Classical computers can only take on one such state per gate; 0 or 1. A quantum computer is a processor whose functionality is aligned with quantum mechanics and can therefore take on quantum mechanical states. This is done via so-called qubits, which have more than one state at the same time and thus can solve mathematical problems much faster, or at all, if compared to classical computers.
All of us know QR codes, those little funny looking boxes which, when scanned, lead us to a website or other information. I will not dive too deeply into their exact functionality. You will find black and white boxes in a QR Code, which are read as bits (white = 0, black = 1) by your QR Code reading app and show an address of a website or other information. What does this have to do with our murder victim?
Unusual topic for a futuristic blog, I know. So why a TV show? In a nutshell: Murderous computer genius engraves computer code as a fractal pattern on a bone of his victim. The "good guys" scan the bones and their computer blows up, preventing them from reconstructing and identifying the victim. Sounds perfectly legitimate to me too, I do this kind of thing all day long. Don't! So I decided to give you a rough reality check of these concepts, because in real life there are things like fractal encryption (yes, even outside the realm of USS-Enterprise-E against the Borgs).