Quantum temperature of a modulated oscillator: spectral signatures

Vittorio Peano, Lingzhen Guo, Michael Marthaler +1 more

Mirco Kolarczik, Nina Owschimikow, Yücel Kaptan +5 more

Rabi oscillations imprint an intensity modulation on the electric field of the laser pulse creating them. We experimentally observe this signature in a quantum dot ensemble at room temperature for arbitrary degrees of inversion.

Simone De Liberato, Cristiano Ciuti, Iacopo Carusotto

We develop a general theory of the quantum vacuum radiation generated by an arbitrary time modulation of the vacuum Rabi frequency of an intersubband transition in a doped quantum well system embedded in a planar microcavity. Both nonradiative and radiative losses are included within an input-output quantum Langevin framework. The intensity and the spectral signatures of the extra-cavity emission are characterized versus the modulation properties. For realistic parameters, the photon pair emission is predicted to largely exceed the blackbody radiation in the mid and far infrared. For strong and resonant modulation a parametric oscillation regime is achievable.

A.N Lebedev

G. W. Ford

Gautam Rai, Henning Schlömer, Chris Matsumura +2 more

We investigate how a perpendicular space analysis of quasiperiodic systems may be used to gain insight into their topological properties. In particular, for the Fibonacci chain, we show that the number of times quantities such as the charge density and the entanglement entropy oscillate in perpendicular space is directly related to the integer topological labels of its spectral gaps. We show that these oscillations have two distinct interpretations, obtained by extrapolating results from the two extreme limits of the Fibonacci chain -- the valence bond picture in the strong modulation limit, and perturbation around the periodic chain in the weak modulation limit. This effect is found to remain robust at moderate interactions, as well as in the presence of disorder. It thus suggests a straightforward way to experimentally measure topological invariants of such systems without invoking phason flips.