  Our study demonstrates successful error mitigation of
indistinguishability-related noise in a quantum photonic processor through the
application of the zero-noise extrapolation technique. By measuring observable
values at different error levels, we were able to extrapolate towards a
noise-free regime. We examined the impact of partial distinguishability of
photons in a two-qubit processor implementing the variational quantum
eigensolver for a Schwinger Hamiltonian. Our findings highlight the
effectiveness of the extrapolation technique in mitigating
indistinguishability-related noise and improving the accuracy of Hamiltonian
eigenvalue estimation.
