Physics – Quantum Physics
Scientific paper
2007-01-23
Physics
Quantum Physics
9 pages, 8 figures
Scientific paper
10.1103/PhysRevA.76.012302
We demonstrate how using two-qubit composite rotations a high fidelity controlled-NOT (CNOT) gate can be constructed, even when the strength of the interaction between qubits is not accurately known. We focus on the exchange interaction oscillation in silicon based solid-state architectures with a Heisenberg Hamiltonian. This method easily applies to a general two-qubit Hamiltonian. We show how the robust CNOT gate can achieve a very high fidelity when a single application of the composite rotations is combined with a modest level of Hamiltonian characterisation. Operating the robust CNOT gate in a suitably characterised system means concatenation of the composite pulse is unnecessary, hence reducing operation time, and ensuring the gate operates below the threshold required for fault-tolerant quantum computation.
Hill Charles D.
Hollenberg Lloyd C. L.
Testolin M. J.
Wellard Cameron J.
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