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Implementing the fanout gate by a Hamiltonian
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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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Shor's algorithm requires Fanout
Constant-depth quantum Fourier transform is possible iff constant-depth fanout is possible.
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