caa a22 4500 528786059 20190713030955.0 cr unu---uuuuu 180924s2015 xx s 000 0 eng 10.3929/ethz-b-000106305 doi 10.1038/ncomms9757 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/106305 Measurement of geometric dephasing using a superconducting qubit [Elektronische Daten] [Stefan Berger, Marek Pechal, Philipp Kurpiers, Abdufarrukh A. Abdumalikov, Christopher Eichler, Jonas A. Mlynek, Alexander G. Shnirman, Yuval Gefen, Andreas Wallraff, Stefan Filipp] Nat Commun Open access ethresearch A quantum system interacting with its environment is subject to dephasing, which ultimately destroys the information it holds. Here we use a superconducting qubit to experimentally show that this dephasing has both dynamic and geometric origins. It is found that geometric dephasing, which is present even in the adiabatic limit and when no geometric phase is acquired, can either reduce or restore coherence depending on the orientation of the path the qubit traces out in its projective Hilbert space. It accompanies the evolution of any system in Hilbert space subjected to noise. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Berger Stefan joint author Pechal Marek joint author Kurpiers Philipp joint author Abdumalikov Abdufarrukh A. joint author Eichler Christopher joint author Mlynek Jonas A. joint author Shnirman Alexander G. joint author Gefen Yuval joint author Wallraff Andreas joint author Filipp Stefan joint author Nature Communications London : Nature Publishing Group 6, p. 8757 2041-1723 http://hdl.handle.net/20.500.11850/106305 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/106305 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Berger Stefan joint author ETHRESEARCH 700 1- Pechal Marek joint author ETHRESEARCH 700 1- Kurpiers Philipp joint author ETHRESEARCH 700 1- Abdumalikov Abdufarrukh A. joint author ETHRESEARCH 700 1- Eichler Christopher joint author ETHRESEARCH 700 1- Mlynek Jonas A. joint author ETHRESEARCH 700 1- Shnirman Alexander G. joint author ETHRESEARCH 700 1- Gefen Yuval joint author ETHRESEARCH 700 1- Wallraff Andreas joint author ETHRESEARCH 700 1- Filipp Stefan joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 6, p. 8757 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access