Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 35: Superconducting Electronics: SQUIDs, Circuit QED
TT 35.11: Talk
Wednesday, March 20, 2024, 12:15–12:30, H 2053
Hybird high-Tc two dimensional superconductor into quntum circuit — •Haolin Jin1, Giuseppe Serpico1, Christian N. Saggau2, Tommaso Confalone2, Yejin Lee2, Poya Yang1, Edourad Lense1, Nicola Poccia2, and Uri Vool1 — 1Max Planck institute for chemical physics of solids, Dresden, Germany — 2Leibniz Institute for Solide state and Materials Research, Dresden, Germany
In the realm of superconducting quantum devices, van der Waals (vdW) materials are promising due to their high flexibility, relatively small volume, and tunable electronic properties. However, integrating the vdW material into the quantum circuit with high coherence is still an outstanding problem. In this study, we incorporate thin vdW flake of Bi2Sr2CaCu2O8 (BSCCO) into a Nb resonator circuit. The integration of BSCCO at the current antinode transforms the resonant mode, while maintaining a high quality factor (Q 104). Through temperature and power sweeping measurements, we demonstrate that the dissipation attributed to BSCCO in the circuit is predominantly due to interface dielectric losses and its behavior can be modeled by a bath of Two-Level Systems (TLS). By understanding the loss mechanisms in vdW based quantum circuits, we can optimize circuit coherence and pave the way to future hybrid circuits for quantum technology applications.
Keywords: 2D material; high temperature superconductor; quantum circuits; two level system effect; Bi2Sr2CaCu2O8