Mathematics
The math under the qubits, done on paper before it is trusted. The Born rule, complex numbers, the tensor product, each one checked against code.
Posts
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19:14 Quantum Computing Complex numbers are the gateway to quantum
Multiplying by i is a quarter turn, Euler's formula is the unit circle, and suddenly the imaginary number is the thing you measure.
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22:33 Quantum Computing Measurement is not magic: the Born rule by hand
Why a quantum result is a probability: amplitude squared, worked on paper and checked in NumPy, one basis at a time.