Nvidia CEO Jensen Huang states that quantum computers are unlikely to be useful for another 20 to 30 years, with effective technology not expected until 2045. Current challenges include high error rates in qubits, hindering practical applications. Meanwhile, companies like Apple and Google are developing solutions to address potential cybersecurity threats posed by future quantum advancements. The quantum computing field is overshadowed by the ongoing AI hype, as evidenced by a recent drop in related stock prices.