314 research outputs found
Single-photon-triggered quantum chaos
We demonstrate how to manipulate quantum chaos with a single photon in a
hybrid quantum device combining cavity QED and optomechanics. Specifically, we
show that this system changes between integrable and chaotic relying on the
photon-state of the injected field. This onset of chaos originates from the
photon-dependent chaotic threshold of the qubit-field coupling induced by the
optomechanical interaction. By deriving the Loschmidt Echo we observe clear
differences in the sensitivity to perturbations in the regular versus chaotic
regimes. We also present classical analog of this chaotic behavior, and find
good correspondence between chaotic quantum dynamics and classical physics. Our
work opens up a new route to achieve quantum manipulations, which are crucial
elements in engineering new types of on-chip quantum devices and quantum
information science.Comment: 11 pages, 4 figure
(E)-2-[(2-Amino-4,5-dibromophenyl)iminomethyl]-6-methoxyphenol
The title compound, C14H12Br2N2O2, was prepared from the condensation of 4,5-dibromo-1,2-phenylenediamine and 2-hydroxy-3-methoxybenzaldehyde in methanol. The N=C double bond shows a trans conformation and the dihedral angle between the aromatic ring planes is 5.9 (4)°. In the crystal structure, there are intramolecular O—H⋯N and N—H⋯N and intermolecular N—H⋯O hydrogen bonds, the latter resulting in inversion dimers
Di-μ-chlorido-bis[chlorido(N,N-dimethylethylenediamine-κ2 N,N′)zinc(II)]
The centrosymmetric dinuclear title compound, [Zn2Cl4(C4H12N2)2], is isostructural with its previously reported CuII analogue [Phelps, Goodman & Hodgson (1976 ▶). Inorg. Chem.
15, 2266–2270]. In the title compound, each of the ZnII ions is coordinated by two N atoms from a chelating N,N-dimethylethylenediamine ligand, two bridging Cl atoms and one terminal Cl atom. The coordination environment is distorted square-pyramidal. The Zn—Cl bond distances of the two bridging Cl atoms are distinctly different: the equatorial Cl atom exbibits a Zn—Cl distance of 2.318 (1) Å and the axial Cl atom exbibits a Zn—Cl distance of 2.747 (2) Å, which is significantly longer. The molecule can thus be seen as a dimer of two nearly square-planar monomeric units which are related to each other by an inversion center located in the middle of the dimer. Within one monomeric unit, the Zn atom, the two N atoms and the two Cl atoms are almost coplanar, with a mean deviation of only 0.05 (1) Å from the associated least-squares plane. The Zn⋯Zn distance within the dimer is 3.472 (3) Å. N—H⋯Cl and C—H⋯Cl hydrogen-bond interactions connect neighboring molecules with each other
{6,6′-Dimethoxy-2,2′-[4-bromo-o-phenylenebis(nitrilomethylidyne)]diphenolato}nickel(II) methanol solvate
In the title compound, [Ni(C22H17BrN2O4)]·CH3OH, the NiII ion is in a slightly distorted square-planar geometry involving an N2O2 atom set of the tetradentate Schiff base ligand. The asymmetric unit contains one nickel complex and one methanol solvent molecule. The dihedral angle between the aromatic ring planes of the central aromatic ring and other two aromatic rings are 10.8 (3) and 6.0 (2)°. The crystal structure is stabilized by intermolecular C—H⋯O and C—H⋯Br and by intramolecular O—H⋯O hydrogen bonds
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