Realization of a Cascaded Quantum System: Heralded Absorption of a Single Photon Qubit by a Single-Electron Charged Quantum Dot

Physical Review Letters
Aymeric DelteilA Imamoğlu

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.

References

Apr 12, 1993·Physical Review Letters·H J Carmichael
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Mar 21, 2008·Physical Review Letters·D Pinotsi, A Imamoglu
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Apr 14, 2012·Nature·Stephan RitterGerhard Rempe
Feb 7, 2013·Nature Communications·O GazzanoP Senellart
Nov 2, 2013·Nature Communications·W B GaoA Imamoğlu
Nov 22, 2014·Nature Communications·Christoph KurzJürgen Eschner
Apr 11, 2015·Physical Review Letters·H M MeyerM Köhl
Jul 22, 2015·Physical Review Letters·Norbert KalbGerhard Rempe

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Citations

Nov 24, 2017·Nature·Nicolas MaringHugues de Riedmatten
Oct 20, 2018·Science·Stephanie WehnerRonald Hanson
Nov 26, 2019·Physical Review Letters·C T NguyenM D Lukin
Jun 6, 2019·Optics Express·Uttam PaudelDuncan G Steel

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