A bit hard to wrap my head around it even in its popular simplified form but here it is: a quantum computer could reverse the arrow of time breaking our well established norm of causal asymmetry.

# Tag: Quantum Computing

## Skepticism on Quantum Computers

Mathematician Gil Kalai thinks quantum computing won’t pan out.

He has analyzed the issue by looking at computational complexity and, critically, the issue of noise. All physical systems are noisy, he argues, and qubits kept in highly sensitive “superpositions” will inevitably be corrupted by any interaction with the outside world. Getting the noise down isn’t just a matter of engineering, he says. Doing so would violate certain fundamental theorems of computation.

## Quantum computing explained…

## Quantum computing: where we are now

Quanta Magazine has a situationer on quantum computing today.