Quantum entanglement between an optical photon and a solid-state spin qubit

Quantum entanglement between an optical photon and a solid-state spin qubit 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Nature Publishing Group (NPG)

Quantum entanglement between an optical photon and a solid-state spin qubit

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Publisher
Nature Publishing Group (NPG)
Copyright
Copyright © 2010 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
ISSN
0028-0836
eISSN
1476-4687
D.O.I.
10.1038/nature09256
Publisher site
See Article on Publisher Site

Abstract

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

Journal

NatureNature Publishing Group (NPG)

Published: Aug 5, 2010

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