Tunable Hybrid Qubit in a GaAs Double Quantum Dot
| Autor: | Guo-Ping Guo, Xiang-Xiang Song, Hong-Wen Jiang, Bao-Bao Chen, Bao-Chuan Wang, Guo-Dong Yu, Xuedong Hu, Hai-Ou Li, Ming Xiao, Guang-Can Guo, Gang Cao |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Larmor precession Flux qubit Charge qubit Condensed Matter - Mesoscale and Nanoscale Physics General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Quantum Physics 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Phase qubit Computer Science::Emerging Technologies Qubit Quantum mechanics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Qutrit 010306 general physics 0210 nano-technology Quantum Coherence (physics) |
| DOI: | 10.48550/arxiv.1510.00895 |
| Popis: | We experimentally demonstrate a tunable hybrid qubit in a five-electron GaAs double quantum dot. The qubit is encoded in the (1,4) charge regime of the double dot and can be manipulated completely electrically. More importantly, dot anharmonicity leads to quasiparallel energy levels and a new anticrossing, which help preserve quantum coherence of the qubit and yield a useful working point. We have performed Larmor precession and Ramsey fringe experiments near the new working point and find that the qubit decoherence time is significantly improved over a charge qubit. This work shows a new way to encode a semiconductor qubit that is controllable and coherent. |
| Databáze: | OpenAIRE |
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