Generalized symmetry extends the usual notion of symmetry to ones that are of higher form, acting on subsystems, noninvertible, etc. The concept was defined in the field theory context using the idea of topological defects. On the lattice, an immediate consequence is that a symmetry twist is moved across the system by a sequential quantum circuit. In this paper, we ask how to deduce the full, potentially noninvertible symmetry action from the unitary sequential circuit and how the connection to a sequential circuit constrains the properties of the generalized symmetries. We find that, for symmetries that contain the trivial symmetry operator as a fusion outcome, which we call annihilable symmetries, the sequential circuit fully determines the symmetry action and puts various constraints on their fusion. In contrast, for unannihilable symmetries, like those whose corresponding twist is a Cheshire string, a further one-dimensional sequential circuit is needed for the full description. Matrix-product-operator and tensor-network-operator representations play an important role in our discussion.

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• Quantum circuits
• Discrete symmetries
• Spin lattice models
• Tensor network methods
• Z_2 symmetry