High temperature superconducting surface ion traps.

Traps are known to be a good tool to perform quantum simulations [1] and quantum computation [2]. Large scale quantum systems can be achieved by surface ion traps. However, the closeness of the ions to the trap's surface leads to an increase of the heating rate of the motional state, which degrades the fidelity of quantum operations. The origin of this heating is not well understood [3]. understand different sources of motional heating, we use a surface ion trap made of YBCO, a high-temperature superconducting material. We designed our trap in such a way that Johnson noise is the dominant source of motional heating above the critical temperature Tc, whereas below Tc it should be negligible compared to other noise sources. By measuring the motional heating rate of a trapped ion, we observe large changes in the magnitude of the electric field noise in a small temperature range around Tc, which is consistent with our calculations. demonstrates an effect of the Johnson noise on the heating rate of the ion. [1] R. Blatt and C.F. Roos, Nature Phys. 8, 277 (2012) [2] . Blatt and D. Wineland, Nature 453, 1008 (2008) [3] M. Brownnutt, M. Kumph, P. Rabl, and R. Blatt, Rev. Mod. Phys. 87, 1419 (2015)