Now that we know all about qubits of various types, this chapter covers the most mainstream techniques for maintaining a qubit in the real, noisy world, aside from the algorithmic techniques we covered in Chap. 3. Without the techniques in this chapter, we won’t even have a qubit to perform error correction on! Read to learn about cooling with a dilution refrigerator, and how to build pieces of the mechanical assembly that supports your QPU within.