Operating Semiconductor Qubits without Individual Barrier Gates
Alexander S. Ivlev (TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Damien R. Crielaard (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab)
Marcel Meyer (TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
William I.L. Lawrie (TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Nico W. Hendrickx (TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Amir Sammak (TU Delft - EKL-Users, TU Delft - BUS/TNO STAFF)
Yuta Matsumoto (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab)
Lieven M.K. Vandersypen (Kavli institute of nanoscience Delft, TU Delft - QCD/Vandersypen Lab, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Vandersypen Lab)
Giordano Scappucci (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab, TU Delft - Quantum Circuit Architectures and Technology, Kavli institute of nanoscience Delft)
Corentin Déprez (TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Menno Veldhorst (TU Delft - QCD/Veldhorst Lab, TU Delft - QN/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
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Abstract
Semiconductor spin qubits have emerged as a promising platform for quantum computing, following a significant improvement in their control fidelities over recent years. Increasing the qubit count remains challenging, beginning with the fabrication of small features and complex fan-outs. A particular challenge has been formed by the need for individual barrier gates to control the exchange interaction between adjacent spin qubits. Here, we propose a method to vary two-qubit interactions without applying pulses on individual barrier gates while also remaining insensitive to detuning noise in first order. Experimentally we find that changing plunger gate voltages over 300 mV can tune the exchange energy J from 100 kHz to 60 MHz. This allows us to perform two-qubit operations without changing the barrier gate voltage. Based on these findings we conceptualize a spin qubit architecture without individual barrier gates, simplifying the fabrication while maintaining the control necessary for universal quantum computation.