From remote entanglement between solid state qubits to deterministic quantum teleportation

Quantum networks enable the distribution of quantum information that is processed and stored in local nodes [1]. Setting up a quantum network requires the generation of entanglement between widely separated qubits combined with local long-lived quantum registers. Here we present our recent results towards the realization of scalable quantum networks with solid-state qubits. We have entangled two spin qubits, each associated with a nitrogen vacancy center in diamond [2]. The two diamonds reside in separate setups three meters apart from each other. With no direct interaction between the two spins to mediate the entanglement, we make use of a scheme based on quantum measurements: we perform a joint measurement on photons emitted by the NV centers. The detection of the photons projects the spins into an entangled state. We verify the generated entanglement by single-shot readout of the spin qubits in different bases and correlating the results. We will present these experiments along with our latest results towards deterministic quantum teleportation between distant qubits. [1] H. J. Kimble, Nature, 453, 1023 (2008) [2] H. Bernien et al., Nature 497, 86 (2013).