Crossed Andreev reflection in an InSb 2DEG in the quantum Hall state

We embark on a novel approach to engineer a superconducting topological state of matter utilizing integer quantum hall (QH) edge states, coupled via crossed Andreev reflection (CAR) through a thin superconducting strip. This proposal has advantages in terms of control and manipulation of Majorona modes - building blocks for protected quantum information manipulation. Challenges arise due to conflicting requirements of a large magnetic field (to enter the QH regime), induced superconductivity and large superconducting coherence length of the strip. As a promising platform to implement this proposal, we use an InSb two-dimensional electron gas, which has high mobility and large g-factor, allowing to access ν=1 regime at fields around 3T. In addition, it has a large spin-orbit interaction, which is required to couple spin-polarized electrons through a superconductor. We implement and test several types of surface and side contacts of a high critical field Nb-based superconductors. We then explore behavior of the system in QH regime, where signatures of CAR are expected.