Search for correlation effects in linear chains of trapped ions

We report a precise search for correlation effects in linear chains of 2 and 3 trapped Ca+ ions. Unexplained correlations in photon emission times within a linear chain of trapped ions have been reported, which, if genuine, cast doubt on the potential of an ion trap to realize quantum information processing. We observe quantum jumps from the metastable 3d 2D_{5/2} level for several hours, searching for correlations between the decay times of the different ions. We find no evidence for correlations: the number of quantum jumps with separations of less than 10 ms is consistent with statistics to within errors of 0.05%; the lifetime of the metastable level derived from the data is consistent with that derived from independent single-ion data at the level of the experimental errors 1%; and no rank correlations between the decay times were found with sensitivity to rank correlation coefficients at the level of |R| = 0.024.Comment: With changes to introduction. 5 pages, including 4 figures. Submitted to Europhys. Let

Probabilistic state preparation of a single molecular ion by projection measurement

We show how to prepare a single molecular ion in a specific internal quantum state in a situation where the molecule is trapped and sympathetically cooled by an atomic ion and where its internal degrees of freedom are initially in thermal equilibrium with the surroundings. The scheme is based on conditional creation of correlation between the internal state of the molecule and the translational state of the collective motion of the two ions, followed by a projection measurement of this collective mode by atomic ion shelving techniques. State preparation in a large number of internal states is possible.Comment: 4 pages, 2 figures, 2 table

Lifetime measurement of the metastable 3d 2D5/2 state in the 40Ca+ ion using the shelving technique on a few-ion string

We present a measurement of the lifetime of the metastable 3d 2D5/2 state in the 40Ca+ ion, using the so-called shelving technique on a string of five Doppler laser-cooled ions in a linear Paul trap. A detailed account of the data analysis is given, and systematic effects due to unwanted excitation processes and collisions with background gas atoms are discussed and estimated. From a total of 6805 shelving events, we obtain a lifetime tau=1149+/-14(stat.)+/-4(sys.)ms, a result which is in agreement with the most recent measurements.Comment: 10 pages, 7 figures. Submitted for publicatio

How to Find a Book

Classification system to arrange books on the shelves. Each book has a unique call number that begins with one, two, or three capital letters followed by numbers. To locate a book for which you have the call number, the following types of order must be considered: Alphabetical order The first line of the call number is always alphabetical by one, two, or three letters: L, LA, LB, LC, etc. Numerical order The second line of the call number is always numerical 1, 2, 3, etc. 2327 is shelved before 2328 Decimal order The third and fourth lines of the call number are alphabetical and decimal.C554 is shelved before.C63 (.C630);.Z8999 is shelved before.Z948 (.Z9480) ♦ Work from the top line of the call number to the bottom line

\u3ci\u3eLoss of Vision\u3c/i\u3e: A Sequence of Five Median Odes

Within this room of shelved books I sit and muse upon the greater odes I read

The Cyborg Griffin: a Speculative Literary Journal

Notes: copyrighted Hollins Student Publication Scope: short stories, artwork, poetry, essays, and comics Paper copies shelved in University Archives.https://digitalcommons.hollins.edu/cyborg/1004/thumbnail.jp