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The implementation of a functional quantum computer involves entangling andcoherent manipulation of a large number of qubits. For qubits based on electronspins confined in quantum dots, which are among the most investigatedsolid-state qubits at present, architectural challenges are often encounteredin the design of quantum circuits attempting to assemble the qubits within thevery limited space available. Here, we provide a solution to such challengesbased on an approach to realizing entanglement of spin qubits over longdistances. We show that long-range Ruderman-Kittel-Kasuya-Yosida interaction ofconfined electron spins can be established by quantum Hall edge states, leadingto an exchange coupling of spin qubits. The coupling is anisotropic and can beeither Ising-type or XY-type, depending on the spin polarization of the edgestate. Such a property, combined with the dependence of the electron spinsusceptibility on the chirality of the edge state, can be utilized to gainvaluable insights into the topological nature of various quantum Hall states.

Long-Distance Entanglement of Spin Qubits via Quantum Hall Edge States