X iv :q ua nt -p h/ 05 10 11 3 v3 22 M ar 2 00 6 Heralded single-photon generation using imperfect single-photon sources and a two-photon-absorbing medium Thomas Konrad∗, Artur Scherer, Michael Nock, and Jürgen Audretsch Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany Abstract We propose a setup for a heralded, i.e. announced generation of a pure single-photon state given tw...

Small-angle scattering X-ray photon correlation spectroscopy (XPCS) studies were performed using a novel photon-counting pixel array detector with dual counters for each pixel. Each counter can be read out independently from the other to ensure there is no readout dead-time between the neighboring frames. A maximum frame rate of 11.8 kHz was achieved. Results on test samples show good agreement...

In studying the Mach-Zender interferometer and Young’s Double Slit experimental setups, we can observe the wave-particle duality of light using an attenuated laser beam. In the Mach-Zender setup, we demonstrate that the fringe visibility of the interference pattern changes as the analyzing polarizer angle changes which controls “which path” information. In addition, the fringe visibility increa...

PACS numbers: DOI: 10.1134/S1054660X0707@@@@

Electromagnetic radiation can be successfully modelled as a stream of particles with zero rest-mass, the so-called photons. For this reason, the holy grail of image sensing is a two-dimensional array of photodetectors, capable of sensing each individual incident photon. Despite the simplicity of this demand, it is surprising to realize how many different solutions to the single-photon imaging p...

We report the full implementation of a quantum cryptography protocol using a stream of single photon pulses generated by a stable and efficient source operating at room temperature. The single photon pulses are emitted on demand by a single nitrogen-vacancy color center in a diamond nanocrystal. The quantum bit error rate is less that 4.6% and the secure bit rate is 7700 bits/s. The overall per...

We report the cooling of an atomic ensemble with light, where each atom scatters only a single photon on average. This is a general method that does not require a cycling transition and can be applied to atoms or molecules that are magnetically trapped. We discuss the application of this new approach to the cooling of hydrogenic atoms for the purpose of precision spectroscopy and fundamental te...