  We investigate the Wigner distributions of $\bar{u}$ and $\bar{d}$ quarks in
a proton using the overlap representation within the light cone formalism.
Using the light cone wave functions which are obtained from the baryon-meson
fluctuation model in terms of the $|q\bar{q}B\rangle$ Fock states, we calculate
the Wigner distributions for the unpolarized/longitudinally polarized sea quark
in an unpolarized/longitudinally polarized proton. The Wigner distributions can
be obtained through a Fourier transform on the generalized transverse-momentum
dependent parton distributions (GTMDs). We also calculate the GTMDs of
$\bar{u}$ and $\bar{d}$ quarks in the intermediate step. Numerical results for
the Wigner distributions of $\bar{u}$ and $\bar{d}$ quarks in transverse
momentum space, impact parameter space and the mixed plane are presented. We
also study the orbital angular momentum and the spin-orbit correlations of the
sea quarks.
