2013/02/28 by S. Berger, M. Pechal, A. A. Abdumalikov Jr. +5 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #quant-ph
paper · pdf · doi:10.1103/physreva.87.060303
published as Physical Review A, 060303(R) (2013) · 5 pages, 4 figures
arxiv created 2013/06/26 · arxiv updated 2013/06/27
We make use of a superconducting qubit to study the effects of noise on adiabatic geometric phases. The state of the system, an effective spin one-half particle, is adiabatically guided along a closed path in parameter space and thereby acquires a geometric phase. By introducing artificial fluctuations in the control parameters, we measure the geometric contribution to dephasing for a variety of noise powers and evolution times. Our results clearly show that only fluctuations which distort the path lead to geometric dephasing. In a direct comparison with the dynamic phase, which is path-independent, we observe that the adiabatic geometric phase is less affected by noise-induced dephasing. This observation directly points towards the potential of geometric phases for quantum gates or metrological applications.