Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Schwemmer, Christian"'
Publikováno v:
Nano Lett. 2019, 19, 8855-8861
Accurate deposition of nanoparticles at defined positions on a substrate is still a challenging task, because it requires simultaneously stable long-range transport and attraction to the target site and precise short-range orientation and deposition.
Externí odkaz:
http://arxiv.org/abs/2009.04904
Autor:
Nicollier, Philippe, Schwemmer, Christian, Ruggeri, Francesca, Widmer, Daniel, Ma, Xiaoyu, Knoll, Armin W.
Publikováno v:
Phys. Rev. Applied 15, 034006 (2021)
We present a nanoparticle size-separation device based on a nanofluidic rocking Brownian motor. It features a ratchet-shaped electrostatic particle potential with increasing barrier heights along the particle transport direction. The sharp drop of th
Externí odkaz:
http://arxiv.org/abs/2007.04179
Autor:
Skaug, Michael J., Schwemmer, Christian, Fringes, Stefan, Rawlings, Colin D., Knoll, Armin W.
Publikováno v:
Science 359, 1505-1508 (2018)
Control and transport of nanoscale objects in fluids is challenging because of the unfavorable scaling of most interaction mechanisms to small length scales. We design energy landscapes for nanoparticles by accurately shaping the geometry of a nanofl
Externí odkaz:
http://arxiv.org/abs/1808.08147
Publikováno v:
Phys. Rev. Lett. 121, 104102 (2018)
A reversal of the particle current in rocking Brownian motors was predicted more than 20 years ago; however, an experimental verification and a deeper insight into the underlying mechanisms remained elusive. Here, we investigate the high frequency be
Externí odkaz:
http://arxiv.org/abs/1805.03993
Autor:
Vaidman, Lev, Ben-Israel, Alon, Dziewior, Jan, Knips, Lukas, Weißl, Mira, Meinecke, Jasmin, Schwemmer, Christian, Ber, Ran, Weinfurter, Harald
Publikováno v:
Phys. Rev. A 96, 032114 (2017)
It is argued that a weak value of an observable is a robust property of a single pre- and post-selected quantum system rather than a statistical property. During an infinitesimal time a system with a given weak value affects other systems as if it we
Externí odkaz:
http://arxiv.org/abs/1611.03989
Autor:
Knips, Lukas, Schwemmer, Christian, Klein, Nico, Reuter, Jonas, Tóth, Géza, Weinfurter, Harald
The statistical nature of measurements alone easily causes unphysical estimates in quantum state tomography. We show that multinomial or Poissonian noise results in eigenvalue distributions converging to the Wigner semicircle distribution for already
Externí odkaz:
http://arxiv.org/abs/1512.06866
Publikováno v:
Phys. Rev. Lett. 117, 210504 (2016)
Certifying entanglement of a multipartite state is generally considered as a demanding task. Since an $N$ qubit state is parametrized by $4^{N}-1$ real numbers, one might naively expect that the measurement effort of generic entanglement detection al
Externí odkaz:
http://arxiv.org/abs/1412.5881
Autor:
Schwemmer, Christian, Knips, Lukas, Tran, Minh Cong, de Rosier, Anna, Laskowski, Wieslaw, Paterek, Tomasz, Weinfurter, Harald
Publikováno v:
Phys. Rev. Lett. 114, 180501 (2015)
Non-classical correlations between measurement results make entanglement the essence of quantum physics and the main resource for quantum information applications. Surprisingly, there are $n$-particle states which do not exhibit $n$-partite correlati
Externí odkaz:
http://arxiv.org/abs/1410.2367
Autor:
Schwemmer, Christian, Toth, Geza, Niggebaum, Alexander, Moroder, Tobias, Gross, David, Gühne, Otfried, Weinfurter, Harald
Publikováno v:
Phys. Rev. Lett. 113, 040503 (2014)
Quantum state tomography suffers from the measurement effort increasing exponentially with the number of qubits. Here, we demonstrate permutationally invariant tomography for which, contrary to conventional tomography, all resources scale polynomiall
Externí odkaz:
http://arxiv.org/abs/1401.7526
Autor:
Schwemmer, Christian, Knips, Lukas, Richart, Daniel, Moroder, Tobias, Kleinmann, Matthias, Gühne, Otfried, Weinfurter, Harald
Publikováno v:
Phys. Rev. Lett. 114, 080403 (2015)
Common tools for obtaining physical density matrices in experimental quantum state tomography are shown here to cause systematic errors. For example, using maximum likelihood or least squares optimization for state reconstruction, we observe a system
Externí odkaz:
http://arxiv.org/abs/1310.8465