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We propose that the CP violating phase in the CKM mixing matrix is identicalto the CP phases responsible for the spontaneous CP violation in the Higgspotential. A specific multi-Higgs model with Peccei-Quinn (PQ) symmetry isconstructed to realize this idea. The CP violating phase does not vanish whenall Higgs masses become large. There are flavor changing neutral current (FCNC)interactions mediated by neutral Higgs bosons at the tree level. However,unlike general multi-Higgs models, the FCNC Yukawa couplings are fixed in termsof the quark masses and CKM mixing angles. Implications for meson-anti-mesonmixing, including recent data on $D-\bar D$ mixing, and neutron electric dipolemoment (EDM) are studied. We find that the neutral Higgs boson masses can be atthe order of one hundred GeV. The neutron EDM can be close to the presentexperimental upper bound.

Spontaneous CP Violating Phase as The CKM Matrix Phase