Cram\'er-type Moderate Deviation of Normal Approximation for Exchangeable Pairs

In Stein's method, an exchangeable pair approach is commonly used to estimate the convergence rate of normal and nonnormal approximation. Using the exchangeable pair approach, we establish a Cram\'er-type moderate deviation theorem of normal approximation for an arbitrary random variable without a bound on the difference of the exchangeable pair. A Berry--Esseen-type inequality is also obtained. The result is applied to the subgraph counts in the Erd\"os--R\'enyi random graph, local dependence, and graph dependency.Comment: 38 page

Entanglement concentration for unknown atomic entangled states via entanglement swapping

An entanglement concentration scheme for unknown atomic entanglement states is proposed via entanglement swapping in cavity QED. Because the interaction used here is a large-detuned one between two driven atoms and a quantized cavity mode, the effects of the cavity decay and thermal field have been eliminated. These advantages can warrant the experimental feasibility of the current scheme.Comment: 4 page

Bounded Gaps Between Products of Distinct Primes

Let $r \ge 2$ be an integer. We adapt the Maynard-Tao sieve to produce the asymptotically best-known bounded gaps between products of $r$ distinct primes. Our result applies to positive-density subsets of the primes that satisfy certain equidistribution conditions. This improves on the work of Thorne and Sono