RQC Colloquium

46th RQC Colloquium

• Speaker

  Dr. Lars Schreiber
  (RWTH Aachen University)

• Date

  Monday, June 15, 2026, 16:00-17:00 (4:00p.m.-5:00p.m.) (JST)

• Venue

  Hybrid (Zoom・Large Meeting Room, 2F, Welfare and Conference Building, Wako Campus / 和光地区 統合支援施設2階 大会議室 (C61))

• Title

  Scalability with conveyor-belt spin-qubit shuttling in Si/SiGe

• Inquiries

  rqc_colloquium_inquiry[at]ml.riken.jp

• Registration Form

  https://krs2.riken.jp/m/rqc_registration_form

Abstract
Conveyor-belt shuttling transports single electron spin qubits adiabatically in a propagating sinusoidal potential defined by gate electrodes in a Si/SiGe quan-tum channel. This approach relies on purely electrical control with only a few tunable signals and is compatible with industrial fabrication processes. Im-portantly, the electron spin state can be preserved during transport in Si/SiGe devices. Mobile spin qubits enable new approaches to qubit manipulation, re-duce cross-talk and might enhance the spin qubit connectivity.

I discuss integrating mobile qubits into sparse quantum-computing architectures compatible with cryogenic electronics. To fully exploit spin-qubit shuttling, linear shuttle lanes must be extended into two-dimensional grids with controllable electron routing. I show how T-junctions between shuttle lanes can be realized without additional control lines. I further present how conveyor-mode shuttling can generate two-dimensional maps of local material properties, including electrostatic disorder, valley splitting, and complex intervalley coupling, providing feedback for mitigation strategies and benchmarking material improvements.
Flyer: 46th RQC Colloquium Flyer