SpIn-orbitronic QuAntum bits in Reconfigurable 2D-Oxides

Introduction

The quest for the realization of "fault tolerant" quantum computation is currently challenged by the extreme fragility of quantum effects with respect to noise and decoherence. Quantum control, quantum initialization, read-out, and enhanced coherence remain the main challenges that need to be addressed in a scalable multi-qubit platform.

Advancements in Spin-Orbitronics

In the last few years, there have been tremendous advancements in the field of spin-orbitronics, where the spin degrees of freedom are manipulated with electric fields through the spin-momentum locking of electrons.

Importance of Spin-Orbit Coupling

In spite of its importance, this property of materials characterized by large and tunable spin-orbit coupling (SOC), such as two-dimensional (2D) oxide materials, is not fully exploited in quantum computation.

Proposed Solution

Here, we propose spin-orbitronics qubits and their experimental realization in single and double quantum dots based on 2D electron gases (2DEGs) formed at SrTiO3-based oxide interfaces.

Characteristics of Oxide Interfaces

Due to their large spin-orbit splitting and gate-tunability, oxide interfaces are characterized by:

• An exceptional degree of spin-momentum locking
• A unique combination of high mobility and 2D magnetism

Advantages of the Proposed Platform

The exploitation of largely tunable SOC and spin-polarization in 2D systems, in combination with the tunability of the host materials, is very attractive for a novel quantum computation platform. This allows for:

1. Coherent quantum control of individual electron spins using spin-to-charge interconversion.
2. Practical implementation of an innovative quantum computation approach.
3. Upscaling to a large number of qubits, going beyond one-dimensional interconnect schemes.

Conclusion

The proposed platform has all the characteristics for practical implementation, offering important fundamental and technological advantages based on spin-orbitronics.