Quantum properties of counterpropagating two-photon states generated in a planar waveguide

Abstract

A nonlinear planar waveguide pumped by a beam orthogonal to its surface may serve as a versatile source of photon pairs. Changing pump-pulse duration, pump-beam transverse width, and angular decomposition of pump-beam frequencies characteristics of a photon pair including spectral widths of signal and idler fields, their time durations as well as degree of entanglement of two fields can be changed significantly. Using the measured spectral widths of the down-converted fields and width of a coincidence-count dip in a Hong-Ou-Mandel interferometer entropy of entanglement can be determined.

Measurement-based tailoring of Anderson localization of partially coherent light

“…In this case, the Schmidt modes correspond to Hermite functions of order j [31,32]. Some representative cases are shown in Fig.1(d).…”

Photon-pair generation in random nonlinear layered structures

“…Or wave-guiding structures with transverse pumping and counter-propagating signal and idler fields can be exploited [23,24,25,26,27,28,29,30]. The last two approaches are quite flexible and allow the generation of states having two-photon amplitudes with an arbitrary orientation of main axes of their (approximately) gaussian shape.…”

Semiconductor Ridge Microcavities Generating Counterpropagating Entangled Photons

“…Further theoretical developments have been made towards the generation of photon pairs with arbitrary joint spectrum (Walton et al, 2004;Perina, 2008). In particular, a more refined shaping of the pump beam using achromatic phase matching (i.e.…”

“…Several phase-matching schemes have been demonstrated in these systems (Ducci et al, 2005): form birefringence, modal phase matching, counterpropagating phase matching. In particular, the last one has attracted a deal of attention because of its unusual flexibility in the control of the quantum properties of the emitted photons (Walton et al, 2003;Walton et al, 2004;Perina, 2008). Here we present a semiconductor ridge microcavity emitting counterpropagating entangled photons; in Section 2 we explain the working principle of this device giving the details of the phase matching scheme and the effects of the microcavity.…”