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Controlling superpositions of electronic quantum states through nonlinear interactions is central to quantum computing. At THz frequencies, solid-state systems exhibit numerous elementary excitations suitable to this purpose, yet efficient dephasing mechanisms render their exploitation challenging. The cyclotron resonance, protected from Coulomb interactions by Kohn's theorem, is a unique exception...
We discuss recent experimental and theoretical results that report on the observation of dipole-forbidden intra-exciton transitions in semiconductors via terahertz excitation. Additional manipulation capabilities are gained through the application of a magnetic field.
The paper presents a theoretical analysis of the nonlinear THz response from the internal transitions of coherent and incoherent excitons based on the formulated microscopic THz theory. Moreover, the response of unexcited semiconductors to extremely intense THz fields is investigated .The intersubband transitions of optically excited quantum wells using linear THz spectroscopy is also studied. The...
The appearance of the two-photon strong-coupling states is analyzed in atomic vs. semi-conductor quantum-dot microcavities. An identical excitation mechanism explains phenomena observed in photon-correlation measurements.
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