# Tag Info

## Hot answers tagged quantum-state

### Strange inequivalence between superdense coding and teleportation

Imagine we have some two-qubit state $\omega$ which Bob holds after the transmission of a qubit from Alice. For superdense coding, he's going to measure it in the Bell basis. Let's assume the answer ...
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### How to factorize a multi-qubit quantum state?

What you ask is even harder than asking whether a state is separable. The latter is considered a complex problem, sometimes NP-hard. See, e.g., https://en.wikipedia.org/wiki/Separable_state for a ...