Before the 1960s, all anti-Stokes emissions, which were known to exist, involved emission energies in excess of excitation energies by only a few kT. They were linked to thermal population of energy states above excitation states by such an energy amount. It was the well-known case of anti-Stokes emission for the so-called thermal bands or in the Raman effect for the well-known anti-Stokes side...

Engineering photon emission and scattering is central to modern photonics applications ranging from light harvesting to quantum-information processing. To this end, nanophotonic waveguides are well suited as they confine photons to a one-dimensional geometry and thereby increase the light-matter interaction. In a regular waveguide, a quantum emitter interacts equally with photons in either of t...

In comparison to the coherent ultra-tight GPS/INS integration, the non-coherent ultra-tight integration is more preferable for tracking weak signals because the code discriminator used in the non-coherent integration is independent of the carrier phase, which makes it to be computed regardless of whether the SNR being strong enough or not to track the carrier phase. This paper proposes a specif...

We consider a relaxation of a single mode of the quantized field in a presence of oneand two-photon absorption and emission processes. Exact stationary solutions of the master equation for the diagonal elements of the density matrix in the Fock basis are found in the case of completely saturated two-photon emission. If two-photon processes dominate over single-photon ones, the stationary state ...

We study spontaneous directionality in the bosonic amplification of atom pairs emitted from an elongated Bose-Einstein condensate, an effect analogous to superradiant emission of atom-photon pairs. Using a simplified model, we make analytic predictions regarding directional effects for both atom-atom and atom-photon emission. These are confirmed by numerical mean-field simulations, demonstratin...

We present a ≈ 20 ks Chandra ACIS-S observation of the strongly lensed z = 2.285 ultra-luminous infrared galaxy FSC 10214+4724. Although this observation achieves the equivalent sensitivity of an up-to ≈ 4 Ms Chandra exposure (when corrected for gravitational lensing), the rest-frame 1.6–26.3 keV emission from FSC 10214+4724 is weak (LX ≈ 2×10 erg s for a lensing boost of ≈ 100); a significant ...

Two-photon emission from semiconductors was recently observed, but not fully interpreted. We develop a dressed-state model incorporating intraband scattering-related level broadening, yielding nondivergent emission rates. The spectrum calculations for high carrier concentrations including the time dependence of the screening buildup correspond well to our measured two-photon emission spectrum f...

Neuroimaging techniques have had a dramatic impact on the evaluation and treatment of patients with epilepsy. In order to take full advantage of their potential, it is important to place them in clinical and electrophysiological context and to understand their technical limitations. Positron emission tomography with 18F-2-deoxyglucose and single photon emission computed tomography can provide v...