Quantum entanglement is among the most fascinating aspects of quantum theory . Entangled optical photons are now widely used for fundamental tests of quantum mechanics and applications such as quantum cryptography . Several recent experiments demonstrated entanglement of optical photons with trapped ions , atoms and atomic ensembles , which are then used to connect remote long-term memory nodes in distributed quantum networks . Here we realize quantum entanglement between the polarization of a single optical photon and a solid-state qubit associated with the single electronic spin of a nitrogen vacancy centre in diamond. Our experimental entanglement verification uses the quantum eraser technique , and demonstrates that a high degree of control over interactions between a solid-state qubit and the quantum light field can be achieved. The reported entanglement source can be used in studies of fundamental quantum phenomena and provides a key building block for the solid-state realization of quantum optical networks . A quantum network consists of several nodes, each containing a long-lived quantum memory and a small quantum processor, that are connected via entanglement. Its potential applications include long-distance quantum communication and distributed quantum computation . Several recent experiments demonstrated on-chip entanglement of solid-state qubits
Nature – Nature Publishing Group (NPG)
Published: Aug 5, 2010
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