  We study the behavior of Cooper pair amplitudes that emerge when a
two-dimensional superconductor is coupled to two parallel nanowires, focusing
on the conditions for realizing odd-frequency pair amplitudes in the absence of
spin-orbit coupling or magnetism. In general, any finite tunneling between the
superconductor and the two nanowires induces odd-frequency spin-singlet pair
amplitudes in the substrate as well as a substantial odd-frequency interwire
pairing, both of which vanish locally. Interestingly, in the regime of strong
superconductor-nanowire tunneling, we find that the presence of two nanowires
allows for the conversion of non-local odd-frequency pairing to local
even-frequency pairing. By studying this higher-order symmetry conversion
process, we are able to identify a notable effect of the odd-frequency pairing
in the superconductor on local quantities accessible by experiments.
Specifically, we find that the odd-frequency pairing plays a direct role in the
emergence of certain subgap features in the local density of states, and,
importantly, it is responsible for a reduction of the maximum Josephson current
between the two nanowires, measurable using Josephson scanning tunneling
microscopy. We discuss ways to control the sizes of these effects induced by
odd-frequency superconductivity by tuning the parameters describing the
nanowires.
