Quantum Hall (QH) and quantum spin Hall (QSH) phases have very different edge states and, when go... more Quantum Hall (QH) and quantum spin Hall (QSH) phases have very different edge states and, when going from one phase to the other, the direction of one edge state must be reversed. In graphene, the peculiar" relativistic" nature of the Quantum Hall effect (with its two Landau levels pinned at the Dirac point) allows to have the QH and the QSH phases sharing the same spectrum, which itself opens the possibility for, say, QH-QSH transitions induced by a gate voltage. In the first part of this talk, I will discuss a proposition to induce ...
Motivated by recent experiments with Josephson qubits we propose a new phenomenological model for... more Motivated by recent experiments with Josephson qubits we propose a new phenomenological model for /f noise due to collective excitations of interacting defects in the qubit's environment. At very low temperatures the effective dynamics of these collective modes are very slow leading to pronounced non-Gaussian features and nonstationarity of the noise. We analyze the influence of this noise on the dynamics of a qubit in various regimes and at different operation points. Remarkable predictions are absolute time dependences of a critical coupling and of dephasing in the strong coupling regime.
Quantum Hall (QH) and quantum spin Hall (QSH) phases have very different edge states and, when go... more Quantum Hall (QH) and quantum spin Hall (QSH) phases have very different edge states and, when going from one phase to the other, the direction of one edge state must be reversed. In graphene, the peculiar" relativistic" nature of the Quantum Hall effect (with its two Landau levels pinned at the Dirac point) allows to have the QH and the QSH phases sharing the same spectrum, which itself opens the possibility for, say, QH-QSH transitions induced by a gate voltage. In the first part of this talk, I will discuss a proposition to induce ...
Motivated by recent experiments with Josephson qubits we propose a new phenomenological model for... more Motivated by recent experiments with Josephson qubits we propose a new phenomenological model for /f noise due to collective excitations of interacting defects in the qubit's environment. At very low temperatures the effective dynamics of these collective modes are very slow leading to pronounced non-Gaussian features and nonstationarity of the noise. We analyze the influence of this noise on the dynamics of a qubit in various regimes and at different operation points. Remarkable predictions are absolute time dependences of a critical coupling and of dephasing in the strong coupling regime.
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