Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric g Tensor Control and Spin Echo of a Hole-Spin Qubit in a
  Quantum Dot Molecule   The feasibility of high-fidelity single-qubit operations of a hole spin in a
quantum dot molecule by electric g tensor control is demonstrated. Apart from a
constant external magnetic field the proposed scheme allows for an exclusively
electric control of the hole spin. Realistic electric gate bias profiles are
identified for various qubit operations using process-tomography-based optimal
control. They are shown to be remarkably robust against decoherence and
dissipation arising from the interaction of the hole with host-lattice nuclear
spins and phonons, with a fidelity loss of $\approx$ 1 percent for gate
operation times of $\approx 10$ ns. Spin-echo experiments for the hole spin are
modeled to explore dephasing mechanisms and the role of pulse-timing
imperfections on the gate fidelity loss is discussed.

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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph