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Frequency Feedback for Two-Photon Interference from Separate Quantum Dots

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posted on 2023-11-30, 17:43 authored by Michael Zopf, Tobias Macha, Robert Keil, Eduardo Uruñuela, Yan Chen, Wolfgang Alt, Lothar Ratschbacher, Fei Ding, Dieter Meschede, Oliver G. Schmidt
We employ active feedback to stabilize the frequency of single photons emitted by two separate quantum dots to an atomic standard. The transmission of a single, rubidium-based Faraday filter serves as the error signal for frequency stabilization to less than 1.5% of the emission linewidth. Long-term stability is demonstrated by Hong-Ou-Mandel interference between photons from the two quantum dots. The observed visibility of $V_{\mathrm{lock}}=(41 \pm 5)$% is limited only by internal dephasing of the dots. Our approach facilitates quantum networks with indistinguishable photons from distributed emitters.

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