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pro vyhledávání: '"Lisenfeld, J."'
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Autor:
Grabovskij, G. J., Bushev, P., Cole, J. H., Müller, C., Lisenfeld, J., Lukashenko, A., Ustinov, A. V.
Publikováno v:
New J. Phys. 13, 063015 (2011)
In the microscopic world, multipartite entanglement has been achieved with various types of nanometer sized two-level systems such as trapped ions, atoms and photons. On the macroscopic scale ranging from micrometers to millimeters, recent experiment
Externí odkaz:
http://arxiv.org/abs/1102.5037
Autor:
Cole, J. H., Müller, C., Bushev, P., Grabovskij, G. J., Lisenfeld, J., Lukashenko, A., Ustinov, A. V., Shnirman, A.
Publikováno v:
Appl. Phys. Lett. 97, 252501 (2010)
We use high-precision spectroscopy and detailed theoretical modelling to determine the form of the coupling between a superconducting phase qubit and a two-level defect. Fitting the experimental data with our theoretical model allows us to determine
Externí odkaz:
http://arxiv.org/abs/1010.6037
We present experimental results on a dispersive scheme for reading out a Josephson phase qubit. A capacitively shunted dc-SQUID is used as a nonlinear resonator which is inductively coupled to the qubit. We detect the flux state of the qubit by measu
Externí odkaz:
http://arxiv.org/abs/1010.0954
Autor:
Kaiser, Christoph, Meckbach, J. M., Ilin, K., Lisenfeld, J., Schäfer, R., Ustinov, A. V., Siegel, M.
Publikováno v:
Supercond. Sci. Technol. 24, 035005 (2011)
We have developed a combined photolithography and electron-beam lithography fabrication process for sub-\mum to \mum-size Nb/Al-AlOx/Nb Josephson junctions. In order to define the junction size and protect its top electrode during anodic oxidation, w
Externí odkaz:
http://arxiv.org/abs/1009.0167
Autor:
de Groot, P. C., Lisenfeld, J., Schouten, R. N., Ashhab, S., Lupascu, A., Harmans, C. J. P. M., Mooij, J. E.
Publikováno v:
Nature Physics 6, 763 (2010)
Controlled manipulation of quantum states is central to studying natural and artificial quantum systems. If a quantum system consists of interacting sub-units, the nature of the coupling may lead to quantum levels with degenerate energy differences.
Externí odkaz:
http://arxiv.org/abs/1008.1294
Autor:
de Groot, P. C., van Loo, A. F., Lisenfeld, J., Schouten, R. N., Lupascu, A., Harmans, C. J. P. M., Mooij, J. E.
Publikováno v:
Appl. Phys. Lett. 96, 123508 (2010); (3 pages)
We present experimental results on the crosstalk between two AC-operated dispersive bifurcation detectors, implemented in a circuit for high-fidelity readout of two strongly coupled flux qubits. Both phase-dependent and phase-independent contribution
Externí odkaz:
http://arxiv.org/abs/1008.1277
Autor:
Lisenfeld, J., Müller, C., Cole, J. H., Bushev, P., Lukashenko, A., Shnirman, A., Ustinov, A. V.
Publikováno v:
Phys. Rev. Lett. 105, 230504 (2010)
We demonstrate a new method to directly manipulate the state of individual two-level systems (TLS) in phase qubits. It allows one to characterize the coherence properties of TLS using standard microwave pulse sequences, while the qubit is used only f
Externí odkaz:
http://arxiv.org/abs/1008.0337
Autor:
Forn-Díaz, P., Lisenfeld, J., Marcos, D., García-Ripoll, J. J., Solano, E., Harmans, C. J. P. M., Mooij, J. E.
Publikováno v:
Phys. Rev. Lett. 105, 237001 (2010)
We measure the dispersive energy-level shift of an $LC$ resonator magnetically coupled to a superconducting qubit, which clearly shows that our system operates in the ultrastrong coupling regime. The large mutual kinetic inductance provides a couplin
Externí odkaz:
http://arxiv.org/abs/1005.1559
Autor:
Feofanov, A. K., Oboznov, V. A., Bol'ginov, V. V., Lisenfeld, J., Poletto, S., Ryazanov, V. V., Rossolenko, A. N., Khabipov, M., Balashov, D., Zorin, A. B., Dmitriev, P. N., Koshelets, V. P., Ustinov, A. V.
The difference between the phases of superconducting order parameter plays in superconducting circuits the role similar to that played by the electrostatic potential difference required to drive a current in conventional circuits. This fundamental pr
Externí odkaz:
http://arxiv.org/abs/1005.1581