[nerdsniper]

Flash memory (quantum tunneling), lasers (stimulated emission), transistors (band theory), MRI machines (nuclear spin), GPS (atomic transition), LED's (band gap), digital cameras (photoelectric effect), ...the list does, in fact, go on, and on, and on.

[narcraft]

Did you intentionally list things that are clearly not essential to day-to-day life?

[refulgentis]

I'd argue flash memory and transistors certainly are.