Measurement of the lifetime of the 3d2D5/2 state in 40Ca+
Physical Review A - Atomic, Molecular, and Optical Physics 62:3 (2000) 032503-032501
Abstract:
A linear ion trap apparatus was used to measure the lifetime of the D5/2 level in 40Ca+ by quantum jump measurements on a single trapped ion. Compared to previous measurements, more precise and significantly larger results were obtained. Overall, the apparatus provided a precise test of ab initio atomic structure calculations.Search for correlation effects in linear chains of trapped Ca+ ions
Europhysics Letters 51:4 (2000) 388-394
Abstract:
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 met astable 3d2 D5/2 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.Quantumenhanced information processing
Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences The Royal Society 358:1765 (2000) 261-279
Beyond bits: The future of quantum information processing
Computer 33:1 (2000) 38-45
Abstract:
Quantum information theory seeks to unite some of the most influential ideas of 20th century science: quantum mechanics, computer science and information theory. The development of quantum information theory has only begun, and only a few applications are known, mostly in quantum system control and data security. The future of the theory is hard to predict, but it seems poised to contribute to some of the most exciting ideas of the 21st century. This theory gives an ideal framework for developing a better understanding of how nature works and what it will allow to be done.Physicists triumph at guess my number
Physics Today 53:2 (2000) 35-39