Sensitivity limits of a Raman atom interferometer as a gravity gradiometer

We evaluate the sensitivity of a dual cloud atom interferometer to the measurement of vertical gravity gradient. We study the influence of most relevant experimental parameters on noise and long-term drifts. Results are also applied to the case of doubly differential measurements of the gravitational signal from local source masses. We achieve a short term sensitivity of 3*10^(-9) g/Hz^(-1/2) to differential gravity acceleration, limited by the quantum projection noise of the instrument. Active control of the most critical parameters allows to reach a resolution of 5*10^(-11) g after 8000 s on the measurement of differential gravity acceleration. The long term stability is compatible with a measurement of the gravitational constant G at the level of 10^(-4) after an integration time of about 100 hours.Comment: 19 pages, 20 figure

最も荘厳な僧院とその他の名所 : エンゲルベルト・ケンペルの日本画

The German scholar Engelbert Kaempfer (1651-1716) came to Japan during the Genroku period as physician to the trading settlement of the Dutch East India Company at Nagasaki. During the two years of his visit he not only took a great amount of scholarly notes and produced a number of sketches but also succeeded in purchasing various small objects, books and maps, as well as a set of fifty finely painted watercolours of famous sights (meisho e). This article attempts to place these description and drawings of Chion-in and the large Buddha of Kyoto as an example, it is argued that these paintings, in line with other contemporary depictions, were when he wrote his famous work on Japan, and when on occasion he forgot that they were stylized portrayals only, he committed errors in his otherwise meticulous description