Quantum coherence induces pulse shape modification in a semiconductor optical amplifier at room temperature.

Abstract:

:Coherence in light-matter interaction is a necessary ingredient if light is used to control the quantum state of a material system. Coherent effects are firmly associated with isolated systems kept at low temperature. The exceedingly fast dephasing in condensed matter environments, in particular at elevated temperatures, may well erase all coherent information in the material at timescales shorter than a laser excitation pulse. Here we show for an ensemble of semiconductor quantum dots that even in the presence of ultrafast dephasing, for suitably designed condensed matter systems quantum-coherent effects are robust enough to be observable at room temperature. Our conclusions are based on an analysis of the reshaping an ultrafast laser pulse undergoes on propagation through a semiconductor quantum dot amplifier. We show that this pulse modification contains the signature of coherent light-matter interaction and can be controlled by adjusting the population of the quantum dots via electrical injection.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kolarczik M,Owschimikow N,Korn J,Lingnau B,Kaptan Y,Bimberg D,Schöll E,Lüdge K,Woggon U

doi

10.1038/ncomms3953

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2953

issn

2041-1723

pii

ncomms3953

journal_volume

4

pub_type

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