Quantum spectroscopy with Schrodinger-cat states
Quantum spectroscopy with Schrodinger-cat states
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DOI：
10.1038/nphys2091
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发表时间：
2011-10-01
期刊：
影响因子：
19.6
通讯作者：
Cundiff, S. T.
中科院分区：
文献类型：
--
作者：
Kira, M.;Koch, S. W.;Cundiff, S. T.
利用光物质纠缠的激光光谱技术有望获得多体构型。然而，它们的实际实施受到所涉及的大量耦合状态的阻碍。在这里，我们介绍了一个计划，以处理这种复杂性相结合的定量实验与理论分析。我们分析了半导体量子威尔斯的吸收特性，并提出了一个收敛的集群膨胀变换，强大的项目上的真实的量子响应的大量的定量经典测量。经典和量子源产生显着不同的结果，薛定谔猫态可以增强信号的数量级。此外，源的压缩可以帮助单独控制和表征激子，双激子和电子空穴复合物。
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.