Quantum Fiber is Lumen's fiber-to-the-home brand — the same company behind CenturyLink, but pointed at the future instead of the copper past. In Boulder it's the only widely sold connection that delivers symmetrical speed, where your upload matches your download. The catch is availability: fiber reaches only about 40% …

Boulder has lived through every era of residential internet. Residents who were online in the mid-1990s remember the screech of a 56k modem and the frustration of a busy phone line. A decade later, Comcast cable had taken over most of the city. Today, Boulder has Xfinity gigabit cable, two competing fiber networks, …