![]() The long-distance entanglement reported here can be combined with recently achieved initialization, readout and entanglement operations 9, 10, 11, 12, 13 on local long-lived nuclear spin registers, paving the way for deterministic long-distance teleportation, quantum repeaters and extended quantum networks. We verify the resulting non-local quantum correlations by performing single-shot readout 9 on the qubits in different bases. Detection of the photons heralds the projection of the spin qubits onto an entangled state. We establish this entanglement using a robust protocol based on creation of spin–photon entanglement at each location and a subsequent joint measurement of the photons. Here we report entanglement of two electron spin qubits in diamond with a spatial separation of three metres. Such capabilities are particularly useful when the entangled qubits are spatially separated 3, 4, 5, providing the opportunity to create highly connected quantum networks 6 or extend quantum cryptography to long distances 7, 8. ![]() Entangled quantum bits (qubits) can be used to share private information or implement quantum logical gates 1, 2. As well as being of fundamental interest, entanglement is a unique resource for quantum information processing and communication. The outcomes of independent measurements on entangled objects show correlations that cannot be explained by classical physics. ![]() Quantum entanglement between spatially separated objects is one of the most intriguing phenomena in physics. ![]()
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