Výsledky vyhledávání

Report

Measurement of the hyperfine structure of the S1/2-D5/2 transition in 43Ca+

Autor: Benhelm, J., Kirchmair, G., Rapol, U., Koerber, T., Roos, C. F., Blatt, R.

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

Zobrazit plný text záznamu

Report

Process tomography of ion trap quantum gates

Autor: Riebe, M., Kim, K., Schindler, P., Monz, T., Schmidt, P. O., Koerber, T. K., Haensel, W., Haeffner, H., Roos, C. F., Blatt, R.

Publikováno v: Phys. Rev. Lett. 97, 220407 (2006)

A crucial building block for quantum information processing with trapped ions is a controlled-NOT quantum gate. In this paper, two different sequences of laser pulses implementing such a gate operation are analyzed using quantum process tomography. F

Externí odkaz: http://arxiv.org/abs/quant-ph/0609228

Zobrazit plný text záznamu

Report

Scalable multi-particle entanglement of trapped ions

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

Zobrazit plný text záznamu

Report

Robust state preparation of a single trapped ion by adiabatic passage

Autor: Wunderlich, Chr., Hannemann, Th., Koerber, T., Haeffner, H., Roos, Ch., Haensel, W., Blatt, R., Schmidt-Kaler, F.

Publikováno v: Journal of Modern Optics, Volume 54, Issue 11 July 2007 , pages 1541 - 1549

We report adiabatic passage experiments with a single trapped $^{40}$Ca$^+$ ion. By applying a frequency chirped laser pulse with a Gaussian amplitude envelope we reach a transfer efficiency of 0.990(10) on an optical transition from the electronic g

Externí odkaz: http://arxiv.org/abs/quant-ph/0508159

Zobrazit plný text záznamu

Report

Robust entanglement

Autor: Haeffner, H., Schmidt-Kaler, F., Haensel, W., Roos, C. F., Koerber, T., Chwalla, M., Riebe, M., Benhelm, J., Rapol, U. D., Becher, C., Blatt, R.

Publikováno v: Appl. Phys. B 81, 151 (2005)

It is common belief among physicists that entangled states of quantum systems loose their coherence rather quickly. The reason is that any interaction with the environment which distinguishes between the entangled sub-systems collapses the quantum st

Externí odkaz: http://arxiv.org/abs/quant-ph/0508021

Zobrazit plný text záznamu

Report

Precision measurement of light shifts in a single trapped Ba$^+$ ion

Autor: Sherman, J. A., Koerber, T. W., Markhotok, A., Nagourney, W., Fortson, E. N.

Using a single trapped barium ion we have developed an rf spectroscopy technique to measure the ratio of the off-resonant vector ac Stark effect (or light shift) in the 6S_{1/2} and 5D_{3/2} states to 0.1% precision. We find R = Delta_S / Delta_D = -

Externí odkaz: http://arxiv.org/abs/physics/0502113

Zobrazit plný text záznamu