Evaluating charge noise acting on semiconductor quantum dots in the circuit quantum electrodynamics architecture
| Autor: | Basset, Julien, Stockklauser, Anna, Jarausch, David-Dominik, Frey, Tobias, Reichl, Christian, Wegscheider, Werner, Wallraff, Andreas, Ensslin, Klaus, Ihn, Thomas |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Appl. Phys. Lett. 105, 063105 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4892828 |
| Popis: | We evaluate the charge noise acting on a GaAs/GaAlAs based semiconductor double quantum dot dipole-coupled to the voltage oscillations of a superconducting transmission line resonator. The in-phase ($I$) and the quadrature ($Q$) components of the microwave tone transmitted through the resonator are sensitive to charging events in the surrounding environment of the double dot with an optimum sensitivity of $8.5\times10^{-5} \mbox{e}/\sqrt{\mbox{Hz}}$. A low frequency $1/f$ type noise spectrum combined with a white noise level of $6.6\times10^{-6}$ $\mbox{e}^2/\mbox{Hz}$ above $1$ Hz is extracted, consistent with previous results obtained with quantum point contact charge detectors on similar heterostructures. The slope of the $1/f$ noise allows to extract a lower bound for the double-dot charge qubit dephasing rate which we compare to the one extracted from a Jaynes-Cummings Hamiltonian approach. The two rates are found to be similar emphasizing that charge noise is the main source of dephasing in our system. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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