We report the measurement of entangled two-photon absorption (ETPA) cross section, σE, at 808 nm on organic chromophores in solution a low photon flux regime. performed measurements zinc tetraphenylporphyrin (ZnTPP) toluene and rhodamine B (RhB) methanol. This is, to best our knowledge, first time that σE is measured for RhB. Additionally, we study dependence molecular concentration both systems. In contrast previous experiments, are based detecting pairs photons transmitted by system. By...

In this contribution, the entangled two-photon absorption (ETPA) process on naturally occurring flavoproteins was studied. Low temperature responsive protein (LOT6P) and b-type dihydroorotate dehydrogenase (DHOD B), which possess flavin mononucleotide (FMN) adenine dinucleotide (FAD) chromophores embedded in environment, were investigated. The ETPA cross-section measured, we found that it increases when going from an aqueous solution of free chromophore to protein. This enhancement is...

Entangled photons exhibit strong nonclassical frequency and time correlations simultaneously, which allow them to excite extract information about molecules in new ways compared classical spectroscopy. In this report, we demonstrate the accessibility of entangled two-photon absorption (ETPA) as an analytical technique using CW-pumped type-I degenerate spontaneous parametric down-conversion. We made improvements lower noise, error, limit detection ETPA experiment. prove quantify entanglement...

The use of a nonclassical light source for studying molecular electronic structure has been great interest in many applications. Here we report theoretical study entangled two-photon absorption (ETPA) organic chromophores, and provide new insight into the quantitative relation between ETPA corresponding unentangled TPA based on significantly different line widths associated with processes. A sum-over-states approach is used to obtain classical cross sections explore contribution each state...

ConspectusThe enhanced interest in quantum-related phenomena has provided new opportunities for chemists to push the limits of detection and analysis chemical processes. As some have called this second quantum revolution, a time come apply rules learned from previous research toward methods technologies important chemists. While there been great recently information science (QIS), quest understand how nonclassical states light interact with matter ongoing more than two decades. Our entry...

The dynamics following electronic excitation of hypoxanthine and its nucleoside inosine were studied by femtosecond fluorescence up-conversion. Our objective was to explore variants the purinic DNA bases in order determine molecular parameters that increase or reduce accessibility ground state conical intersections. From experiments water methanol solution we conclude both dominant neutral tautomers exhibit ultrashort excited lifetimes (τ < 0.2 ps), which are significantly shorter than...

The electronic relaxation dynamics of the second singlet excited states several cyanine dyes was studied through femtosecond fluorescence up-conversion technique. Our interest in these molecules comes from potential applications systems with upper a long lifetime, which can include electron and energy transfer higher lying singlets after one- or two-photon absorption. We three series cyanines 4-quinolyl, 2-quinolyl, benzothiazolyl type end groups, each varying sp(2) carbon conjugation...

Photon-to-spin quantum transduction, i.e., the exchange of coherence between photons and spins, is important for establishing links localized molecular qubit systems performing logic and/or sensing operations similar at different physical locations. We are developing to explore how transduction can be implemented by using entangled produce spin pairs ultrafast electron transfer leading spin-correlated radical (SCRPs). have prepared systematically evaluated dyads triads based on a...

Despite decades of research, the mechanism anesthetic-induced unconsciousness remains incompletely understood, with some advocating for a quantum mechanical basis. associations between general anesthesia and changes in physical properties such as electron spin, there has been no empirical demonstration that anesthetics are capable functional interactions. In this work, we studied linear non-linear optical halogenated ethers sevoflurane (SEVO) isoflurane (ISO), using UV-Vis spectroscopy, time...

Perovskite quantum dots (PQDs) with different compositions have shown promise for applications in light-emitting devices, photovoltaic and optical technologies due to their superior photo-physical properties compared that of traditional nanoparticles. Here, we report composition-dependent exciton coherence time halide PQDs using time-resolved two-photon near-field scanning microscopy (NSOM) at room temperature. When hybrid organic–inorganic PQDs, all-inorganic longer electronic coherent...

In this work, we present a theoretical and experimental study about the spatial correlations of paired photons generated by type-II spontaneous parametric down-conversion. particular, show how these can be positive or negative depending on direction in which far field plane is scanned polarization post-selected. Our results provide straightforward way to observe different kind correlations, that complement other well known methods tune photons.

The decay of electronically excited allopurinol riboside was studied through the fluorescence up-conversion technique and high level ab initio calculations. For system with a pyrazolic five-membered ring, we observed an ultrafast signal in water (τ < 0.2 ps), similar to what has been for hypoxanthine inosine (with imidazolic ring). These results show that S(1) dynamics this type heterocyclic systems are general dominated by distortion pyrimidinic six-membered ring negligible influence rest...

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