SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.63: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Quantum frequency conversion of entangled photon pair from GaAs Quantum dot to Sn-vacancy center in Diamond — •Ankita Choudhary, Tim Pokart, Nand lal Sharma, Moritz Langer, and Caspar Hopfmann — Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraβe 20, 01069 Dresden, Germany

The distribution of entangled photons in future long-distance quantum networks requires both on-demand and high-fidelity entangled photon pair generation as well as their temporary storage in low dephasing quantum memory systems. While GaAs quantum dots have proven to be excellent entangled photon pair sources, this is system suffers from strong dephasing of its spin qubits. Diamond color centers on the other hand are excellent quantum memories, but not ideal entangled photon pair sources. In order to combine the complementary properties of both material system in a hybrid quantum network approach, the efficient conversion between the operating photon energies without the loss of quantum information using quantum frequency conversion is required. In this study we present quantum frequency conversion from of 780nm to 619nm, i.e. from GaAs quantum dot emission to the zero-phonon line of the diamond Sn vacancy center, using sum frequency generation in a periodically poled lithium niobate crystal and an infrared laser pump of about 3 *m wavelength. We find that a conversion efficiency of at least 25% can be achieved.