QR3.4 Processing Spreads

The no-cloning theorem (Wootters & Zurek, 1982) says we can’t copy quantum states because reading a quantum state gives a physical event that destroys it. However the quantum system that made them in the first place can easily make more. Quantum processing can’t be saved but it can be instantiated and it turns out that in this sense nature is the ultimate copy machine.

3.4.1 Light Spreads.

3.4.2 Instantiation.

3.4.3 What is a Photon?