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The central concept of the system is a unique number, a PlusCode, assigned to each programme, and published in television listings in newspapers and magazines (such as TV Guide). To record a programme, the code number is taken from the newspaper and input into the video recorder, which would then record on the correct channel at the correct time.
Quantum error-correcting codes restore a noisy, decohered quantum state to a pure quantum state. A stabilizer quantum error-correcting code appends ancilla qubits to qubits that we want to protect. A unitary encoding circuit rotates the global state into a subspace of a larger Hilbert space.