Quantum Computers and Encryption: Why the Threat Is Still Years Away

Remember the predictions that quantum computers were about to crack every cipher, destroy Bitcoin, and turn the internet upside down?
Ten years have passed — and nothing happened. Why?

Let’s look at where quantum technology actually stands in 2025 and when to expect a real revolution.

Current State of Quantum Computing

There are only around 200 quantum computers operating in the world — across research labs and corporate data centers.
These are still experimental machines, requiring near-absolute-zero temperatures and enormous stabilization infrastructure.

That said, progress is real.
Google Willow (2024) — a 105-qubit processor — demonstrated that as qubit count grows, errors can be reduced exponentially. It solved a problem in 5 minutes that would take classical supercomputers 10²⁵ years.
In 2025, researchers from Texas and D-Wave demonstrated “quantum supremacy” on practical simulation tasks for the first time.

Why the Quantum Computing Encryption Threat Remains Distant

The key distinction is between physical and logical qubits.
Physical qubits are real quantum particles that produce errors every millisecond.
Logical qubits are stable combinations of hundreds or thousands of physical qubits capable of operating reliably.

Breaking RSA-2048 via Shor’s algorithm requires a machine with 20 million physical qubits.
The largest system in existence, IBM Condor, has just 1,121 qubits.
The gap is thousands of times wider than what’s needed.

Why Encryption Is Still Safe from the Quantum Threat

• Error rates in quantum circuits remain around 0.1–1% — still far too high.
• Coherence time is measured in microseconds: qubits lose their state almost instantly.
• Scaling is an unsolved engineering problem: millions of qubits demand extraordinary resources.

Even under the most optimistic projections, cryptographically dangerous quantum machines will not exist before 2035.
For now, the internet remains safe.

The World Is Already Preparing

Since 2024, NIST (the body that defines security standards) has ratified the first post-quantum cryptography standards — ML-KEM and ML-DSA.
The UK has announced a transition plan:

• risk assessment — by 2028;
• migration of critical systems — by 2031;
• full transition — by 2035.

This is known as preparing for Q-Day — the day quantum computers become genuinely dangerous.

Reality vs. Hype: Putting the Quantum Computing Encryption Debate in Perspective

Quantum computers are neither a failure nor a miracle.
They are a slowly maturing technology where every breakthrough demands advances in physics, engineering, and error theory simultaneously.

The media overstated the threat while underestimating the scale of the challenge.
The quantum apocalypse hasn’t arrived — because the physics is harder than the headlines.

The revolution is underway — just not at the pace of the daily news cycle.
We are still far from a quantum doomsday, but closer than ever to understanding how it could happen.