Suppressing On-Chip EM Crosstalk for Spin Qubit Devices

TL;DR

This paper presents a new on-chip interconnect design that significantly reduces electromagnetic crosstalk in spin qubit devices, enabling more reliable multi-qubit operations.

Contribution

The authors introduce a novel interconnect architecture with miniaturized contacts and ground guards to suppress EM crosstalk in spin qubit devices.

Findings

Crosstalk reduced to about 1% from DC to 1 GHz

Design improvements validated by low temperature measurements

Numerical simulations support experimental results

Abstract

We report the development and performance of on-chip interconnects designed to suppress electromagnetic (EM) crosstalk in spin qubit device architectures with the large number of gate electrodes needed for multi- qubit operation. Our design improves the performance of typical device interconnects via the use of minia- turised ohmic contacts and interspersed ground guards. Low temperature measurements and numerical simulation confirm that control and readout signal crosstalk can be suppressed to levels of order 1%, from dc to 1 GHz.