Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Quantum Oscillations in a Silicon Charge Qubit   Fast quantum oscillations of a charge qubit in a double quantum dot
fabricated in a Si/SiGe heterostructure are demonstrated and characterized
experimentally. The measured inhomogeneous dephasing time T2* ranges from 127ps
to ~2.1ns; it depends substantially on how the energy difference of the two
qubit states varies with external voltages, consistent with a decoherence
process that is dominated by detuning noise(charge noise that changes the
asymmetry of the qubit's double-well potential). In the regime with the
shortest T2*, applying a charge-echo pulse sequence increases the measured
inhomogeneous decoherence time from 127ps to 760ps, demonstrating that
low-frequency noise processes are an important dephasing mechanism.

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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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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: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat