ar X iv : q ua nt - p h / 01 10 17 0 v 2 9 N ov 2 00 2 Photon number conservation and photon interference

ar X iv : q ua nt - p h / 01 10 17 0 v 1 3 0 O ct 2 00 1 Photon number conservation and photon interference

The group theoretical aspect of the description of passive lossless optical four-ports (beam splitters) is revisited. It is shown through an example, that this approach can be useful in understanding interferometric schemes where a low number of photons interfere. The formalism is extended to passive lossless optical six-ports, their SU(3)-theory is outlined.

ar X iv : q ua nt - p h / 01 11 11 0 v 1 2 1 N ov 2 00 1 Generating and probing a two - photon Fock state with a single atom in a cavity

A two-photon Fock state is prepared in a cavity sustaining a " source mode " and a " target mode " , with a single circular Rydberg atom. In a third-order Raman process, the atom emits a photon in the target while scattering one photon from the source into the target. The final two-photon state is probed by measuring by Ramsey interferometry the cavity light shifts induced by the target field o...

ar X iv : q ua nt - p h / 04 11 17 2 v 1 2 3 N ov 2 00 4 Information and Entropy in Quantum Theory

ar X iv : q ua nt - p h / 04 11 02 9 v 1 4 N ov 2 00 4 A high - yield single photon source using gated spontaneous parametric down conversion

The construction of a single photon source using gated parametric fluorescence is reported with the measurement results of the photon number distribution. A beamlike twin-photon method is used in order to achieve high collection efficiency. The estimated probability P (1) to find a single photon in a collimated output pulse is 26.5 % at a repetition rate of 10 kHz when the effective quantum eff...

ar X iv : q ua nt - p h / 06 11 07 4 v 1 7 N ov 2 00 6 Analysis of critical parameters in the scheme of Björk , Jonsson , and Sánchez - Soto

Björk, Jonsson, and Sánchez-Soto describe an interesting (gedanken-)experiment which demonstrates that single photons can indeed lead to effects which have no local realistic description. We study the critical values of parameters of some possible features of a non-perfect realisation of the experiment (especially photon loss, which could be looked at as the detection efficiency), that need to ...