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The Heisenberg exchange interaction between neighboring quantum dots allowsprecise voltage control over spin dynamics, due to the ability to preciselycontrol the overlap of orbital wavefunctions by gate electrodes. This allowsthe study of fundamental electronic phenomena and finds applications in quantuminformation processing. Although spin-based quantum circuits based onshort-range exchange interactions are possible, the development of scalable,longer-range coupling schemes constitutes a critical challenge within thespin-qubit community. Approaches based on capacitative coupling andcavity-mediated interactions effectively couple spin qubits to the chargedegree of freedom, making them susceptible to electrically-induced decoherence.The alternative is to extend the range of the Heisenberg exchange interactionby means of a quantum mediator. Here, we show that a multielectron quantum dotwith 50-100 electrons serves as an excellent mediator, preserving speed andcoherence of the resulting spin-spin coupling while providing severalfunctionalities that are of practical importance. These include speed (mediatedtwo-qubit rates up to several gigahertz), distance (of order of a micrometer),voltage control, possibility of sweet spot operation (reducing susceptibilityto charge noise), and reversal of the interaction sign (useful for dynamicaldecoupling from noise).

Fast spin exchange between two distant quantum dots