Extending the coherence of a quantum dot hybrid qubit
| Autor: | Thorgrimsson, Brandur, Kim, Dohun, Yang, Yuan-Chi, Smith, L. W., Simmons, C. B., Ward, Daniel R., Foote, Ryan H., Corrigan, J., Savage, D. E., Lagally, M. G., Friesen, Mark, Coppersmith, S. N., Eriksson, M. A. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | npj Quantum Information 3, Article number: 32 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41534-017-0034-2 |
| Popis: | Identifying and ameliorating dominant sources of decoherence are important steps in understanding and improving quantum systems. Here we show that the free induction decay time ($T_{2}^{*}$) and the Rabi decay rate ($\Gamma_{\mathrm{Rabi}}$) of the quantum dot hybrid qubit can be increased by more than an order of magnitude by appropriate tuning of the qubit parameters and operating points. By operating in the spin-like regime of this qubit, and choosing parameters that increase the qubit's resilience to charge noise (which we show is presently the limiting noise source for this qubit), we achieve a Ramsey decay time $T_{2}^{*}$ of $177~\mathrm{ns}$ and a Rabi decay time, $1/\Gamma_{\mathrm{Rabi}}$, exceeding $1~\mathrm{\mu s}$. We find that the slowest $\Gamma_{\mathrm{Rabi}}$ is limited by fluctuations in the Rabi frequency induced by charge noise and not by fluctuations in the qubit energy itself. Comment: 10 pages, 6 figures. Supplementary material is included as appendices |
| Databáze: | arXiv |
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