Sequentially Encodable Codeword Stabilized Codes (2405.06142v3)

Abstract: An m-uniform quantum state on n qubits is an entangled state in which every m-qubit subsystem is maximally mixed. Such a state spans a pure [[n,0,m+1]] quantum error correcting code (QECC). Starting with an m-uniform state realized as the graph state associated with an m-regular graph, and a classical [n,k,d \ge m+1] binary linear code with certain additional properties, we construct codeword stabilized (CWS) codes that are pure [[n,k,m+1]] QECCs. We propose measurement-based protocols for encoding into code states and recovery of logical qubits from code states. Our proposed protocols support sequential encoding and partial recovery of logical qubits, which can be useful for quantum memory applications.