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Long-lived and high-fidelity memory for photonic polarization qubit (PPQ) iscrucial for constructing quantum networks. Here we present an EIT-basedmillisecond storage system in which a moderate magnetic field is applied on acold-atom cloud to lift Zeeman degeneracy. PPQ states are stored as twomagnetic-field-insensitive spin waves. Especially, the influence ofmagnetic-field-sensitive spin waves on the storage performances is almosttotally avoided. The measured average fidelities of polarization states are98.6% at 200 us and 78.4% at 4.5 ms, respectively.

Long lifetime and high-fidelity quantum memory of photonic polarization qubit by lifting Zeeman degeneracy