Jiuzhang 3.0 is not a cryptographic threat. But the next generation of universal fault-tolerant machines will be!

 

Recently, China made waves with its photonic quantum computer, Jiuzhang 3.0, solving Gaussian boson sampling problems 10 billion times faster than classical supercomputers.

✅ Yes, it's a leap in quantum speed.
❌ No, it cannot break encryption - yet.

Jiuzhang isn’t a universal quantum computer.

❌ It can’t run Shor’s algorithm.
❌ It has no error-corrected qubits, no gates, and no fault tolerance.

But the writing is on the wall.

🧠 What would it take to break RSA-2048?

- 4,000 logical qubits
- Millions of physical qubits (with error correction)
- A week of compute time, maybe less

And it’s no longer theoretical - it’s on the roadmap

⚠️ The risk isn’t Jiuzhang. It’s complacency.

Most organizations are still relying on RSA and ECC, while quantum research accelerates at a pace few outside the field are tracking.

Harvest-now-decrypt-later isn’t a theory anymore.

Data stolen today could be decrypted in the next decade - or sooner.

🛡️ The move to post-quantum cryptography isn’t optional.

It’s the bare minimum for long-term security.

If you’re not planning for a post-quantum world, someone else is - and it won’t be for your benefit.

Also visit: https://quangntenemy.substack.com/p/jiuzhang-30-is-not-a-cryptographic

"Harvest Now, Decrypt Later" - and Nobody Cares

 

The quantum threat isn't some distant apocalypse.

It's happening now - just slowly enough that no one feels responsible.

Attackers are collecting encrypted data today, confident that tomorrow's quantum machines will crack it open like a cheap lock.

And why wouldn't they? Most defenders are busy chasing compliance checkboxes and pretending RSA will hold forever.

Everyone talks about “zero trust,” but they still trust 90s-era cryptography in a world that's moving toward post-truth, post-ethics, and soon, post-quantum.

The uncomfortable reality: 💀If your secrets can't survive a decade on ice, they're already compromised.

And if your org isn't even thinking about post-quantum resilience, it's not security - it's theater.

But hey, at least the slide decks look good.

https://quangntenemy.substack.com/p/harvest-now-decrypt-later-and-nobody