Abstract
Photonic losses pose a major limitation for the implementation of a quantum state transfer between nodes of a quantum network. A measurement that heralds a successful transfer without revealing any information about the qubit may alleviate this limitation. Here, we demonstrate the heralded absorption of a single photonic qubit, generated by a single neutral quantum dot, by a single-electron charged quantum dot that is located 5 m away. The transfer of quantum information to the spin degree of freedom takes place upon the emission of a photon; for a properly chosen or prepared quantum dot, the detection of this photon yields no information about the qubit. We show that this process can be combined with local operations optically performed on the destination node by measuring classical correlations between the absorbed photon color and the final state of the electron spin. Our work suggests alternative avenues for the realization of quantum information protocols based on cascaded quantum systems.
- Received 24 January 2017
DOI:https://doi.org/10.1103/PhysRevLett.118.177401
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Linking Two Quantum Dots with Single Photons
Published 25 April 2017
Researchers have transferred quantum information from one quantum dot to another dot 5 m away using photonic qubits as the relay.
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