Homodyne detection of coherence and phase shift of a quantum dot in a cavity

A homodyne measurement technique is demonstrated that enables direct observation of the coherence and phase of light that passed through a coupled quantum dot (QD)-microcavity system, which in turn enables clear identification of coherent and incoherent QD transitions. As an example, we study the ef...

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Bibliographic Details
Published in:Optics letters 2015-07, Vol.40 (13), p.3173-3176
Main Authors: Bakker, Morten P, Snijders, Henk, Löffler, Wolfgang, Barve, Ajit V, Coldren, Larry A, Bouwmeester, Dirk, van Exter, Martin P
Format: Article
Language:English
Subjects:
Coherence
Emission analysis
Holes
Phase shift
Phase transformations
Quantum dots
Quantum electrodynamics
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Summary:A homodyne measurement technique is demonstrated that enables direct observation of the coherence and phase of light that passed through a coupled quantum dot (QD)-microcavity system, which in turn enables clear identification of coherent and incoherent QD transitions. As an example, we study the effect of power-induced decoherence, where the QD transition saturates and incoherent emission from the excited state dominates at higher power. Further, we show that the same technique allows measurement of the quantum phase shift induced by a single QD in the cavity, which is strongly enhanced by cavity quantum electrodynamics effects.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.003173