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

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

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 / 01 10 10 4 v 1 1 7 O ct 2 00 1 Superoscillations and tunneling times

It is proposed that superoscillations play an important role in the interferences which give rise to superluminal effects. To exemplify that, we consider a toy model which allows for a wave packet to travel, in zero time and negligible distortion a distance arbitrarily larger than the width of the wave packet. The peak is shown to result from a superoscillatory superposition at the tail. Simila...

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 / 03 10 05 9 v 2 1 0 O ct 2 00 3 Dispersion Relations and Relativistic Causality

In this paper we show that if the refractive index, or rather, [n(ω) − 1] satisfies the dispersion relations then, it is implied by Titchmarsh's theorem that, n(ω) → 1 as ω → ∞. Any other limiting value for n(ω) would violate relativistic causality, by which we mean not only that cause must precede effect but also that signals cannot travel faster–than–c, the velocity of light in a vacuum.