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
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