Pro chapter
Quantum Circuits and Protocols
Circuit notation, no-cloning, teleportation, and superdense coding
This chapter is part of the paid advanced curriculum. The free path remains complete through multi-qubit foundations; Pro unlocks this full chapter, its advanced exercises, and the currently published guided calculation labs.
Learning objectives
- Read time order, wires, controls, and measurements in circuit diagrams.
- Explain why arbitrary unknown states cannot be copied by a unitary circuit.
- Trace the information flow in teleportation without claiming faster-than-light transfer.
- Compare teleportation and superdense coding as protocols that combine entanglement with classical communication.
What Pro unlocks here
- Circuit notation
- No-cloning
- Teleportation
- Superdense coding
- Worked example