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

A. Bechtold, F. Li, K. Müller, T. Simmet, P. L. Ardelt, J. J. Finley, N. A. Sinitsyn

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

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, T2∗ and T2, 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.

Original languageEnglish
Article number027402
JournalPhysical Review Letters
Volume117
Issue number2
DOIs
StatePublished - 6 Jul 2016

Fingerprint

Dive into the research topics of 'Quantum Effects in Higher-Order Correlators of a Quantum-Dot Spin Qubit'. Together they form a unique fingerprint.

Cite this