RRA stands for the class of representable relation algebras, while RCAn stands for the class of cylindric algebras of dimension n. We give a simple new proof to the following. 1. There exist two atomic relation algebras with the same atom structure, only one of which is representable. 2. RRA is not closed under completions and is not atom-canonical. 3. There exists a non-representable relation ...

A proposal for the implementation of quantum walks using cold atom technology is presented. It consists of one atom trapped in time varying optical superlattices. The required elements are presented in detail including the preparation procedure, the manipulation required for the quantum walk evolution and the final measurement. These procedures can be, in principle, implemented with present tec...

We answer an open question in the theory of degrees of infinite sequences with respect to transducibility by finite-state transducers. An initial study of this partial order of degrees was carried out in [5], but many basic questions remain unanswered. One of the central questions concerns the existence of atom degrees, other than the degree of the ‘identity sequence’ 10101010 · · · . A degree ...

• Cl atoms may be generated by reactions of sea salt particles transported inland with air masses. • A potential approach to investigate the importance of chlorine atom chemistry in the coastal areas is to identify the products and mechanisms of its reactions with organics, e.g. 1,3-butadiene.

Atom Position Coding in a Matching Pursuit Based Video Coder

In this paper we present a short overview of atom interferometry based on light pulses. We discuss different implementations and their applications for high precision measurements. We will focus on the determination of the ratio h/m of the Planck constant to an atomic mass. The measurement of this quantity is performed by combining Bloch oscillations of atoms in a moving optical lattice with a ...

Atom interferometers were ® rst realized ten years ago, and since then have evolved from beautiful demonstrations of quantum physics into instruments at the leading edge of precision measurement. In this article we trace the development of atom interferometry, looking at how the physical principles have been put into practice to achieve ground-breaking experiments. We also discuss new atom opti...

Two-pulse atomic coherent control (2PACC) spectroscopy is presented. The idea is demonstrated by simulating a source consisting of a two-pulse atom laser impinging on a surface covered with a co-adsorbed atom. The controlled outcome is an Eley–Rideal chemical reaction where the controls are the time delay and relative phase between the twopulses. The two atom laser pulses interfere with each ot...

We propose a new way for sympathetic cooling of ions in an electromagnetic Paul trap: it implies the use this purpose cold buffer atoms region atom-ion confinement-induced resonance (CIR). The problem is that unavoidable micromotion ion and long-range nature its interaction with environment colder hybrid atomic-ion trap prevent cooling. show destructive effect on can however be suppressed vicin...