A solid state source of photon triplets based on quantum dot molecules

Milad Khoshnegar (), Tobias Huber, Ana Predojević, Dan Dalacu, Maximilian Prilmüller, Jean Lapointe, Xiaohua Wu, Philippe Tamarat, Brahim Lounis, Philip Poole, Gregor Weihs and Hamed Majedi
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Milad Khoshnegar: University of Waterloo
Tobias Huber: Institut für Experimentalphysik, Universität Innsbruck
Ana Predojević: Institut für Experimentalphysik, Universität Innsbruck
Dan Dalacu: National Research Council of Canada
Maximilian Prilmüller: Institut für Experimentalphysik, Universität Innsbruck
Jean Lapointe: National Research Council of Canada
Xiaohua Wu: National Research Council of Canada
Philippe Tamarat: Université Bordeaux, LP2N Institut d’Optique and CNRS
Brahim Lounis: Université Bordeaux, LP2N Institut d’Optique and CNRS
Philip Poole: National Research Council of Canada
Gregor Weihs: Institute for Quantum Computing, University of Waterloo
Hamed Majedi: University of Waterloo

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Producing advanced quantum states of light is a priority in quantum information technologies. In this context, experimental realizations of multipartite photon states would enable improved tests of the foundations of quantum mechanics as well as implementations of complex quantum optical networks and protocols. It is favourable to directly generate these states using solid state systems, for simpler handling and the promise of reversible transfer of quantum information between stationary and flying qubits. Here we use the ground states of two optically active coupled quantum dots to directly produce photon triplets. The formation of a triexciton in these ground states leads to a triple cascade recombination and sequential emission of three photons with strong correlations. We record 65.62 photon triplets per minute under continuous-wave pumping, surpassing rates of earlier reported sources. Our structure and data pave the way towards implementing multipartite photon entanglement and multi-qubit readout schemes in solid state devices.

Date: 2017
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DOI: 10.1038/ncomms15716

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