@article{2018-zopf-schmidt-phys-rev-b-v98-p161302,
	Abstract = {<p>
	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 rubidium-based Faraday filter serves as the error signal for frequency stabilization. We achieve a residual frequency deviation of <30 MHz, which is less than 1.5% of the quantum dot linewidth. Long-term stability is demonstrated by Hong-Ou-Mandel interference between photons from the two quantum dots. Their internal dephasing limits the expected visibility to <em>V</em> = 40%. We observe <em>V</em><sub>lock</sub> = (41±5)% for frequency-stabilized dots as opposed to <em>V</em><sub>free</sub> = (31±7)% for free-running emission. Our technique reaches the maximally expected visibility for the given system and therefore facilitates quantum networks with indistinguishable photons from distributed sources.</p>},
	Author = {Zopf, M. AND Macha, T. AND Keil, R. AND Uruñuela, E. AND Chen, Y. AND Alt, W. AND Ratschbacher, L. AND Ding, F. AND Meschede, D. AND Schmidt, O. G.},
	Journal = {Phys. Rev. B},
	Pages = {161302},
	Title = {{Frequency feedback for two-photon interference from separate quantum dots}},
	Volume = {98},
	Year = {2018}
}