Randomly poled nonlinear crystals as a source of photon pairs

Abstract

Generation of photon pairs from randomly poled nonlinear crystals is investigated using analytically soluble model and numerical calculations. Randomly poled crystals are discovered as sources of entangled ultra broad-band signal and idler fields. Their photon-pair generation rates scale linearly with the number of domains. Entanglement times as short as several fs can be reached. Comparison with chirped periodically-poled structures is given and reveals close similarity.

Spin-dependent thermoelectric properties of a Kondo-correlated quantum dot with Rashba spin–orbit coupling

“…3 For example, the Fano antiresonance may be identified in photoelectron ionization spectra of an autoionization system with one discrete level interacting with a neighbor two-level atom. 11 The Fano effect is well known not only in optics, but also in mesoscopic physics. It has been observed in systems consisting of a quantum dot attached to external leads.…”

Resonant single-photon double ionization driven by combined intra- and interatomic electron correlations

“…It has been observed in a variety of sys-tems, comprising noble gas dimers [12] and clusters [13]. The closely related process of two-center photoionization (2CPI) was also studied, both theoretically [14,15] and experimentally in He-Ne dimers [16] and Ne-Ar clusters [17]. A similar energy transfer process was identified in the photoionization of helium droplets doped with rare gas atoms [18].…”

Two-center electron-impact ionization via collisional excitation-autoionization

“…Associated experiments have been carried out comprising noble gas dimers [8], clusters [9] and water molecules [10]. Both theoretical [11,12] and experimental [13] studies have been performed on the closely related process of two-center photoionization as well.…”