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#quantumcomputing

7 posts7 participants1 post today
Public
Oscar Cunningham

People say it's a misconception that quantum computers can evaluate a function on all its possible inputs in parallel. But actually a lot of quantum algorithms do begin by applying a function to a superposition of all possible inputs. It's just that after that point you need to do some difficult linear algebra and you can't always extract the information you want.

In fact, you can define a lot of important complexity classes in this way. The set of problems solvable in polynomial time with an oracle that evaluates a given circuit on all its possible inputs and tells you …

P: … nothing.
BPP: … a randomly chosen output.
PP: … a majority output.
NP: … if any of the outputs is nonzero.
co-NP: … if all of the outputs are nonzero.
PSPACE: … a fixed point.

#Math#Maths#Mathematics
Public
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

Debate erupts around #Microsoft’s #quantumcomputing claims
#Physicists cast doubt on #Majorana1 chip
Henry Legg, #physicist at Univ of St. Andrews who had two preprints challenging the work, attacked. “It doesn’t look like Majoranas, at least to me,” Legg said. “Any company claiming to have a topological qubit in 2025 is essentially selling a fairy tale [that] undermines the field of #quantum computation … and public confidence in science.”
science.org/content/article/de
archive.ph/PD8mx

Continued thread
Public
Nonilex

Deeper cuts could be on the way. As soon as this week, the #Trump admin is expected to propose sharp reductions in discretionary spending, including on #research & #development, as part of the annual budget process.

Economists have warned that such cuts could undermine American competitiveness in areas like #vaccine development, #AI & #QuantumComputing, & could slow #growth in #income & #productivity in the long term.

#economy#science#innovation
Public *
podfeet

@bart explains the difference between quantum computers and current digital computers and how we're ready with a new cryptography algorithm when quantum computing becomes a reality. This episode originally aired as part of Security Bits on the NosillaCast, but we wanted a standalone version you could send to your friends.

podfeet.com/blog/2025/04/ccatp

Podfeet Podcasts · CCATP #813 — Bart Busschots on Quantum Computing & Cryptography - Podfeet PodcastsThis episode of Chit Chat Across the Pond is going to be a bit different. On the NosillaCast #1042 for April 27th, Bart Busschots and I recorded his usual segment on Security Bits, but the majority of it was a deep dive. The subject was whether cryptography as we know it is doomed because of […]
#Cryptography#QuantumComputing
Public
formuchdeliberation

Interesting Engineering: Unhackable quantum messages travel 158 miles without cryogenics for first time…

Are we ready for the day when quantum computers will become capable of hacking all the passwords on the internet?... #quantumcomputing #quantumscience #cybersecurity #cryogenics #physics #hacking #internet

formuchdeliberation.wordpress.

for much deliberation · Interesting Engineering: Unhackable quantum messages travel 158 miles without cryogenics for first time…Are we ready for the day when quantum computers will become capable of hacking all the passwords on the internet?… #quantumcomputing #quantumscience #cybersecurity #cryogenics #physics #hacki…
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