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When single-particle dynamics are suppressed in certain strongly correlatedsystems, dipoles arise as elementary carriers of quantum kinetics. Thesedipoles can further condense, providing physicists with a rich realm to studyfracton phases of matter. Whereas recent theoretical discoveries have shownthat an unconventional lattice model may host a dipole condensate as the groundstate, fundamental questions arise as to whether dipole condensation is ageneric phenomenon rather than a specific one unique to a particular model andwhat new quantum macroscopic phenomena a dipole condensate may bring us with.Here, we show that dipole condensates prevail in bosonic systems. Because of aself-proximity effect, where single-particle kinetics inevitably induces afinite order parameter of dipoles, dipole condensation readily occurs inconventional normal phases of bosons. Our findings allow experimentalists tomanipulate the phase of a dipole condensate and deliver dipolar Josephsoneffects, where supercurrents of dipoles arise in the absence of particle flows.The self-proximity effects can also be utilized to produce a generic multipolarcondensate. The kinetics of the $n$-th order multipoles unavoidably creates acondensate of the $(n+1)$-th order multipoles, forming a hierarchy ofmultipolar condensates that will offer physicists a whole new class ofmacroscopic quantum phenomena.

Multipolar condensates and multipolar Josephson effects