Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates

被引：284

作者：

Hanson, R ^{[1
]}

van Beveren, LHW ^{[1
]}

Vink, IT ^{[1
]}

Elzerman, JM ^{[1
]}

Naber, WJM ^{[1
]}

Koppens, FHL ^{[1
]}

Kouwenhoven, LP ^{[1
]}

Vandersypen, LMK ^{[1
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.94.196802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a method for reading out the spin state of electrons in a quantum dot that is robust against charge noise and can be used even when the electron temperature exceeds the energy splitting between the states. The spin states are first correlated to different charge states using a spin dependence of the tunnel rates. A subsequent fast measurement of the charge on the dot then reveals the original spin state. We experimentally demonstrate the method by performing readout of the two-electron spin states, achieving a single-shot visibility of more than 80%. We find very long triplet-to-singlet relaxation times (up to several milliseconds), with a strong dependence on the in-plane magnetic field.

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页数：4

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