Insulating magnetic rare-earth pyrochlores related to spin ice host emergent bosonic monopolar spinons, which obey a magnetic analogue of quantum electrodynamics and may open a route to spinonics. However, the energy scales of the interactions among rare-earth moments are so low ($\sim$ 1 K) that the possible quantum coherence can be achieved at a sub-Kelvin scale. Here, we design high-temperature quantum spin ice materials from first principles. It is shown that the $A$-site deintercalated spinel iridate ${\mathrm{Ir}}_2{\mathrm{O}}_4$, which has been experimentally grown as epitaxial thin films, is a promising candidate for quantum spin ice with a spin-ice-rule interaction of a few tens of meV. Controlling electronic structures of ${\mathrm{Ir}}_2{\mathrm{O}}_4$ through substrates, it is possible to tune magnetic interactions so that a magnetic Coulomb liquid persists at high temperatures.

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• Spin ice
• Iridates
• Mott insulators
• First-principles calculations