Coherent shuttle of electron-spin states

Abstract

Qubit transfer: Shuttling single spins with quantum dots A technique enables transferring single spin qubits across an array of quantum dots while their phase coherence is preserved. In this manner, spatially separated registers of stationary qubits can be coherently linked, allowing building scalable qubit networks. Scientists at QuTech from Delft University of Technology spatially shuttle qubits by preparing empty quantum dots and adiabatically shuttling electrons through these dots using tailored gate voltage pulses. Through interference measurements, they observe phase oscillations that allow quantifying the fidelity of the shuttling operation. Numerical simulations support the estimated fidelity of single-spin transfer and point at possible improvements for separating entangled spin pairs.