In the theory of quantum communication, the entanglement-assisted stabilizer formalism is a method for protecting quantum information with the help of entanglement shared between a sender and receiver before they transmit quantum data over a quantum communication channel. It extends the standard stabilizer formalismby including shared entanglement (Brun et al. 2006).The advantage of entanglement-assisted stabilizer codes is that the sender canexploit the error-correcting properties of an arbitrary set of Pauli operators.The sender's Pauli operators do not necessarily have to form anAbelian subgroup of the Pauli group over qubits.The sender can make clever use of her sharedebits so that the global stabilizer is Abelian and thus forms a validquantum error-correcting code.