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After the landmark discovery of non-zero $\theta_{13}$ by the modern reactorexperiments, unprecedented precision on neutrino mass-mixing parameters hasbeen achieved over the past decade. This has set the stage for the discovery ofleptonic CP violation (LCPV) at high confidence level in the next-generationlong-baseline neutrino oscillation experiments. In this work, we explore indetail the possible complementarity among the on-axis DUNE and off-axis T2HKexperiments to enhance the sensitivity to LCPV suppressing the$\theta_{23}-\delta_{\mathrm{CP}}$ degeneracy. We find that none of theseexperiments individually can achieve the milestone of 3$\sigma$ LCPV for atleast 75% choices of $\delta_{\mathrm{CP}}$ in its entire range of$[-180^{\circ} , 180^{\circ}]$, with their nominal exposures and systematicuncertainties. However, their combination can attain the same for all values of$\theta_{23}$ with only half of their nominal exposures. We observe that theproposed T2HKK setup in combination with DUNE can further increase the CPcoverage to more than 80% with only half of their nominal exposures. We studyin detail how the coverage in $\delta_{\mathrm{CP}}$ for $\ge$ 3$\sigma$ LCPVdepends on the choice of $\theta_{23}$, exposure, optimal runtime in neutrinoand antineutrino modes, and systematic uncertainties in these experiments inisolation and combination. We find that with an improved systematic uncertaintyof 2.7% in appearance mode, the standalone T2HK setup can provide a CP coverageof around 75% for all values of $\theta_{23}$. We also discuss the pivotal roleof intrinsic, extrinsic, and total CP asymmetries in the appearance channel andextrinsic CP asymmetries in the disappearance channel while analyzing ourresults.

Enhancing Sensitivity to Leptonic CP Violation using Complementarity among DUNE, T2HK, and T2HKK