Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Benhelm, J."'
Publikováno v:
Phys. Rev. A 79, 020304 (2009)
In an experiment using the odd calcium isotope 43Ca+ we combine the merits of a high fidelity entangling operation on an optical transition (optical qubit) with the long coherence times of two 'clock' states in the hyperfine ground state (hyperfine q
Externí odkaz:
http://arxiv.org/abs/0812.1976
Publikováno v:
New. J. Phys. 11, 023002 (2009)
We give a detailed description of the implementation of a Molmer-Sorensen gate entangling two Ca+ ions using a bichromatic laser beam near-resonant with a quadrupole transition. By amplitude pulse shaping and compensation of AC-Stark shifts we achiev
Externí odkaz:
http://arxiv.org/abs/0810.0670
Publikováno v:
Eur. Phys. J. D 50, 13 (2008)
We perform precision measurements of the branching ratios of the 4P3/2 level decay of a single 40Ca+ ion suspended in a linear Paul trap. High precision is achieved by a novel technique based on monitoring the population transfer when repeatedly pump
Externí odkaz:
http://arxiv.org/abs/0807.2905
Autor:
Chwalla, M., Benhelm, J., Kim, K., Kirchmair, G., Monz, T., Riebe, M., Schindler, P., Villar, A. S., Haensel, W., Roos, C. F., Blatt, R., Abgrall, M., Santarelli, G., Rovera, G. D., Laurent, Ph.
Publikováno v:
Phys. Rev. Lett. 102, 023002 (2009)
We report on the first absolute transition frequency measurement at the 10^{-15} level with a single, laser-cooled 40Ca+ ion in a linear Paul trap. For this measurement, a frequency comb is referenced to the transportable Cs atomic fountain clock of
Externí odkaz:
http://arxiv.org/abs/0806.1414
Publikováno v:
Phys. Rev. A 77, 062306 (2008)
For quantum information processing (QIP) with trapped ions, the isotope 43Ca+ offers the combined advantages of a quantum memory with long coherence time, a high fidelity read out and the possibility of performing two qubit gates on a quadrupole tran
Externí odkaz:
http://arxiv.org/abs/0804.1261
Publikováno v:
Nature Physics 4, 463 (2008)
Today ion traps are among the most promising physical systems for constructing a quantum device harnessing the computing power inherent in the laws of quantum physics. The standard circuit model of quantum computing requires a universal set of quantu
Externí odkaz:
http://arxiv.org/abs/0803.2798
Publikováno v:
Phys. Rev. A 76, 040303(R) 2007
We propose the implementation of a geometric-phase gate on magnetic-field-insensitive qubits with $\hat{\sigma}^z$-dependent forces for trapped ion quantum computing. The force is exerted by two laser beams in a Raman configuration. Qubit-state depen
Externí odkaz:
http://arxiv.org/abs/0707.3916
Publikováno v:
New J. Phys. 9, 211 (2007)
The performance of a quantum teleportation algorithm implemented on an ion trap quantum computer is investigated. First the algorithm is analyzed in terms of the teleportation fidelity of six input states evenly distributed over the Bloch sphere. Fur
Externí odkaz:
http://arxiv.org/abs/0704.2027
Publikováno v:
Phys. Rev. A 75, 032506 (2007)
The hyperfine structure of the S1/2-D5/2 quadrupole transition at 729 nm in 43Ca+ has been investigated by laser spectroscopy using a single trapped 43Ca+ ion. We determine the hyperfine structure constants of the metastable level as A=-3.8931(2) MHz
Externí odkaz:
http://arxiv.org/abs/physics/0611134
Autor:
Haeffner, H., Haensel, W., Roos, C. F., Benhelm, J., Chek-al-kar, D., Chwalla, M., Koerber, T., Rapol, U. D., Riebe, M., Schmidt, P. O., Becher, C., Gühne, O., Dür, W., Blatt, R.
Publikováno v:
Nature 438, 643-646 (2005)
Among the various kinds of entangled states, the 'W state' plays an important role as its entanglement is maximally persistent and robust even under particle loss. Such states are central as a resource in quantum information processing and multiparty
Externí odkaz:
http://arxiv.org/abs/quant-ph/0603217