The paper investigates the spin-orbit correlations of quarks and gluons in the Color Glass Condensate (CGC) at small-$x$. The authors compute these correlations and find that the helicity and orbital angular momentum (OAM) of individual partons are strongly anti-aligned, even in unpolarized or spinless hadrons and nuclei. This anti-correlation is significant because it indicates that the helicity and OAM of single gluons are maximally entangled in a quantum mechanical sense. The study uses the eikonal approximation and shows that the spin-orbit correlation grows strongly with decreasing $x$, eventually saturating. The authors also demonstrate that this anti-correlation exists in both the Weiszäcker-Williams (WW) distribution and the dipole distribution of gluons. For quarks, the analysis is more complex but follows a similar strategy. The paper concludes by discussing the implications of this entanglement for the understanding of the CGC and its potential experimental verification.The paper investigates the spin-orbit correlations of quarks and gluons in the Color Glass Condensate (CGC) at small-$x$. The authors compute these correlations and find that the helicity and orbital angular momentum (OAM) of individual partons are strongly anti-aligned, even in unpolarized or spinless hadrons and nuclei. This anti-correlation is significant because it indicates that the helicity and OAM of single gluons are maximally entangled in a quantum mechanical sense. The study uses the eikonal approximation and shows that the spin-orbit correlation grows strongly with decreasing $x$, eventually saturating. The authors also demonstrate that this anti-correlation exists in both the Weiszäcker-Williams (WW) distribution and the dipole distribution of gluons. For quarks, the analysis is more complex but follows a similar strategy. The paper concludes by discussing the implications of this entanglement for the understanding of the CGC and its potential experimental verification.