Wavelength-tunable sources of entangled photons interfaced with atomic vapours

Rinaldo Trotta (), Javier Martín-Sánchez, Johannes S. Wildmann, Giovanni Piredda, Marcus Reindl, Christian Schimpf, Eugenio Zallo, Sandra Stroj, Johannes Edlinger and Armando Rastelli
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Rinaldo Trotta: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Javier Martín-Sánchez: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Johannes S. Wildmann: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Giovanni Piredda: Forschungszentrum Mikrotechnik, FH Vorarlberg
Marcus Reindl: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Christian Schimpf: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Eugenio Zallo: Institute for Integrative Nanosciences, IFW Dresden
Sandra Stroj: Forschungszentrum Mikrotechnik, FH Vorarlberg
Johannes Edlinger: Forschungszentrum Mikrotechnik, FH Vorarlberg
Armando Rastelli: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract The prospect of using the quantum nature of light for secure communication keeps spurring the search and investigation of suitable sources of entangled photons. A single semiconductor quantum dot is one of the most attractive, as it can generate indistinguishable entangled photons deterministically and is compatible with current photonic-integration technologies. However, the lack of control over the energy of the entangled photons is hampering the exploitation of dissimilar quantum dots in protocols requiring the teleportation of quantum entanglement over remote locations. Here we introduce quantum dot-based sources of polarization-entangled photons whose energy can be tuned via three-directional strain engineering without degrading the degree of entanglement of the photon pairs. As a test-bench for quantum communication, we interface quantum dots with clouds of atomic vapours, and we demonstrate slow-entangled photons from a single quantum emitter. These results pave the way towards the implementation of hybrid quantum networks where entanglement is distributed among distant parties using optoelectronic devices.

Date: 2016
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DOI: 10.1038/ncomms10375

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