Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter

Michele Governale; Christian Schönenberger; Pasquale Scarlino; Gianluca Rastelli

doi:10.1103/PRXQuantum.6.020339

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Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter

Michele Governale, Christian Schönenberger, Pasquale Scarlino, Gianluca Rastelli

DOI 10.1103/PRXQuantum.6.020339 · PRX Quantum

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Abstract

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.