What qubits, interference and error correction mean—and why useful machines remain difficult.
Quantum is not simply faster computing
A quantum computer manipulates probability amplitudes in ways that can help certain algorithms. It does not make every calculation faster and it does not replace ordinary computers.
Fragile information creates engineering challenges
Qubits are sensitive to noise, so useful results require careful control and error management. Scaling the number of physical qubits is different from scaling reliable logical computation.
Judge claims by the demonstrated task
Ask whether a result solved a meaningful problem, how it compares with the best classical method and what assumptions were required. Progress is real, but timelines deserve caution.