Semiconductor Ridge Microcavities Generating Counterpropagating Entangled Photons
Xavier Caillet, Adeline Orieux, Iván Favero, Giuseppe Leo, S. Ducci · InTech eBooks · 2010
These results open the way to the demonstration of several interesting features associated to the counterpropagating geometry, as the direct generation of polarization entangled Bell state or the control of the generated two-photon state via an appropriate choice of the spatial and spectral pump beam profile. Indeed recent developments in quantum information theory have arisen a growing interest on `generalized' states of frequency correlation (like frequency-correlated or frequency-uncorrelated photons). For example: i) quantum teleportation and entanglement swapping require the synchronized creation of multiple photon pairs, which is achieved by using a short pump pulse (thus relaxing the strict frequency anti-correlation of the generated photons mentioned above); ii) linear optical quantum computation requires uncorrelated photons in order to guarantee their