Spin-qubits device with nanomagnets for shuttling-based quantum gates and methods of operating the spin-qubits device

Abstract

The disclosure relates to a spin-qubits device (1) for hosting a two-dimensional array of quantum-dot regions (300) for hosting a plurality of spin-qubits (900). The spin-qubits device (1) comprises: a semiconductor multilayer (30) disposed on a substrate (10); a gate layer (50) disposed on the semiconductor multilayer (30), the gate layer (50) comprising a plurality of control gates (500) configured to control the two-dimensional array of quantum-dot regions (300) in the semiconductor multilayer (30); characterized by further comprising: a periodic two-dimensional array of nanomagnets (700) configured to provide a spatially-periodic magnetic-stray-field configuration in the two-dimensional array of quantum-dot regions (3 00); the spatially-periodic magnetic-stray-field configuration for performing shuttling-based quantum gates (G1; G2) that involve shuttling one or more spin-qubits (911; 942) through quantum-dot regions (311-322; 342-333). The invention has applications in quantum computing and quantum simulations, for example by a quantum computer that includes one or more instances of the spin-qubits device. [Fig. 2f]