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We revisit here the lowest vertical excitations of cyanine dyes using quantumMonte Carlo and leverage on recent developments to systematically improve onprevious results. In particular, we employ a protocol for the construction ofcompact and accurate multi-determinant Jastrow-Slater wave functions formultiple states, which we have recently validated on the excited-stateproperties of several small prototypical molecules. Here, we obtain quantumMonte Carlo excitation energies in excellent agreement with high-level coupledcluster for all the cyanines where the coupled cluster method is applicable.Furthermore, we push our protocol to longer chains, demonstrating that quantumMonte Carlo is a viable methodology to establish reference data at system sizeswhich are hard to reach with other high-end approaches of similar accuracy.Finally, we determine which ingredients are key to an accurate treatment ofthese challenging systems and rationalize why a description of the excitationbased on only active $\pi$ orbitals lacks the desired accuracy for the shorterchains.

Reference excitation energies of increasingly large molecules: a QMC study of cyanine dyes