title: Realization of reliable solid-state quantum memory for photonic polarization qubit.
abstract: Faithfully storing an unknown quantum light state is essential to advanced quantum communication and distributed quantum computation applications. The required quantum memory must have high fidelity to improve the performance of a quantum network. Here we report the reversible transfer of photonic polarization states into collective atomic excitation in a compact solid-state device. The quantum memory is based on an atomic frequency comb (AFC) in rare-earth ion-doped crystals. We obtain up to 0.999 process fidelity for the storage and retrieval process of single-photon-level coherent pulse. This reliable quantum memory is a crucial step toward quantum networks based on solid-state devices.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.
authors.forename: Zong-Quan
authors.initials: ZQ
authors.lastname: Zhou
authors.forename: Wei-Bin
authors.initials: WB
authors.lastname: Lin
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.forename: Chuan-Feng
authors.initials: CF
authors.lastname: Li
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo