ar X iv : 0 90 3 . 10 90 v 1 [ qu an t - ph ] 5 M ar 2 00 9 Interference contrast in multi - source few photon optics

ar X iv : 0 90 3 . 10 90 v 2 [ qu an t - ph ] 2 2 M ay 2 00 9 Interference contrast in multi - source few photon optics

Many recent experiments employ several parametric down conversion (PDC) sources to get multiphoton interference. Such interference has applications in quantum information. We study here how effects due to photon statistics, misalignment, and partial distinguishability of the PDC pairs originating from different sources may lower the interference contrast in the multiphoton experiments. PACS num...

ar X iv : 0 90 9 . 06 46 v 2 [ qu an t - ph ] 2 5 N ov 2 00 9 Time gating of heralded single photons for atomic memories

We demonstrate a method for time gating the standard heralded continuouswave (cw) spontaneous parametric down-converted (SPDC) single photon source by using pulsed pumping of the optical parametric oscillator (OPO) below threshold. The narrow bandwidth, high purity, high spectral brightness and the pseudo-deterministic character make the source highly suitable for light-atom interfaces with ato...

ar X iv : 0 90 3 . 05 62 v 1 [ as tr o - ph . G A ] 3 M ar 2 00 9 Introduction to Millimeter / Sub - Millimeter

ar X iv : 0 90 3 . 31 18 v 1 [ qu an t - ph ] 1 8 M ar 2 00 9 Generation of a Common Reference String , secure against Quantum Adversaries , and Applications

In this paper, we present the generation of a common reference string “from scratch” via coin-flipping in the presence of a quantum adversary. First, we present how we achieve quantumsecure coin-flipping using Watrous’ quantum rewinding technique [Wat06]. Then, by combining this coin-flipping with any non-interactive zero-knowledge protocol we get an easy transformation from non-interactive zer...

ar X iv : 0 90 3 . 05 40 v 1 [ he p - ph ] 3 M ar 2 00 9 Methods for the Reduction of Three - Loop QCD Form Factors

Dissertation zur Erlangung der naturwissenschaftlichen Doktorwürde