Si/SiGe QuBus for single electron information-processing devices with memory and micron-scale connectivity function

Nature Communications, vol. 15, pp. 2296

Abstract

Abstract The connectivity within single carrier information-processing devices requires transport and storage of single charge quanta. Single electrons have been adiabatically transported while confined to a moving quantum dot in short, all-electrical Si/SiGe shuttle device, called quantum bus (QuBus). Here we show a QuBus spanning a length of 10 μm and operated by only six simply-tunable voltage pulses. We introduce a characterization method, called shuttle-tomography, to benchmark the potential imperfections and local shuttle-fidelity of the QuBus. The fidelity of the single-electron shuttle across the full device and back (a total distance of 19 μm) is (99.7 ± 0.3) %. Using the QuBus, we position and detect up to 34 electrons and initialize a register of 34 quantum dots with arbitrarily chosen patterns of zero and single-electrons. The simple operation signals, compatibility with industry fabrication and low spin-environment-interaction in 28 Si/SiGe, promises long-range spin-conserving transport of spin qubits for quantum connectivity in quantum computing architectures.

Authors 8

1. Ran Xue Aachen JARA-FIT Institute for Quantum Information

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

2. Inga Seidler Aachen JARA-FIT Institute for Quantum Information

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

3. Simon Humpohl Aachen JARA-FIT Institute for Quantum Information

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   ARQUE Systems GmbH, Aachen, Germany

   JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

4. Jhih‐Sian Tu

   Forschungszentrum Jülich

   Affiliation as printed

   Helmholtz Nano Facility (HNF), Forschungszentrum Jülich, Jülich, Germany

5. Stefan Trellenkamp

   Forschungszentrum Jülich

   Affiliation as printed

   Helmholtz Nano Facility (HNF), Forschungszentrum Jülich, Jülich, Germany

6. Tom Struck Aachen JARA-FIT Institute for Quantum Information

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   ARQUE Systems GmbH, Aachen, Germany

   JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

7. Hendrik Bluhm Aachen JARA-FIT Institute for Quantum Information

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   ARQUE Systems GmbH, Aachen, Germany

   JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

8. Lars R. Schreiber corresponding Aachen ARQUE Systems GmbH JARA-FIT Institute for Quantum Information

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   ARQUE Systems GmbH, Aachen, Germany. lars.schreiber@physik.rwth-aachen.de

   JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany. lars.schreiber@physik.rwth-aachen.de

   ARQUE Systems GmbH, Aachen, Germany