Dephasing of a Qubit due to Quantum and Classical Noise

Details Dephasing of a Qubit due to Quantum and Classical Noise Dephasing of a Qubit due to Quantum and Classical Noise

2011-03-16

arxiv.org/abs/1103.3091v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 8 figures

Scientific paper

The qubit (or a system of two quantum dots) has become a standard paradigm for studying quantum information processes. Our focus is Decoherence due to interaction of the qubit with its environment, leading to noise. We consider quantum noise generated by a dissipative quantum bath. A detailed comparative study with the results for a classical noise source such as generated by a telegraph process, enables us to set limits on the applicability of this process vis a vis its quantum counterpart, as well as lend handle on the parameters that can be tuned for analyzing decoherence. Both Ohmic and non-Ohmic dissipations are treated and appropriate limits are analyzed for facilitating comparison with the telegraph process.

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