Realization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species
L. Feng, Y-Y Huang, Y-K Wu, Weixuan Guo, J. Ma, H.-X. Yang, L. Zhang, Y. Wang, Chuanxin Huang, C. Zhang, Yao Li, B-X Qi, Yunfei Pu, Z-C Zhou, L-M Duan
Abstract
Abstract Generating ion-photon entanglement is a crucial step for scalable trapped-ion quantum networks. To avoid the crosstalk on memory qubits carrying quantum information, it is common to use a different ion species for ion-photon entanglement generation such that the scattered photons are far off-resonant for the memory qubits. However, such a dual-species scheme can be subject to inefficient sympathetic cooling due to the mass mismatch of the ions. Here we demonstrate a trapped-ion quantum network node in the dual-type qubit scheme where two types of qubits are encoded in the S and F hyperfine structure levels of 171 Yb + ions. We generate ion photon entanglement for the S -qubit in a typical timescale of hundreds of milliseconds, and verify its small crosstalk on a nearby F -qubit with coherence time above seconds. Our work demonstrates an enabling function of the dual-type qubit scheme for scalable quantum networks.