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We propose a readily achievable experimental setting where an externalmagnetic field is used to tune the emergent quantum electrodynamics (eQED) ofdipolar-octupolar quantum spin ice (DO-QSI). When the octupolar interactionsdominate, we find that a weak field tunes the DO-QSI's quantum dynamics withoutlifting the degeneracy of the low-energy ice-state manifold. This is a uniqueadvantage compared to conventional quantum spin ice. In $U(1)_\pi$ DO-QSI - theproposed ground state of QSI candidates Ce$_2$Zr$_2$O$_7$, Ce$_2$Sn$_2$O$_7$and Ce$_2$Hf$_2$O$_7$ - the field tunes the emergent speed of light (and,consequently, the emergent fine structure constant). Depending on the field'salignment with the crystal, one may induce different speeds of light for thetwo polarizations of the emergent photons, in a fascinating analogue of theelectro-optic Kerr effect. In $U(1)_0$ DO-QSI - yet to be uncoveredexperimentally - we find a number of unusual field-induced transitions,including a transition between $0$- and $\pi$-flux QSI phases, as well asphases with frustrated flux configurations. Our proposal opens the gate to aplethora of experimentally accessible, engineerable eQED phenomena in theemergent universes of quantum spin ice.

Experimentally tunable QED in dipolar-octupolar quantum spin ice