While preparing our children for their respective next schoolyears, an unexpected opportunity arose to teach a little quantum mechanics. On one suggested homeschooling curriculum, I saw a simple electrical circuit. And if you know a little about transistors and classical computing circuits, you can easily transition to qubits and quantum computing circuits.
Start with a simple classical circuit that includes a switch and a lightbulb. When the switch is "off," the circuit is open -- there is a break in the path -- current does not flow, and the lightbulb does not shine. When the switch is "on," the circuit is closed -- the path is unbroken as if the switch is not even there -- current flows through, and the lightbulb shines.
An oversimplified transistor description is the same as the switch in this circuit. For a certain voltage range, a transistor acts like an open switch; current does not flow, and we represent that "off" state as a zero. For another voltage range, the transistor acts like a closed switch; current flows, and we…
