Abstract
We propose and analyze a new approach for quantum state transfer between
remote spin qubits. Specifically, we demonstrate that coherent quantum coupling
between remote qubits can be achieved via certain classes of random,
unpolarized spin chains. Our method is robust to coupling strength disorder and
does not require manipulation or control over individual spins. In principle,
it can be used to attain perfect state transfer over arbitrarily long range via
purely Hamiltonian evolution and may be particularly applicable in a
solid-state quantum information processor. As an example, we demonstrate that
it can be used to attain strong coherent coupling between Nitrogen-Vacancy
centers separated by micrometer distances at room temperature. Realistic
imperfections and decoherence effects are analyzed.
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