npj Quantum Information, Published online: 02 November 2024; doi:10.1038/s41534-024-00910-0
Qubit teleportation between a memory-compatible photonic time-bin qubit and a solid-state quantum network node
This paper reports on a quantum interface linking a diamond NV center quantum network node and 795nm photonic time-bin qubits compatible with Thulium and Rubidium quantum memories.
The interface makes use of two-stage low-noise quantum frequency conversion and waveform shaping to match temporal and spectral photon profiles. Two-photon quantum interference shows high indistinguishability between converted 795nm photons and the native NV center photons.
The team used the interface to demonstrate quantum teleportation including real-time feedforward from an unbiased set of 795nm photonic qubit input states to the NV center spin qubit, achieving a teleportation fidelity well above the classical bound.
This proof-of-concept experiment shows the feasibility of interconnecting different quantum network hardware.