article published René Pollmann author 78890 Franz Roeder author 88149 Christine Silberhorn author 26263 Benjamin Brecht author 271500000-0003-4140-0556 623 department 15 department We introduce a method for determining the sensitivity of any given entangled two-photon absorption (ETPA) measurement. By modeling all signal and noise contributions to the measurement, we derive a single numerical value that describes the sensitivity of the ETPA measurement in Göppert-Mayer units. This allows us to directly compare vastly different experimental approaches and determine whether ETPA will be detectable under the given conditions. Therefore we can quantify the effect of any change to a given experimental apparatus and identify the ideal optimization pathway. American Physical Society (APS)2026 eng 2469-9926 2469-993410.1103/qpb1-hk5l 1141 R. Pollmann, F. Roeder, C. Silberhorn, B. Brecht, Physical Review A 114 (2026). Pollmann, René, Franz Roeder, Christine Silberhorn, and Benjamin Brecht. “Limitations of Entangled Two-Photon Absorption Detection.” <i>Physical Review A</i> 114, no. 1 (2026). <a href="https://doi.org/10.1103/qpb1-hk5l">https://doi.org/10.1103/qpb1-hk5l</a>. R. Pollmann, F. Roeder, C. Silberhorn, and B. Brecht, “Limitations of entangled two-photon absorption detection,” <i>Physical Review A</i>, vol. 114, no. 1, Art. no. 013718, 2026, doi: <a href="https://doi.org/10.1103/qpb1-hk5l">10.1103/qpb1-hk5l</a>. Pollmann, R., Roeder, F., Silberhorn, C., &#38; Brecht, B. (2026). Limitations of entangled two-photon absorption detection. <i>Physical Review A</i>, <i>114</i>(1), Article 013718. <a href="https://doi.org/10.1103/qpb1-hk5l">https://doi.org/10.1103/qpb1-hk5l</a> @article{Pollmann_Roeder_Silberhorn_Brecht_2026, title={Limitations of entangled two-photon absorption detection}, volume={114}, DOI={<a href="https://doi.org/10.1103/qpb1-hk5l">10.1103/qpb1-hk5l</a>}, number={1013718}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Pollmann, René and Roeder, Franz and Silberhorn, Christine and Brecht, Benjamin}, year={2026} } Pollmann R, Roeder F, Silberhorn C, Brecht B. Limitations of entangled two-photon absorption detection. <i>Physical Review A</i>. 2026;114(1). doi:<a href="https://doi.org/10.1103/qpb1-hk5l">10.1103/qpb1-hk5l</a> Pollmann, René, et al. “Limitations of Entangled Two-Photon Absorption Detection.” <i>Physical Review A</i>, vol. 114, no. 1, 013718, American Physical Society (APS), 2026, doi:<a href="https://doi.org/10.1103/qpb1-hk5l">10.1103/qpb1-hk5l</a>. 665832026-07-24T10:53:18Z2026-07-24T11:00:08Z