Quantum Hardware Nerd

IC postdoc fellowship opportunity on defect engineering for superconducting qubits:
www.zintellect.com/Opportunity/...

If I had to pick a favorite paper of the year, this would be among the top.

arxiv.org/pdf/2407.07694

Laserless single (99.99916) and two-qubit (99.97) gates. They bring a new paradigm for a platform that’s been going strong for 20+ years

(Also enjoy the integrated form factor)

#quantum

YouTube video by QTML Conference Learning shallow quantum circuits with many-qubit gates - Francisca Vasconcelos

At QTML 2024, I spoke about recent work with Robert Huang on "Learning shallow quantum circuits with many-qubit gates" (a.k.a. efficient learning of QAC^0 unitaries). In this ~15min talk I discuss the project motivation, key results, and high-level proof ideas.

www.youtube.com/watch?v=iRiJ...

Super bizarre folks.

It's funny that the Dwave CEO is his own stock troll.

This is my favourite workday of the year (better even than Nobel Prize in Physics announcement day!), because it's the day when my colleagues and I @physicsworld.bsky.social announce our selection of the year's most important advances in physics. 🧪⚛️🔭 #quantum

🧵1/n

Pure gold

Omg I came across that thread just now

The thing I've noticed about quantum press releases is at the core there is usually a solid advance.

Unfortunately it gets butchered and hyped.

E.g. Nvidia and Google's recent releases.

I’m holding space for Google

Tech bros on Twitter be like:

I spent 2 minutes reading a press release on Google's paper about their quantum computer so you don't have to.

They claim to have .... blah blah...

But what is quantum computation?
Does it live up to the hype?

I, the expert, will break it down

Google's new hardware looks great and I'd be excited to try it out. But I seem to be even more interested in its limitations: Their repetition code results show an error floor at around 10^-10.

What physics is lurking down there? Can we tame it?

Is Google's new quantum computer a big deal? Google has unveiled a new quantum computer that excels at a benchmarking problem, but it still isn't clear whether these machines can serve a practical purpose

Google's new quantum computing chip Willow holds lots of promise and its error correction capability is a signature result. But the benchmark Google are using for its performance is, as their team told me, still an "IOU" for more practical calculations www.newscientist.com/article/2459...

YouTube video by PsiQuantum Pete Shadbolt at MIT EmTech: Building the World’s First Useful Quantum Computer

Here’s Pete Shadbolt’s presentation at MIT Technology Review’s EmTech Summit, showing work that the company is doing to overcome hard technical challenges from the nanometer to kilometer scale.

Whoa this is crazy -- less than ppm single qubit gate errors! Ions have their issues but are just consistently impressive with developments like this

arxiv.org/abs/2412.04421

Sujeet Pani, Duncan Earl, Francisco Elohim Becerra
Effects of multi-photon states in the calibration of single-photon detectors based on a portable bi-photon source
https://arxiv.org/abs/2412.02566

Movie I'm watching now, cast talking about a new special fighter jet. Pilot:

"I know a little bit about this. It's quantum processin', right?"

Tech guy:

"Yeah, it's the first tested application. Ten terabits a second."

And then they just move on...

Major cringe.

We are officially cool people! 🥶❄️
#cryo 🤩

New paper today!
scirate.com/arxiv/2411.1...
We run repetition codes of up to d=51 and 100 rounds. But rather than just taking the bit values from the measurement, we take the point on the IQ plane. Decoding using this information gives significant improvements, including passive leakage reduction.

Folks I always say: Just because it is published, that does not mean it is wrong!

All-optical measurement-device-free feedforward enabling ultra-fast quantum information processing Optical circuit systems, unlike other systems, have the potential to perform quantum information processing (QIP) at higher clock rate than conventional processing. The approach utilizing the electrom...

Optical CV measurement-based quantum computation ... LET'S GO!

Work by Yamashima et al. out of Akira Furusawa's group

arxiv.org/abs/2410.20693

From two days ago...

A Millimeter-Wave Superconducting Qubit

by Anferov, Wan, Harvey, Simon, Schuster

this is cool as
(1) they can operate 1K rather than mK - a huge advantage,
(2) there is less noise at 100GHz,
(3) microwave to optical transduction should be easier

arxiv.org/abs/2411.11170

Logical computation demonstrated with a neutral atom quantum processor Transitioning from quantum computation on physical qubits to quantum computation on encoded, logical qubits can improve the error rate of operations, and will be essential for realizing valuable quant...

Atom Computing from yesterday arxiv.org/abs/2411.11822

I think this is the most impressive demonstration they have posted todate

Low loss lumped-element inductors made from granular aluminum Lumped-element inductors are an integral component in the circuit QED toolbox. However, it is challenging to build inductors that are simultaneously compact, linear and low-loss with standard approach...

Today is a great day for quantum hardware on the arXiv!

First up is superconductors.

By using a high kinetic inductance material the Yale group makes an inductor that is compact, linear and low-loss.

Super cool. Could help with fluxonium qubits

arxiv.org/abs/2411.12611

Thank you!

Yeah wrong paper 🤦‍♂️

I have a question about this.

Was done on the Tsunami box (or whatever the current incarnation is called) ? Or is this completely new hardware infrastructure that enabled your results?

Bring on the bosonic codes ...heck yeah!

I'm pretty pumped about the recent Yale GKP qudit paper.

It's funny that PsiQuantum might set up shop in Queensland Australia, a place that has no shortage of photons.

How Dulwich Quantum and Quantum Memeing could together try to solve the collective action problem.

More like if you and "Quantum Computing Memes for QMA-Complete Teens"