Unconditional quantum teleportation between distant solid-state qubits
  Realizing robust quantum information transfer between long-lived qubit registers is a key challenge for quantum information science and technology. Here we demonstrate unconditional teleportation of arbitrary quantum states between diamond spin qubits separated by 3 meters. We prepare the teleporter through photon-mediated heralded entanglement between two distant electron spins and subsequently encode the source qubit in a single nuclear spin. By realizing a fully deterministic Bell-state measurement combined with real-time feed-forward we achieve teleportation in each attempt while obtaining an average state fidelity exceeding the classical limit. These results establish diamond spin qubits as a prime candidate for the realization of quantum networks for quantum communication and network-based quantum computing. 
Wolfgang Pfaff, Bas Hensen, Hannes Bernien, Suzanne B. van Dam,   Machiel S. Blok, Tim H. Taminiau, Marijn J. Tiggelman, Ray...
quant-ph cond-mat.mes-hall