Dilepton excess from local parity breaking in baryon matter

We propose that local parity breaking induced by a large-scale fluctuation of topological charge at large temperatures and/or condensation of pseudoscalar mesons in the isotriplet channel for large baryon densities may be responsible for the substantial dilepton excess that is found for low invariant masses and moderate values of _pT$p_T$ in central heavy ions collisions. This insofar unexplained enhancement could be understood by a combination of two effects leading to an excess of both e⁺e⁻$e^{+}{e}^{-}$ and μ⁺μ⁻${\mu }^{+}{\mu }^{-}$ pairs with respect to theoretical predictions based on conventional hadronic processes: (a) a modification of the dispersion relation of photons and vector mesons propagating in such a nuclear medium due to local parity breaking; (b) the appearance of new decay channels, forbidden by parity conservation in QCD in the usual vacuum. Possible signatures of this effect and perspectives for its detection are discussed.     

Quantum computers on multiatomic ensembles in quantum electrodynamic cavity

Schemes for the construction of quantum computers on multiatomic ensembles in quantum electrodynamic cavity are considered. With that, both encoding of physical qubits on each separate multiatomic ensemble and logical encoding of qubits on the pairs of ensembles are introduced. Possible constructions of swapping (SWAP, \(\sqrt {SWAP} \)) and controlled swapping gates (CSWAP) are analyzed. Mechanism of collective blockade and dynamical elimination procedure are proposed for realization of these gates. The comparison of the scheme solutions is carried out for the construction of quantum computer at using of physical and logical qubits.     

Calculation and Comparative Analysis of IR Spectra of a Number of Brassinolides with Different Side-Chain Structures

Journal of Applied Spectroscopy - Experimental IR spectra and theoretical spectral absorption curves of the practically important biologically active steroid phytohormones...