Declan Millar
@declanmillar.bsky.social
Quantum algorithms researcher & theoretical physicist. https://millar.phd
Reposted by Declan Millar
There are lots of ways to find ground states of many-body quantum systems, but what do you do if you want to prepare an excited state? 🤔
That's the question we've addressed in a new preprint, out today: arxiv.org/abs/2508.00065
That's the question we've addressed in a new preprint, out today: arxiv.org/abs/2508.00065
August 4, 2025 at 10:44 AM
There are lots of ways to find ground states of many-body quantum systems, but what do you do if you want to prepare an excited state? 🤔
That's the question we've addressed in a new preprint, out today: arxiv.org/abs/2508.00065
That's the question we've addressed in a new preprint, out today: arxiv.org/abs/2508.00065
Reposted by Declan Millar
One-meme summary of Microsoft's announcement today.
February 19, 2025 at 6:28 PM
One-meme summary of Microsoft's announcement today.
Reposted by Declan Millar
The "hide the exponential" game Scott Aaronson has complained about for decades is alive and well: arxiv.org/abs/2412.13164
Yes, Shor's algorithm with 3 registers only needs very basic operations.
No, you can't pack a 2^2000 level quantum state into 1 oscillator and then operate accurately on it.
Yes, Shor's algorithm with 3 registers only needs very basic operations.
No, you can't pack a 2^2000 level quantum state into 1 oscillator and then operate accurately on it.
Factoring an integer with three oscillators and a qubit
A common starting point of traditional quantum algorithm design is the notion of a universal quantum computer with a scalable number of qubits. This convenient abstraction mirrors classical computatio...
arxiv.org
December 19, 2024 at 2:07 AM
The "hide the exponential" game Scott Aaronson has complained about for decades is alive and well: arxiv.org/abs/2412.13164
Yes, Shor's algorithm with 3 registers only needs very basic operations.
No, you can't pack a 2^2000 level quantum state into 1 oscillator and then operate accurately on it.
Yes, Shor's algorithm with 3 registers only needs very basic operations.
No, you can't pack a 2^2000 level quantum state into 1 oscillator and then operate accurately on it.
Reposted by Declan Millar
In summary: nice try, but I wouldn't say that Grover's algorithm is "particularly promising for applications in disease research" and that this slight adaption of it is "signaling significant impact in both the fields of computational biology and quantum computing".
November 30, 2024 at 12:10 PM
In summary: nice try, but I wouldn't say that Grover's algorithm is "particularly promising for applications in disease research" and that this slight adaption of it is "signaling significant impact in both the fields of computational biology and quantum computing".
Reposted by Declan Millar
"A new quantum algorithm [...] addresses one of the most complex challenges in single-cell analysis, signaling significant impact in both the fields of computational biology and quantum computing."
Sounds exciting - let's have a look! 🧵
phys.org/news/2024-11...
Sounds exciting - let's have a look! 🧵
phys.org/news/2024-11...
Novel quantum computing algorithm enhances single-cell analysis
A new quantum algorithm developed by University of Georgia statisticians addresses one of the most complex challenges in single-cell analysis, signaling significant impact in both the fields of comput...
phys.org
November 30, 2024 at 12:10 PM
"A new quantum algorithm [...] addresses one of the most complex challenges in single-cell analysis, signaling significant impact in both the fields of computational biology and quantum computing."
Sounds exciting - let's have a look! 🧵
phys.org/news/2024-11...
Sounds exciting - let's have a look! 🧵
phys.org/news/2024-11...
Reposted by Declan Millar
Here we go! I'm advertising two PhD projects in the School of Physics & Astronomy!
One is all about developing new ways to model open quantum systems: www.ph.ed.ac.uk/phd-projects...
The other is about disorder and many-body localisation: www.ph.ed.ac.uk/phd-projects...
Just ask for more info!
One is all about developing new ways to model open quantum systems: www.ph.ed.ac.uk/phd-projects...
The other is about disorder and many-body localisation: www.ph.ed.ac.uk/phd-projects...
Just ask for more info!
Non-equilibrium Dynamics of Open Quantum Systems
www.ph.ed.ac.uk
November 22, 2024 at 3:53 PM
Here we go! I'm advertising two PhD projects in the School of Physics & Astronomy!
One is all about developing new ways to model open quantum systems: www.ph.ed.ac.uk/phd-projects...
The other is about disorder and many-body localisation: www.ph.ed.ac.uk/phd-projects...
Just ask for more info!
One is all about developing new ways to model open quantum systems: www.ph.ed.ac.uk/phd-projects...
The other is about disorder and many-body localisation: www.ph.ed.ac.uk/phd-projects...
Just ask for more info!
Reposted by Declan Millar
Unravelling quantum dynamics using flow equations.
www.nature.com/articles/s41...
Combining flow equations with scrambling techniques and error bounds, we present a new way to address the classical simulation of quantum dynamics for intermediate times.
www.nature.com/articles/s41...
Combining flow equations with scrambling techniques and error bounds, we present a new way to address the classical simulation of quantum dynamics for intermediate times.
Unravelling quantum dynamics using flow equations - Nature Physics
The complexity of a many-body quantum state grows exponentially with system size, hindering numerical studies. A unitary flow-based method now enables accurate estimates of long-term properties of one...
www.nature.com
August 29, 2024 at 7:31 AM
Unravelling quantum dynamics using flow equations.
www.nature.com/articles/s41...
Combining flow equations with scrambling techniques and error bounds, we present a new way to address the classical simulation of quantum dynamics for intermediate times.
www.nature.com/articles/s41...
Combining flow equations with scrambling techniques and error bounds, we present a new way to address the classical simulation of quantum dynamics for intermediate times.
Reposted by Declan Millar
I'm glad I haven't been forgotten by my IBM colleagues. 😅
I’m not sure where the speakers are, but it’s a very effective deterrent.
November 20, 2024 at 5:36 PM
I'm glad I haven't been forgotten by my IBM colleagues. 😅
Physics is to natural science as economics is to the humanities. Maths is a useful tool for both.
November 20, 2024 at 7:59 AM
Physics is to natural science as economics is to the humanities. Maths is a useful tool for both.
Reposted by Declan Millar
I've been thinking a bit about this whole "echo chamber" thing on social media. It's not the opposing ideas that are driving people away from Twitter; I'm surrounded by folks who don't believe the same things I do. It's the absolutely repugnant people, their style of engagement and entitlement.
November 18, 2024 at 2:17 PM
I've been thinking a bit about this whole "echo chamber" thing on social media. It's not the opposing ideas that are driving people away from Twitter; I'm surrounded by folks who don't believe the same things I do. It's the absolutely repugnant people, their style of engagement and entitlement.
Reposted by Declan Millar
📢PhD Positions in Quantum Computing
Applications are now open for the new CDT in Quantum Informatics. We are recruiting 16 students to start Sept 2025. Positions are fully funded for 4 years. Apply now:
quantuminformatics-cdt.ac.uk
Applications are now open for the new CDT in Quantum Informatics. We are recruiting 16 students to start Sept 2025. Positions are fully funded for 4 years. Apply now:
quantuminformatics-cdt.ac.uk
QI CDT – EPSRC Centre for Doctoral Training in Quantum Informatics
quantuminformatics-cdt.ac.uk
November 20, 2024 at 6:10 PM
📢PhD Positions in Quantum Computing
Applications are now open for the new CDT in Quantum Informatics. We are recruiting 16 students to start Sept 2025. Positions are fully funded for 4 years. Apply now:
quantuminformatics-cdt.ac.uk
Applications are now open for the new CDT in Quantum Informatics. We are recruiting 16 students to start Sept 2025. Positions are fully funded for 4 years. Apply now:
quantuminformatics-cdt.ac.uk
I stumbled upon this post by @francescoppola.bsky.social during my lunchtime web meanderings. I think it’s an interesting and timely read.
www.coppolacomment.com/2012/07/the-...
www.coppolacomment.com/2012/07/the-...
The necessary arrogance of elites
www.coppolacomment.com
November 18, 2024 at 1:26 PM
I stumbled upon this post by @francescoppola.bsky.social during my lunchtime web meanderings. I think it’s an interesting and timely read.
www.coppolacomment.com/2012/07/the-...
www.coppolacomment.com/2012/07/the-...
Reposted by Declan Millar
I tried to write up an intro to (dynamical) Lie algebras for quantum practicioners as the topic keeps poping up
pennylane.ai/qml/demos/tu...
pennylane.ai/qml/demos/tu...
Introducing (Dynamical) Lie Algebras for quantum practitioners | PennyLane Demos
A gentle introduction to Lie theory covering the basics of Lie algebras and Lie groups in the context of quantum computing.
pennylane.ai
November 18, 2024 at 9:40 AM
I tried to write up an intro to (dynamical) Lie algebras for quantum practicioners as the topic keeps poping up
pennylane.ai/qml/demos/tu...
pennylane.ai/qml/demos/tu...
I am a research scientist developing algorithms for simulating physical systems on quantum hardware.
I think for a living. Occasionally, I write something down.
I think for a living. Occasionally, I write something down.
November 16, 2024 at 7:16 PM
I am a research scientist developing algorithms for simulating physical systems on quantum hardware.
I think for a living. Occasionally, I write something down.
I think for a living. Occasionally, I write something down.
“I am whatever the people need me to be. A guardian. An oppressor. For some, too distant. For others, too meddlesome. I am the canvas upon which they paint their dreams and resentments. A vessel for their hopes and doubts. A mirror. Nothing more.”
- Sotha Sil, The Clockwork City, 2E 582
- Sotha Sil, The Clockwork City, 2E 582
November 16, 2024 at 6:51 PM
“I am whatever the people need me to be. A guardian. An oppressor. For some, too distant. For others, too meddlesome. I am the canvas upon which they paint their dreams and resentments. A vessel for their hopes and doubts. A mirror. Nothing more.”
- Sotha Sil, The Clockwork City, 2E 582
- Sotha Sil, The Clockwork City, 2E 582