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

To manage errors in quantum computing, researchers use multiple physical qubits to represent a single logical qubit, allowing for error correction without directly observing the qubits.

The approach to scalability in quantum computing involves creating small, efficient quantum modules that can be linked together, rather than trying to scale up a single large quantum computer, which presents numerous challenges.

Using multiple links in quantum communication can improve the quality of information transfer, similar to how conventional technology compensates for weak signals by requesting data multiple times to ensure accuracy.

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.

The ability to lay out qubits in a grid simplifies the design of quantum computers, as it aligns with the short-range interactions typical in quantum physics, making it easier to achieve reliable operations. Topological codes allow qubits to be arranged in a grid, enabling them to communicate with immediate neighbors without the need for extensive movement, which simplifies operations significantly.

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.

Microsoft is pursuing topological quantum computing, aiming to create qubits that can be controlled much better than current technologies, although it's still in the early stages of development. Scaling quantum technologies is challenging due to control engineering and other factors.

The number of configurations in a quantum system grows exponentially with the number of qubits, making quantum computers potentially capable of computations beyond the reach of classical computers.