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Microelectronics Journal

Role of Cooper pairs for the generation of entangled photon pairs from single quantum dots

Ikuo Suemune, Tatsushi Akazaki, K. Tanaka, Masafumi Jo, Katsuhiro Uesugi, M. Endo, H. Kumano, Eiichi Hanamura

Published Dec 6, 2007• 6 citations
Publisher
DOI
10.1016/j.mejo.2007.07.009

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As a waveguide circuit QED architecture, we investigate theoretically the single-photon pair emission of a Cooper pair splitter composed of two double quantum dots, each coupled to a microwave transmission line. We find that this system can generate frequency-entangled photon pairs in the left and right transmission lines, specifically a superposition of two photon wave packets at different frequencies. The frequency entanglement of the two photons arises from the particle-hole coherent superposition (i.e., Andreev bound states) involving the delocalized entangled spin singlet. We also estimate a lower bound for the efficiency of entangled photon-pair generation, accounting for the presence of nonradiative processes such as phonon emissions. Our proposal is realistic and achievable with state-of-the-art techniques in quantum microwave engineering with electostatically defined semiconducting quantum dots.