Non-Markovian decoherence theory for a double-dot charge qubit
By M. Tu, Wei-Min Zhang. 2008
172 citations recorded by the source corpus.
In this paper, we develop a nonperturbation theory for describing decoherence dynamics of electron charges in a double quantum dot gated by electrodes. We extend the Feynman-Vernon influence functional theory to fermionic environments and derive an exact master equation for the reduced density matrix of electrons in the double dot for a general spectral density at arbitrary temperature and bias. We then investigate the decoherence dynamics of the double-dot charge qubit with backreaction of the reservoirs being fully taken into account. Time-dependent fluctuations and leakage effects induced from the dot-reservoir coupling are explicitly explored. The charge qubit dynamics from the Markovian to non-Markovian regime is systematically studied under various manipulating conditions. The decay behavior of charge qubit coherence and the corresponding relaxation time T{sub 1} and dephasing time T{sub 2} are analyzed in detail.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/36fefa89064eeb2966a5d5786cf3f71705929d17
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Dynamics of non-Markovian open quantum systems (2015, background): “Following a more recent derivation by An et al. (2009); An and Zhang (2007); Jin et al. (2010); and Tu and Zhang (2008b) this equation reads as dρs(t) dt = −i∆(t)[a†a, ρs(t)] + γ1(t)(2aρs(t)a† − a†aρs(t)− ρs(t)a†a) + γ2(t)(±aρs(t)a† + a†ρs(t)a − a†aρs(t)∓ ρs(t)aa†), where ∆(t) and γ1(t) are given…”