There is also another type of comb that is extremely useful: the GKP qubit (introduced in https://arxiv.org/abs/quant-ph/0008040 https://arxiv.org/abs/quant-ph/

There is also another type of comb that is extremely useful: the GKP qubit (introduced in https://arxiv.org/abs/quant-ph/0008040 https://arxiv.org/abs/quant-ph/0008040). Its wavefunction is a comb.