The production of quantum states required for use in quantum protocols & technologies is studied by developing the tools to re-engineer a perfect state transfer spin chain so that a separable input excitation is output over multiple sites. We concentrate in particular on cases where the excitation is superposed over a small subset of the qubits on the spin chain, known as fractional revivals, demonstrating that spin chains are capable of producing a far greater range of fractional revivals than previously known, at high speed. We also provide a numerical technique for generating chains that produce arbitrary single-excitation states, such as the W state.
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 A. Kay. Perfect Revivals on Spin Chains. https://figshare.com/articles/Perfect_Revivals_on_Spin_Chains/4110033, (2016). 10.6084/m9.figshare.4110033.v1.
 Alastair Kay, "Coprocessors for quantum devices", Physical Review A 97 3, 032316 (2018).
 Alastair Kay, "Perfect coding for dephased quantum state transfer", Physical Review A 97 3, 032317 (2018).
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