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Implementing the fanout gate by a Hamiltonian

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arxiv quant-ph/0309163 v1 pith:W7S7JI7Q submitted 2003-09-23 quant-ph

classification quant-ph
keywords gatehamiltonianevolvingfanoutqubitqubitsaccordingcomputation
verification ladder T0 review T1 audit T2 compute T3 formal
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We show that, for even n, evolving n qubits according to a simple Hamiltonian can be used to exactly implement an (n+1)-qubit parity gate, which is equivalent in constant depth to an (n+1)-qubit fanout gate. We also observe that evolving the Hamiltonian for three qubits results in an inversion-on-three-way-equality gate, which together with single-qubit operations is universal for quantum computation.

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  1. Shor's algorithm requires Fanout

    quant-ph 2026-08 conditional novelty 7.0 of 10

    Constant-depth quantum Fourier transform is possible iff constant-depth fanout is possible.

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