The threshold for effective quantum computing has improved to around 99% fidelity, meaning that if a quantum computer operates correctly 99% of the time, it can effectively manage errors and perform complex calculations.

The challenge in quantum computing lies in scaling; while achieving high fidelity with a small number of qubits is possible, creating a robust system that consistently performs well with a larger number of qubits is a significant engineering problem.

The key to effective quantum computing is ensuring qubits interact as desired, rather than just focusing on increasing coherence times.

Improving the reliability of quantum gates and reducing error rates will be crucial for scaling quantum computers and enabling them to solve more complex problems.

To be genuinely useful, a quantum computer needs to exceed 50 qubits, as tasks requiring fewer qubits can still be efficiently simulated by classical computers, making them less impactful.

We can create qubits that are entangled at 90% quality, but we can store them practically forever, allowing us to enhance their quality through a process similar to improving a staticky communication channel.

The coherence time of a qubit, which indicates how long it can interact with the outside world, has improved significantly, increasing about tenfold every three years over the past 15 years.

In quantum computing, the challenge is to keep qubits isolated to prevent decoherence, which can be achieved through various techniques, including using vacuum chambers and ion traps.

The ability to perform hundreds of thousands of operations per second in quantum computing means that even a short decoherence time can be sufficient for many calculations.