Title: Quantum Journal Club: Long Lifetime and High-Fidelity Quantum Memory of Photoni
Speaker: Nan Jiang Tsinghua University
Time: 2015-05-29 15:00-2015-05-29 16:00
Venue: MMW S327


Long-lived and high-fidelity memory for a photonic polarization qubit (PPQ) is crucial for constructing quantum networks. We present a millisecond storage system based on electromagnetically induced transparency, in which a moderate magnetic field is applied on a cold-atom cloud to lift Zeeman degeneracy and, thus, the PPQ states are stored as two magnetic-field-insensitive spin waves. Especially, the influence of magnetic-field-sensitive spin waves on the storage performances is almost totally avoided. The measured average fidelities of the polarization states are 98.6% at 200 s and 78.4% at 4.5 ms, respectively.

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