Bad Qubits — Learn Quantum by Doing

Multiple choice

The lesson lists three ways to encode classical features x into qubits. Which description matches AMPLITUDE encoding?

Apply one single-qubit rotation Ry(x_i) per feature, one qubit per feature
Store a binary string x as the computational-basis state |x>, wasting superposition
Pack 2^n normalized values x_i/||x|| directly into the amplitudes — exponentially compact, but state preparation can be expensive
Measure <Z_0> and feed the result back as the encoded feature