Quantum spectroscopy with Schrödinger-cat states

Laser-spectroscopic techniques that exploit light-matter entanglement promise access to many-body configurations. Their practical implementation, however, is hindered by the large number of coupled states involved. Here, we introduce a scheme to deal with this complexity by combining quantitative ex...

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Bibliographic Details
Published inNature physics Vol. 7; no. 10; pp. 799 - 804
Main Authors Kira, M., Koch, S. W., Smith, R. P., Hunter, A. E., Cundiff, S. T.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group 01.10.2011
Subjects
Absorption
Clusters
Compressing
Condensed matter physics
Entanglement
Excitons
Lasers
Quantum physics
Quantum wells
Semiconductors
Spectroscopy
Spectrum analysis
Theoretical analysis
Transformations
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Summary:Laser-spectroscopic techniques that exploit light-matter entanglement promise access to many-body configurations. Their practical implementation, however, is hindered by the large number of coupled states involved. Here, we introduce a scheme to deal with this complexity by combining quantitative experiments with theoretical analysis. We analyse the absorption properties of semiconductor quantum wells and present a converging cluster-expansion transformation that robustly projects a large set of quantitative classical measurements onto the true quantum responses. Classical and quantum sources are shown to yield significantly different results; Schrödinger-cat states can enhance the signal by an order of magnitude. Moreover, squeezing of the source can help to individually control and characterize excitons, biexcitons and electron-hole complexes. [PUBLICATION ABSTRACT]
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ISSN:1745-2473
1745-2481
DOI:10.1038/nphys2091