Zobrazeno 1 - 10
of 444
pro vyhledávání: '"Hänsel, W."'
Autor:
Monz, T., Kim, K., Villar, A. S., Schindler, P., Chwalla, M., Riebe, M., Roos, C. F., Häffner, H., Hänsel, W., Hennrich, M., Blatt, R.
Any residual coupling of a quantum computer to the environment results in computational errors. Encoding quantum information in a so-called decoherence-free subspace provides means to avoid these errors. Despite tremendous progress in employing this
Externí odkaz:
http://arxiv.org/abs/0909.3715
Publikováno v:
New J. Phys. 11 (2009) 103008
In the endeavour to scale up the number of qubits in an ion-based quantum computer several groups have started to develop miniaturized ion traps for extended spatial control and manipulation of the ions. Shuttling and separation of ion strings have b
Externí odkaz:
http://arxiv.org/abs/0906.5335
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
Autor:
Monz, T., Kim, K., Hänsel, W., Riebe, M., Villar, A., Schindler, P., Chwalla, M., Hennrich, M., Blatt, R.
Algorithms for quantum information processing are usually decomposed into sequences of quantum gate operations, most often realized with single- and two- qubit gates[1]. While such operations constitute a universal set for quantum computation, gates
Externí odkaz:
http://arxiv.org/abs/0804.0082
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
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
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
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
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
Publikováno v:
New J. Phys. 7 (2005) 3
We present a toolbox for cold atom manipulation with time-dependent magnetic fields generated by an atom chip. Wire layouts, detailed experimental procedures and results are presented for the following experiments: Use of a magnetic conveyor belt for
Externí odkaz:
http://arxiv.org/abs/quant-ph/0411012