Flying Spin Qubits in Quantum Dot Arrays Driven by Spin-Orbit Interaction

Advancements in Quantum Dot Arrays (QDAs) have improved scalability, enabling new applications in quantum computation and simulation [1]. Hole spin qubits are particularly promising due to their intrinsic Spin-Orbit Interaction (SOI) [2]. This research investigates QDAs as quantum links, highlighting the untapped potential of SOI in long-range transfer protocols. We propose a novel approach using Shortcuts to Adiabaticity (STA) to enable hole-flying qubits in QDAs.

Our results show that tuning hole spin rotation during transfer is possible by adjusting the number of dots and SOI via external electric fields [3]. This allows for efficient one-qubit gate operations and faster entanglement generation through sequences of long-range transfers. A reduced population of intermediate dots minimizes susceptibility to electric field fluctuations. We also introduce strategies to mitigate dephasing by incorporating dynamical decoupling during transfer. Also, we obtain a long-range spin transfer in half-filled QDAs, using SOI and magnetic fields to prevent the population of intermediate states.

In conclusion, our study offers key insights into long-range quantum transfer in QDAs, addressing scalability challenges in quantum computing. We propose QDAs as a practical solution for connecting computational nodes in sparse quantum chip architectures.

[1] A. Zwerver, et al., PRX Quantum 4, 030303 (2023)

[2] N. W. Hendrickx, et al., Nature 591, 580 (2021)

[3] D. Fernández-Fernández, arXiv: 2312.04631 (2023)