  Trapped atomic ions constitute one of the leading physical platforms for
building the quantum repeater nodes to realize large-scale quantum networks. In
a long-distance trapped-ion quantum network, it is essential to have
crosstalk-free dual-type qubits: one type, called the communication qubit, to
establish entangling interface with telecom photons; and the other type, called
the memory qubit, to store quantum information immune from photon scattering
under entangling attempts. Here, we report the first experimental
implementation of a telecom-compatible and crosstalk-free quantum network node
based on two trapped $^{40}$Ca$^{+}$ ions. The memory qubit is encoded on a
long-lived metastable level to avoid crosstalk with the communication qubit
encoded in another subspace of the same ion species, and a quantum wavelength
conversion module is employed to generate ion-photon entanglement over a
$12\,$km fiber in a heralded style. Our work therefore constitutes an important
step towards the realization of quantum repeaters and long-distance quantum
networks.
