of physics community here but not done much about it! New commitment: I'll post one interesting arXiv paper a day until things are better.
(To the folks who follow me for non-physics science policy, don't worry; plenty more of that reporting to come.)
(To the folks who follow me for non-physics science policy, don't worry; plenty more of that reporting to come.)
Reposted by laura cui
The Ginsburg Center for Quantum Precision Measurement @caltech.edu now stands 4 stories high. Opens summer 2026.
August 28, 2025 at 11:52 PM
The Ginsburg Center for Quantum Precision Measurement @caltech.edu now stands 4 stories high. Opens summer 2026.
counterpoint: it's fun when academics refuse to write a paper so you see everyone cite a blog post or youtube video instead
It's fun when academics write blog posts as papers:
- dl.acm.org/doi/10.1145/... (Why haven't more quantum algorithms been found?)
- arxiv.org/abs/2412.18726 (Opinion: The simplest quantum computer)
- arxiv.org/abs/quant-ph... (Sundays in a Quantum Engineer's Life)
any other good ones in quantum?
- dl.acm.org/doi/10.1145/... (Why haven't more quantum algorithms been found?)
- arxiv.org/abs/2412.18726 (Opinion: The simplest quantum computer)
- arxiv.org/abs/quant-ph... (Sundays in a Quantum Engineer's Life)
any other good ones in quantum?
August 27, 2025 at 9:55 PM
counterpoint: it's fun when academics refuse to write a paper so you see everyone cite a blog post or youtube video instead
Reposted by laura cui
How fast can (pseudo)random unitaries be implemented on a quantum computer? O(1) time suffices (provided you can do things like intermediate measurements)! This -and more- is thanks to a superfun collaboration with Ben Foxman, @nat-parham.bsky.social, and @franvasco.bsky.social (all PhD students!).
In exciting new work with Ben Foxman, @nat-parham.bsky.social , and @henryyuen.bsky.social we show that t-designs and pseudorandom unitaries are implementable in constant (quantum) time!
arxiv.org/abs/2508.11487
arxiv.org/abs/2508.11487
Random Unitaries in Constant (Quantum) Time
Random unitaries are a central object of study in quantum information, with applications to quantum computation, quantum many-body physics, and quantum cryptography. Recent work has constructed unitar...
arxiv.org
August 19, 2025 at 12:54 AM
How fast can (pseudo)random unitaries be implemented on a quantum computer? O(1) time suffices (provided you can do things like intermediate measurements)! This -and more- is thanks to a superfun collaboration with Ben Foxman, @nat-parham.bsky.social, and @franvasco.bsky.social (all PhD students!).
Reposted by laura cui
Reposted by laura cui
In exciting new work with Ben Foxman, @nat-parham.bsky.social , and @henryyuen.bsky.social we show that t-designs and pseudorandom unitaries are implementable in constant (quantum) time!
arxiv.org/abs/2508.11487
arxiv.org/abs/2508.11487
Random Unitaries in Constant (Quantum) Time
Random unitaries are a central object of study in quantum information, with applications to quantum computation, quantum many-body physics, and quantum cryptography. Recent work has constructed unitar...
arxiv.org
August 19, 2025 at 12:22 AM
In exciting new work with Ben Foxman, @nat-parham.bsky.social , and @henryyuen.bsky.social we show that t-designs and pseudorandom unitaries are implementable in constant (quantum) time!
arxiv.org/abs/2508.11487
arxiv.org/abs/2508.11487
video & comments make some very sharp points ("quantum computers are to classical computers what planes are to cars" @ f5673-t1h)
... but I'm actually more amazed by what she said about modern solar panels 🤯 25% efficiency for commercially available panels in 2025 is crazy
... but I'm actually more amazed by what she said about modern solar panels 🤯 25% efficiency for commercially available panels in 2025 is crazy
"I left quantum computing after finishing a PhD from Cambridge University. I loved being a researcher but I became a little bit concerned that maybe quantum computers aren't gonna be as useful in the real world as we might have hoped."
www.youtube.com/watch?v=pDj1...
www.youtube.com/watch?v=pDj1...
Why I Left Quantum Computing Research
YouTube video by Looking Glass Universe
www.youtube.com
July 14, 2025 at 6:07 PM
video & comments make some very sharp points ("quantum computers are to classical computers what planes are to cars" @ f5673-t1h)
... but I'm actually more amazed by what she said about modern solar panels 🤯 25% efficiency for commercially available panels in 2025 is crazy
... but I'm actually more amazed by what she said about modern solar panels 🤯 25% efficiency for commercially available panels in 2025 is crazy
Reposted by laura cui
One more day, one more chance to pretend that I understand the word "topological"
July 11, 2025 at 11:40 AM
One more day, one more chance to pretend that I understand the word "topological"
What is the min depth you need for a random unitary?
In this work w/ Tommy Schuster, @RobertHuangHY, Fernando Brandão (arxiv.org/abs/2507.06216) we glue random unitary blocks w/ only random phases on log n qubits (fns on log n bits) to get designs in d = log k log log n 🧩
1/8
In this work w/ Tommy Schuster, @RobertHuangHY, Fernando Brandão (arxiv.org/abs/2507.06216) we glue random unitary blocks w/ only random phases on log n qubits (fns on log n bits) to get designs in d = log k log log n 🧩
1/8
July 9, 2025 at 4:13 AM
What is the min depth you need for a random unitary?
In this work w/ Tommy Schuster, @RobertHuangHY, Fernando Brandão (arxiv.org/abs/2507.06216) we glue random unitary blocks w/ only random phases on log n qubits (fns on log n bits) to get designs in d = log k log log n 🧩
1/8
In this work w/ Tommy Schuster, @RobertHuangHY, Fernando Brandão (arxiv.org/abs/2507.06216) we glue random unitary blocks w/ only random phases on log n qubits (fns on log n bits) to get designs in d = log k log log n 🧩
1/8
Reposted by laura cui
We report that there is something corrosive about this sunrise; acidic orange clouds, biting winds, the light eating houses one after the other. The back wall of our kitchen is about to be swallowed too, all bright and golden. We have to admit that we are not much for mornings.
February 26, 2025 at 12:32 AM
We report that there is something corrosive about this sunrise; acidic orange clouds, biting winds, the light eating houses one after the other. The back wall of our kitchen is about to be swallowed too, all bright and golden. We have to admit that we are not much for mornings.
Reposted by laura cui
Not Bullshit
Damn quantum physicists. 😖
November 21, 2024 at 11:58 PM
Not Bullshit