David Schuster

Quantum dad, scientist, inventor, and unconventional thinker. My views are someone else's.

[David Schuster @schusterqed]

Superconducting qubits getting faster and beginning to operate at higher temperatures! Happy to answer any questions about these experiments.

[PRX Quantum @PRX_Quantum]

Higher-frequency superconducting qubits with increased thermal resilience are produced, allowing for scaling up of quantum processors with high heat dissipation budgets. @qnextquantum

https://t.co/2s6x7WklOs

[David Schuster @schusterqed]

@CJHandmer Pu238 power density ~ 5.6MeV/atom/88yr ~ 1kW/kg

For 4000K and 7wks (cont. burn which is probably not optimal)

ve~15km/s (isp ~1550s)
dV~32km/s
Etotal~150 TJ
MPu238 ~ 50 Ton

For 3000K
ve=13km/s (isp ~1350s)
dV~27km/s
Etotal~ 35 TJ
MPu238 ~ 35 Ton

[David Schuster @schusterqed]

@CJHandmer Sorry I wrote that quickly and it was confusing.

It will of course get as hot as you want as long as you prevent the heat from leaking out but practically 4000K would take creativity as PuN and PuO2 both melt at a bit less than 3000K.

[PRX Quantum @PRX_Quantum]

High-fidelity two-qubit gates are achieved with heavy-fluxonium qubits that not only break conventional paradigms but also help diversify quantum applications. @schusterqed

Article: https://t.co/rignSov1Tk
Synopsis: https://t.co/nZZvmeE1aR

[David Schuster @schusterqed]

@nicholgroupur Yup we swapped all of ours out for a kashiyamas. Those scroll pumps are terrible and I complained for years they finally got rid of them in their new ghs announced at aps.

[David Schuster @schusterqed]

@DanielleFong @_StevenFan You should check out the work of Michelle Simmons (https://t.co/sK9NM4s7G0) who uses an arm to pattern electron spin qubits atom by atom.

[David Schuster @schusterqed]

@kinglab_pchem @Lydia_Kisley Congratulations!

[Andrew Houck @nanonoodle]

Congrats to @AndreiVraji for his last paper from my group on many-body quantum optics, combining ultrastrong coupling and photonic crystals. Andrei is just finishing a postdoc with @schusterqed @photonjon and would make a fantastic faculty member.

https://t.co/ylkyCxkCSI

[David Schuster @schusterqed]

@Liv_Lanes Every time it goes off they take a jack hammer to my floor…e.g. there are holes like this all over my house now…but we are leak tight and ready to begin circulation.

[David Schuster @schusterqed]

@Robotbeat Sounds fun

[David Schuster @schusterqed]

Never heard this before 🤯🔭

[Katie Mack @AstroKatie]

Today in my general relativity class I got to talk about my favorite SUPER WEIRD COSMOLOGY FACT which is that if you have galaxies of the same size at different distances, beyond a certain distance, the farther away the galaxy is the BIGGER it appears in the sky (!!!)

[David Schuster @schusterqed]

@KViebahn cut and paste of images (+1 for math too) seems like the one important GUI feature. my best thought would be use share button to target a little service that puts images in the right place.

[David Schuster @schusterqed]

What solutions are people using for electronic lab notebooks? 📒

[David Schuster @schusterqed]

@StevenTouzard @alpsipahigil I'm not too worried about security, mostly about longevity and robustness. vscode + foam does seem interesting as I believe that would get you a lot of the benefits of obsidian, but with Liveshare, and allowing vscode to be your code and lab notebook...

[David Schuster @schusterqed]

@spinlabmsu This one gets bonus points for using Netscape as its demo browser

[David Schuster @schusterqed]

@alpsipahigil I have been using it a lot for my own organizational notes. It seems like it might be good as a lab notebook. I wish it could be self hosted though. Are there things you particularly like or dislike about it? Or tricks you have found?

[David Schuster @schusterqed]

@tahantech I have been playing with it to write notes for a class and it does seem really nice especially for theory. Wasn’t sure how it would go for an experimental lab notebook, which tends to be more linear and wants to have very low friction for adding things.

[David Schuster @schusterqed]

@newplatonism @CottetNathanael So basically comparable to the absolute best transmons after 10 yrs of optimization, but here there have been a total of 10 students from UMD and Chicago (though thankfully more people are joining at other great places now).

[David Schuster @schusterqed]

@newplatonism @CottetNathanael T1/T2 are roughly 300us in 2D (our group) and >1ms in 3D (UMD group). Lincoln Lab has given talks claiming ~1ms in 2D... I think UMD has the best single and two qubit error rates currently ~1e-4 for 1d and maybe a few 1e-4 for 2qb. speeds are 5-20ns for 1qb and 30-100ns for 2qb.