Cases of wrong intuition

A quantum computer tries all answers at once

Superposition means a qubit is 0 and 1 at the same time

Entanglement allows faster-than-light communication

Measurement just reads a pre-existing value

The choice of measurement basis does not matter

Quantum objects are sometimes waves and sometimes particles

You can copy a quantum state just like copying a classical bit

A deeper circuit is always more powerful

Quantum gates can be irreversible just like classical gates

A bigger circuit is always more expressive

CNOT gate creates entanglement on its own

Any classical gate has a direct quantum equivalent

Grover search works like a classical binary search

Shor algorithm will instantly break all encryption

Quantum teleportation moves matter instantly

Quantum speedup applies to every problem

Quantum supremacy means quantum computers are now better than classical

HHL gives exponential speedup for solving linear systems

Quantum ML always beats classical ML

Barren plateaus are just a training trick to fix

Data encoding into qubits is straightforward

Quantum kernels are always superior to classical kernels

Variational circuits will scale to useful problems soon

More qubits always means better performance

Noise only slightly affects quantum results

Decoherence is just another word for noise

All qubits in a chip can interact directly

Quantum volume is just a marketing metric with no scientific meaning

D-Wave quantum annealers are the same as gate-based quantum computers