Suppression of Parasitic Nonlinear Processes in Spontaneous Four-Wave Mixing with Linearly Uncoupled Resonators

We report on a signal-to-noise ratio characterizing the generation of identical photon pairs of more than 4 orders of magnitude in a ring resonator system. Parasitic noise, associated with single-pump spontaneous four-wave mixing, is essentially eliminated by employing a novel system design involving two resonators that are linearly uncoupled but nonlinearly coupled. This opens the way to a new class of integrated devices exploiting the unique properties of identical photon pairs in the same optical mode

Dinamiche insediative nella Liguria di ponente in et\ue0 post-classica: la mansio e il complesso paleocristiano di Capo Don a Riva Ligure

Il contributo presenta aggiornamenti sulle indagini presso la basilica paleocristiana di Capo Don a Riva Ligure (IM

Electrically driven source of time-energy entangled photons based on a self-pumped silicon microring resonator

Time-energy entangled photon pairs are fundamental resources for quantum communication protocols since they are robust against environmental fluctuations in optical fiber networks. Pair sources based on spontaneous four-wave mixing in silicon microring resonators usually employ expensive external tunable lasers to compensate for ambient fluctuations; adopting self-pumped configurations, instead, lifts the need for such external source. Here we demonstrate the emission of time-energy entangled photon pairs at telecom wavelengths from a silicon self-pumped ring, obtaining a Franson interference fringe with 93.9% ± 0.9% visibility

Experimental test of the collapse time of a delocalized photon state

We investigate whether the collapse of the quantum state of a single photon split between two space- like separated places takes a nonvanishing time. We realize this by using a source of heralded single photons, then splitting the resulting single photon state and letting it propagate over distances much larger than the experimental time resolution times the speed of light c. We find no additional delay within our accuracy and set a lower limit for the speed of collapse of the quantum state to 1550c

C2-symmetrical sterol–polyether conjugates as highly efficient synthetic ionophores

A new class of artificial ionophores has been rationally designed and synthesized linking to a tetrafunctionalized L-treitol spacer two rigid hydrophobic 3beta-hydroxy-5alpha-23,24-bisnorcholanic units and two flexible hydrophilic oligo(ethylene glycol) chains. Compounds 1a and 1b were incorporated into phospholipid vesicles and shown to facilitate Na+-transport

Emission of time-energy entangled photon pairs by a self-pumped silicon microresonator

We demonstrate emission of photon pairs from a Silicon integrated microresonator under electrical self-pumping. By controlling excitation conditions, the photon pairs are time-energy entangled, with fringe visibility in a Franson experiment of 93.9% ± 0.9%

An artificial ionophore based on a polyhydroxylated steroid dimer

The Na+ transporting properties of the first member of a new class of artificial ionophores, based on a C-2-symmetric polyhydroxylated steroid dimer, are described