article published Michelle Lienhart author Krzysztof Gawarecki author Markus Stöcker author Frederik Bopp author Charlotte Cullip author Nadeem Akhlaq author Christopher Thalacker author Johannes Schall author Sven Rodt author Arne Ludwig author Dirk Reuter author 37763 Stephan Reitzenstein author Kai Müller author Paweł Machnikowski author Jonathan J. Finley author 15 department 230 department <jats:p> Spins confined in optically active quantum dot molecules (QDMs) can be used for the deterministic generation of photonic graph states with tailored entanglement structures. Their usefulness for the generation of such nonclassical states of light is determined by orbital and spin decoherence mechanisms, particularly phonon-mediated processes dominant at energy scales up to a few millielectronvolts. Here, we directly measure the spectral function of orbital phonon relaxation between the energy states of the neutral exciton in a QDM and benchmark our findings against microscopic <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:mi mathvariant="bold-italic">k</a:mi> <a:mo>·</a:mo> <a:mi mathvariant="bold-italic">p</a:mi> <a:mspace width="4pt"/> </a:mrow> </a:math> theory. Our results reveal pronounced resonances and antiresonances in the phonon-relaxation rates, ranging from tens of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"> <e:mrow> <e:mi>µ</e:mi> <e:msup> <e:mrow> <e:mi mathvariant="normal">s</e:mi> </e:mrow> <e:mrow> <e:mo>−</e:mo> <e:mn>1</e:mn> </e:mrow> </e:msup> </e:mrow> </e:math> up to tens of <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"> <g:msup> <g:mrow> <g:mi>ns</g:mi> </g:mrow> <g:mrow> <g:mo>−</g:mo> <g:mn>1</g:mn> </g:mrow> </g:msup> </g:math> . Comparison with a kinetic model reveals the voltage (energy) dependent phonon coupling strength and fully explains the interplay between phonon-assisted relaxation and radiative recombination. The resonances and antiresonances enable further tunability of the exciton lifetime which can be leveraged to increase the lifetime of energetically unfavorable charge configurations needed for realizing efficient spin-photon interfaces and multidimensional cluster states. </jats:p> American Physical Society (APS)2025 eng 2469-9950 2469-996910.1103/xc25-1tph 11223 M. Lienhart, K. Gawarecki, M. Stöcker, F. Bopp, C. Cullip, N. Akhlaq, C. Thalacker, J. Schall, S. Rodt, A. Ludwig, D. Reuter, S. Reitzenstein, K. Müller, P. Machnikowski, J.J. Finley, Physical Review B 112 (2025). Lienhart, Michelle, Krzysztof Gawarecki, Markus Stöcker, Frederik Bopp, Charlotte Cullip, Nadeem Akhlaq, Christopher Thalacker, et al. “Resonant and Antiresonant Exciton-Phonon Coupling in Quantum Dot Molecules.” <i>Physical Review B</i> 112, no. 23 (2025). <a href="https://doi.org/10.1103/xc25-1tph">https://doi.org/10.1103/xc25-1tph</a>. M. Lienhart <i>et al.</i>, “Resonant and antiresonant exciton-phonon coupling in quantum dot molecules,” <i>Physical Review B</i>, vol. 112, no. 23, Art. no. 235305, 2025, doi: <a href="https://doi.org/10.1103/xc25-1tph">10.1103/xc25-1tph</a>. Lienhart, M., Gawarecki, K., Stöcker, M., Bopp, F., Cullip, C., Akhlaq, N., Thalacker, C., Schall, J., Rodt, S., Ludwig, A., Reuter, D., Reitzenstein, S., Müller, K., Machnikowski, P., &#38; Finley, J. J. (2025). Resonant and antiresonant exciton-phonon coupling in quantum dot molecules. <i>Physical Review B</i>, <i>112</i>(23), Article 235305. <a href="https://doi.org/10.1103/xc25-1tph">https://doi.org/10.1103/xc25-1tph</a> @article{Lienhart_Gawarecki_Stöcker_Bopp_Cullip_Akhlaq_Thalacker_Schall_Rodt_Ludwig_et al._2025, title={Resonant and antiresonant exciton-phonon coupling in quantum dot molecules}, volume={112}, DOI={<a href="https://doi.org/10.1103/xc25-1tph">10.1103/xc25-1tph</a>}, number={23235305}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Lienhart, Michelle and Gawarecki, Krzysztof and Stöcker, Markus and Bopp, Frederik and Cullip, Charlotte and Akhlaq, Nadeem and Thalacker, Christopher and Schall, Johannes and Rodt, Sven and Ludwig, Arne and et al.}, year={2025} } Lienhart M, Gawarecki K, Stöcker M, et al. Resonant and antiresonant exciton-phonon coupling in quantum dot molecules. <i>Physical Review B</i>. 2025;112(23). doi:<a href="https://doi.org/10.1103/xc25-1tph">10.1103/xc25-1tph</a> Lienhart, Michelle, et al. “Resonant and Antiresonant Exciton-Phonon Coupling in Quantum Dot Molecules.” <i>Physical Review B</i>, vol. 112, no. 23, 235305, American Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/xc25-1tph">10.1103/xc25-1tph</a>. 656112026-05-13T06:24:29Z2026-05-15T06:13:00Z