abstract background: accumulation of secretions in the airways of patients with an endotracheal tube and mechanical ventilation will have serious consequences. one of the most common methods of airway clearance is endotracheal suctioning. in order to facilitate discharge of airway secretion resulting in promotion of gas exchange, chest physiotherapy techniques can be used at the time of expirat...

We study entanglement and squeezing of a cluster of spin systems under the influence of the two-axis countertwisting Hamiltonian. The squeezing parameters given by Wineland et al and also by Kitagawa et al. are chosen as the criteria of spin squeezing. The criterion of pairwise entanglement is chosen to be the concurrence and that of the bipartite entanglement the linear entropy. We also define...

we study entanglement and squeezing of a cluster of spin systems under the influence of the two-axis countertwisting hamiltonian. the squeezing parameters given by wineland et al and also by kitagawa et al. are chosen as the criteria of spin squeezing. the criterion of pairwise entanglement is chosen to be the concurrence and that of the bipartite entanglement the linear entropy. we also define...

1. Squeezing and Elongational Flow in Fluid Foods 2. Foundations of Squeezing Flow Viscometry 2.1. Elongational Flow: Lubricated Squeezing Flow Kinematics 2.2. Shear Flow: Non-lubricated Squeezing Flow Kinematics 3. Parallel Plates Viscometer 3.1. Lubricated Squeezing Flow 3.2. Non-lubricated Squeezing Flow 3.3. Applications 3.4. Shortcomings 3.5. Other Configurations 4. Concluding Remarks and ...

We introduce a model of squeezing and noise reduction in the Kerr effect that accounts for noise in all quadratures of the driving field. Consequently we show that Kerr squeezing is much more sensitive to driving noise than squeezing produced by second harmonic generation (SHG). We experimentally demonstrate this sensitivity using a nonlinear system that tunes between strong classical SHG and K...

We present a brief history of experimental studies of quadrature squeezing, a tutorial on the physical origin and theory of squeezing, and our experimental study of squeezing by means of x (2) (second-order) nonlinear waveguides. We recently obtained 28% squeezing in quasi-phase-matched LiTaO3 waveguides, using picosecond pulses. The amount of squeezing appears to be limited primarily by blue-l...

The characteristics of squeezed light generated by both passive (occurring in a cavity external to a laser) and active (occurring within a laser cavity) second-harmonic generation (SHG) are investigated and contrasted. Squeezing of both the fundamental and the second harmonic is discussed, and the issue of doubly versus singly resonant behavior is addressed. We examine passive squeezing by expl...

We report the generation of a macroscopic singlet state in a cold atomic sample via quantum nondemolition measurement-induced spin squeezing. We observe 3 dB of spin squeezing and detect entanglement with 5σ statistical significance using a generalized spin-squeezing inequality. The degree of squeezing implies at least 50% of the atoms have formed singlets.

∗ Author to whom correspondence should be addressed: [email protected] † Author to whom correspondence should be addressed: [email protected] In the trapped-ion experiment, the squeezing operations are limited to the range of ζX(ζY) ≤ 4 in Eq. (6). Since ÛDok involves the squeezing and inverse squeezing operations, we can freely rescale the squeezing parameters with a single arbi...