In-phase and anti-phase entanglement dynamics of Rydberg atomic pairs.

We study the correlated evolutions of two far-spaced Rydberg atomic pairs with different resonant frequencies, interacting via van der Waals (vdW) potentials and driven by a common laser field. They are found to exhibit in-phase (anti-phase) beating dynamics characterized by identical (complementary) intra-pair entanglements under a specific condition in regard of inter-pair vdW potentials and driving field detunings. This occurs when each atomic pair just oscillates between its ground state and symmetric entangled state because its doubly excited state and asymmetric entangled state are forbidden due to rigid dipole blockade and perfect destructive interference, respectively.

Enhanced nonlinear characteristics with the assistance of a [Formula: see text]-symmetric trimer system.

We study the parity-time (PT) symmetry characteristics and the applications to nonlinear optics in an optical trimer system consisting of two indirectly coupled standing-mode micro-cavities and a two-level quantum emitter (QE) placed at the intersection of two cavities. We find this trimer system can exhibit analogical phenomena as those in typical [Formula: see text]-symmetric dimer systems composed of a passive cavity directly coupled to an active cavity. This system, whose [Formula: see text] symmetry is demonstrated by our analytic results, can be transformed between the [Formula: see text]-symmetric phase and the [Formula: see text]-broken phase by adjusting relevant system parameters.

Synchronization enhancement of indirectly coupled oscillators via periodic modulation in an optomechanical system.

We study the synchronization behaviors of two indirectly coupled mechanical oscillators of different frequencies in a doublecavity optomechanical system. It is found that quantum synchronization is roughly vanishing though classical synchronization seems rather good when each cavity mode is driven by an external field in the absence of temporal modulations. By periodically modulating cavity detunings or driving amplitudes, however, it is possible to observe greatly enhanced quantum synchronization accompanied with nearly perfect classical synchronization.

Asymmetric light diffraction of an atomic grating with PT symmetry.

Cold atoms trapped in one-dimensional optical lattices and driven to the four-level N configuration are exploited for achieving an electromagnetically induced grating with parity-time-symmetry. This nontrivial grating exhibits unidirectional diffraction patterns, e.g.

The relationship between surgical site infection and volume of coronary artery bypass graft surgeries: Taiwan experience.

In this study, the overall incidence of surgical site infection was 8.83% (3.28% for index hospitalization events [ie, events that occurred during hospitalization for surgery] and 5.

Association of case volume with mortality of chinese patients after coronary artery bypass grafting: Taiwan experience.

Background: An inverse relationship between surgeon volume or hospital volume and mortality has been reported in Western countries, but seldom in Asia.

Methods And Results: The data of 4,724 patients with coronary artery disease who underwent coronary artery bypass graft (CABG) surgery in Taiwan between 1(st) January 2000 and 31(st) December 2001 were analyzed in this prospective cohort study. Overall, 3.