期刊
PHYSICAL REVIEW B
卷 93, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.235428
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资金
- EPSRC [EP/J015067/1]
- Templeton World Charity Foundation
- Marie Curie Career Integration Grant
- Royal Society of Edinburgh
- Scottish Government
- Royal Academy of Engineering
- EPSRC [EP/N017188/1, EP/J015067/1, EP/H001972/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N017188/1, EP/H001972/1, EP/J015067/1] Funding Source: researchfish
We report microwave-driven photon-assisted tunneling in a suspended carbon nanotube double quantum dot. From the resonant linewidth at a temperature of 13 mK, the charge-dephasing time is determined to be 280 +/- 30 ps. The linewidth is independent of driving frequency, but increases with increasing temperature. The moderate temperature dependence is inconsistent with expectations from electron-phonon coupling alone, but consistent with charge noise arising in the device. The extracted level of charge noise is comparable with that expected from previous measurements of a valley-spin qubit, where it was hypothesized to be the main cause of qubit decoherence. Our results suggest a possible route towards improved valley-spin qubits.
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