Explore the challenges and limitations of qubits in quantum computing through this insightful 28-minute talk by John Martinis from UC Santa Barbara, delivered at the Quantum Industry Day 2022. Delve into key topics such as the intronist threshold conjecture, error rates, measurement errors, and the concept of quantum supremacy. Examine cross entropy benchmarking and data, understand the importance of fidelity in quantum systems, and learn about superconnected qubits. Gain valuable insights into the current state and future prospects of quantum computing technology.