Quantum Effects in Higher-Order Correlators of a Quantum-Dot Spin Qubit

被引：27

作者：

Bechtold, A. ^{[1
,2
]}

Li, F. ^{[3
,4
]}

Mueller, K. ^{[1
,2
,5
]}

Simmet, T. ^{[1
,2
]}

Ardelt, P-L. ^{[1
,2
]}

Finley, J. J. ^{[1
,2
]}

Sinitsyn, N. A. ^{[4
]}

机构：

[1] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany

[2] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany

[3] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[5] Stanford Univ, EL Ginzton Lab, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 02期

关键词：

LEGGETT-GARG INEQUALITY; ELECTRON-SPIN; VIOLATION; MECHANICS;

D O I：

10.1103/PhysRevLett.117.027402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure time correlators of a spin qubit in an optically active quantum dot beyond the second order. Such higher-order correlators are shown to be directly sensitive to pure quantum effects that cannot be explained within the classical framework. They allow direct determination of ensemble and quantum dephasing times, T-2* and T-2, using only repeated projective measurements and without the need for coherent spin control. Our method enables studies of purely quantum behavior in solid state systems, including tests of the Leggett-Garg type of inequalities that rule out local hidden variable interpretation of the quantum-dot spin dynamics.

引用

页数：5

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