  When molecular transitions strongly couple to photon modes, they form hybrid
light-matter modes called polaritons. Collective vibrational strong coupling is
a promising avenue for control of chemistry, but this can be deterred by the
large number of quasi-degenerate dark modes. The macroscopic occupation of a
single polariton mode by excitations, as observed in Bose-Einstein
condensation, offers promise for overcoming this issue. Here we theoretically
investigate the effect of vibrational polariton condensation on the kinetics of
electron transfer processes. Compared with excitation with infrared laser
sources, the condensate changes the reaction yield significantly due to
additional channels with reduced activation barriers resulting from the large
accumulation of energy in the lower polariton, and the many modes available for
energy redistribution during the reaction. Our results offer tantalizing
opportunities to use condensates for driving chemical reactions, kinetically
bypassing usual constraints of fast intramolecular vibrational redistribution
in condensed phase.
