Single-Shot Spin Readout in Graphene Quantum Dots

被引：29

作者：

Gaechter, Lisa Maria ^{[1
]}

Garreis, Rebekka ^{[1
]}

Gerber, Jonas Daniel ^{[1
]}

Ruckriegel, Max Josef ^{[1
]}

Tong, Chuyao ^{[1
]}

Kratochwil, Benedikt ^{[1
]}

de Vries, Folkert Kornelis ^{[1
]}

Kurzmann, Annika ^{[1
]}

Watanabe, Kenji ^{[2
]}

Taniguchi, Takashi ^{[2
]}

Ihn, Thomas ^{[1
]}

Ensslin, Klaus ^{[1
]}

Huang, Wister Wei ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[2] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

来源：

PRX QUANTUM | 2022年 / 3卷 / 02期

基金：

瑞士国家科学基金会;

关键词：

ELECTRON-SPIN; QUBIT; NOISE;

D O I：

10.1103/PRXQuantum.3.020343

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electrostatically defined quantum dots in bilayer graphene offer a promising platform for spin qubits with presumably long coherence times due to low spin-orbit coupling and low nuclear spin density. We demonstrate two different experimental approaches to measure the decay times of excited states. The first is based on direct current measurements through the quantum device. Pulse sequences are applied to control the occupation of ground and excited states. We observe a lower bound for the excited state decay on the order of a hundred microseconds. The second approach employs a capacitively coupled charge sensor to study the time dynamics of the excited state using the Elzerman technique. We perform single-shot readout of our two-level system with a signal-to-noise ratio of about 7 and find relaxation times up to 50 ms for the spin-excited state, with a strong magnetic field dependence, promising even higher values for smaller magnetic fields. This is an important step for developing a quantum-information processor in graphene.

引用

页数：7

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