Journal
NATURE PHYSICS
Volume 7, Issue 10, Pages 799-804Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nphys2091
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Funding
- Deutsche Forschungsgemeinschaft
- NSF
- NIST
- Alexander von Humboldt Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1125844] Funding Source: National Science Foundation
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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; Schrodinger-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.
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