Fig. 1: Concept of quantum teleportation via absorption and emission in a diamond NV center.
From: Quantum teleportation of a photon via absorption and emission for quantum repeater nodes
a Schematic principle of quantum state transfer of the polarization state from the absorbed photon to the emitted photon. b Transfer process consisting of four steps: (i) generation of electron-nitrogen spin entanglement, (ii) transfer of the polarization state of the absorbed photon \({\left\vert \psi \right\rangle }_{{{\rm{{P}}_{in}}}}\) to the nuclear spin state of the nitrogen \({\left\vert \psi \right\rangle }_{{{\rm{N}}}}\) via the photon-electron Bell state measurement (BSM) upon absorption, (iii) generation of photon-electron entanglement upon emission, and (iv) transfer of the nuclear spin state of the nitrogen to the polarization state of the emitted photon \({\left\vert \psi \right\rangle }_{{{{\rm{P}}}}_{{{\rm{out}}}}}\) via the electron-nitrogen BSM.
