Magnetic flux imaging in a 3D superconductor integrated circuit
ORAL
Abstract
We present the first direct visualization of magnetic flux maps in a superconductor quantum circuit composed of 8 layers with distinct lithographic patterns of superconducting elements. Using high-sensitivity magneto-optical imaging, we observe the flux penetration, concentration, and trapping in complicated 3D assembly of niobium film microstructures in an external fields. The emerging intricate flux distributions reflect not only the induction modulations in the topmost layer but also contributions from the buried superconducting layers. These patterns can be interpreted as arising from meandering Meissner screening currents and flux occupied regions in different components of the circuit. Our observations reveal specific role of shape and mutual position of the circuit elements in the field screening and flux trapping, which may help in the future designs of multilayer superconducting circuits.
*The research by TR, AG, BJ, and VVV was sponsored by the Army Research Office and was accomplished under Grant No. W911NF-24-1-0145. The work at MIT Lincoln Laboratory was supported under Air Force Contract No. FA8702-15-D-0001 or FA8702-25-D-B002. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office and the Air Force or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
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Presenters
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Tong Ren
- University of Notre Dame