Physics – Quantum Physics
Scientific paper
2010-07-15
Phys. Rev. A 82, 052333 (2010)
Physics
Quantum Physics
final, published version
Scientific paper
10.1103/PhysRevA.82.052333 10.11
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.
Bruder Christoph
Burgarth Daniel
Heule Rahel
Stojanovic Vladimir M.
No associations
LandOfFree
Local quantum control of Heisenberg spin chains does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Local quantum control of Heisenberg spin chains, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local quantum control of Heisenberg spin chains will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-599530