Last time we established the quantum version of coupled-mode theory for spontaneous parametric downconversion (SPDC). We exhibited the exact solutions for the output signal and idler beams, their jointly Gaussian state characterization when the input beams are in their vacuum states, and the low-gain regime approximations for the correlation functions that characterize that state. We also intro...

We investigate the effect of a degenerate optical parametric amplifier (OPA) placed inside an optomechanical cavity on the steady-state entanglement of two cavity modes, which jointly interact with a mechanical resonator. Two cavity modes are respectively driven at the red and blue sideband associated with the mechanical resonator, which generates entanglement between them in the limit of resol...

Phase regeneration of phase-shift keying signals is theoretically proposed, we believe for the first time, based on the efficient optical parametric amplification (OPA) process in a highly nonlinear symmetric hybrid plasmonic waveguide. This optimized stacked waveguide with nonlinear organic materials has a relatively low loss of about 0.005 dB/μm and an effective nonlinear OPA coupling coeffic...

Reprints available directly from the publisher Photocopying permitted by license only (C) 1999 OPA (Overseas Publishers Association) N.V. In our preceding note, we discussed a generalized Schwarz inequality, an improvement of the Heinz-Kato-Furuta inequality and an inequality related to the Furuta inequality. In succession, we give further discussions on them from the viewpoint of the covarianc...

Many critical infrastructures such as the power transmission grid are heterogeneous both in their basic structure and in some of their underlying characteristics, This heterogeneity can be good for system robustness if it reduces the spread of failures or bad if it adds risk or vulnerability to the system. In this paper we investigate the effect of heterogeneity in the strength of the links bet...

Strong chemical gradients between clay and concrete porewater lead to diffusive transport across the interface subsequent mineral reactions in both materials. These may influence properties such as swelling behaviour, permeability or radionuclide retention, which are relevant for safety of a radioactive waste repository. Different cement types different interactions with Opalinus Clay (OPA), mu...

This study was accomplished to detect variation generated through eposure of fenugreek (trigonella foenum-graecum L.) seeds seven gamma irradiation doses (0,25,50,100,150,300 and 400) GY by using twenty RAPDs primers as molecular marker ,results indicated that OPA-14 ,OPC-19 OPH-01success in giving five treatments a unique fingerprint. Molecular size amplicon ranged between 2913 bp produced pri...

The interaction with human phagocytes is a hallmark of symptomatic Neisseria gonorrhoeae infections. Gonococcal outer membrane proteins of the Opa family induce the opsonin-independent uptake of the bacteria that relies on CEACAM receptors and an active signaling machinery of the phagocyte. Here, we show that CEACAM receptor-mediated phagocytosis of Opa(52)-expressing N. gonorrhoeae into human ...

We present a new approach to investigate how the photodynamics of an octahedral ruthenium(II) complex activated through two-photon absorption (TPA) differ from the equivalent complex activated through one-photon absorption (OPA). We photoactivated a Ru(II) polypyridyl complex containing bioactive monodentate ligands in the photodynamic therapy window (620-1000 nm) by using TPA and used transien...

Tunnelling in bedded shale rocks induces damage around the excavation. Consequently, rock mass excavation damaged zone (EDZ) shows different thermo-hydro-mechanical (THM) properties from intact rock. In turn, material close to tunnel wall is affected by seasonal fluctuations temperature and relative humidity (RH) variations associated with ventilation, impacting total suction saturation state o...