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- W2099332956 abstract "Motivated by some recent results of quantum control theory, we discuss the feasibility of local operator control in arrays of interacting qubits modeled as isotropic Heisenberg spin chains. Acting on one of the end spins, we aim at finding piecewise-constant control pulses that lead to optimal fidelities for a chosen set of quantum gates. We analyze the robustness of the obtained results f or the gate fidelities to random errors in the control fields, finding that with faster switching between piecewise-constant controls the system is less susceptible to these errors. The observed behavior falls into a generic class of physical phenomena that are related to a competition between resonance- and relaxation-type behavior, exemplified by motional narrowing in NMR experiments. Finally, we discuss how the obtained optimal gate fidelities are altered when the corresponding rapidly-varying piecewise-constant control fields are smoothened through spectral filtering." @default.
- W2099332956 created "2016-06-24" @default.
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- W2099332956 date "2010-11-29" @default.
- W2099332956 modified "2023-09-23" @default.
- W2099332956 title "Local quantum control of Heisenberg spin chains" @default.
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- W2099332956 doi "https://doi.org/10.1103/physreva.82.052333" @default.
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