Does The Richest Quantum Computing Company Also Have The Best Technology? [with Subtitles]

PsiQuantum has promised to build the world's first useful quantum computer, so we decided to take a closer look at their technology. Mingyu and I talk about everything from their successes and challenges, as covered in their recent arXiV preprint. Enjoy and don't forget to subscribe!
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Video Editing: ‪@GabrielCarusetta‬
Thumbnail: Sayantani Kayal
Timestamp:
00:00 - Why this is big news
01:16 - How to use photons as qubits
04:10 - PsiQuantum's big successes
05:45 - Big Roadblocks ahead still
Reference paper for this video:
Alexander, Koen, et al. "A manufacturable platform for photonic quantum computing." arXiv:2404.17570 (2024).

[@Karnikhil91]

😢 Thanks u bro... finally some one talking about quantum computing in this level

[@craftsland1]

How much fps we can get in Minecraft with this

[@anirbanmandal3123]

Was really waiting for your new video

[@debobiswas]

Got really busy, but there will be more frequent uploads next few weeks!

[@anirbanmandal3123]

@@debobiswas being an undergrad I don't really understand everything but have learnt a lot through your videos

[@debobiswas]

Please comment your questions wherever you don't understand, that's what Mingyu and I are here for!

[@mingyukang6734]

Super glad to hear that! Thanks a lot!

[@michaelstraus2779]

You mentioned that measurement based quantum computing can be done fault tolerantly. Does that require mid-circuit decisions on what measurements to make or is it all post processing? If mid-circuit communication with a classical computer is needed, it is a challenge to store photonic qubits long enough?

[@mingyukang6734]

Hi! Thanks for these great questions. I'll do my best, but if there's someone who knows better than me out there please intervene!
In measurement based quantum computing (and its fault tolerant version), when you do the measurement, you need to have the measurement results from previous rounds to determine which basis to measure. So mid-circuit decisions are definitely needed. I think post processing (or probabilistically succeeding?) is more for the stage of generating the large entangled state than the computation stage.
The challenge you mention (storing photonic qubits long enough) is actually related to the photon loss mentioned in the paper (and this video). So yes, it'd be great if classical computation/communication time is not the bottleneck for requiring longer storage time. With finding better materials, etc. (as mentioned in this paper) there seems to be ways to improve the loss and be able to handle longer storage time.

[@gudentach1]

Schön erklärt.

[@LaiGenDiao]

Is measurement base quantum computing universal? Can it perform any operation that can be implemented on gate based computing?

[@mingyukang6734]

Yes, measurement based quantum computing is universal, just like gate based quantum computing!

[@diegoalejandrosanchezherre4788]

What about qbits made out of atomic vacancys??

[@debobiswas]

Vacancy centers are very promising in quantum information, but qubit counts are generally small. They make great quantum sensors though.

[@rodmondh]

Curious if quantum computers can run Eldenring @ 60fps & and didn't see a link to get one on Amazon order Thank you!

[@debobiswas]

Lol