Spin quantum computing – Mónica Benito

The possibility to access the quantum nature of matter at the mesoscopic level has opened a new era in condensed matter physics. Its success is based on the low dimensionality reached for the charge carriers, i.e., on the strong confinement of spatial dimensions to length scales comparable to the particle’s wavelength.

Quantum dots (QDs) are nanostructures hosted in semiconductors where a few electrons can be electrostatically trapped in discrete states. Therefore, QDs allow us to access and control the quantum nature of single electrons and interactions between them. Since the first measurements of few-electron phenomena in lateral gated QDs, the focus of applications of these systems has shifted from single spintronics toward quantum information science, as originally envisioned by Loss and DiVincenzo.

My main research interests in this field are the coupling between distant spin qubits and the control over negative influences of the environment with the goal of a scalable design of useful quantum devices based on this promising qubit platform.

Related Publications

Blueprint for quantum computing with electrons in Helium

We theoretically propose a new way to realize qubits: a hybrid qubit system consisting of the quantized vertical motion (Rydberg states) and the spin states of electrons on the surface of liquid helium.

Hole-spin qubits in Ge nanowire quantum dots: Interplay of orbital magnetic field, strain, and growth direction

Hole-spin qubits in quasi-one-dimensional structures are a promising platform for quantum information processing because of the strong spin-orbit interaction (SOI). We present analytical results and discuss device designs that optimize the SOI in Ge semiconductors.

Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power

We propose a minimal design modification of Ge planar quantum dot devices that enhances the spin-orbit interaction by orders of magnitude and enables low power ultrafast hole-spin qubit operations.

Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits

Versatile set of quantum gates between qubits of a spin quantum computer node.

Hybrid superconductor-semiconductor systems for quantum technology

Perspectives article in Applied Physics Letters special topic Hybrid Quantum Devices. We summarize recent progress and theoretical models that describe superconducting-semiconducting hybrid quantum systems, explain the limitations of these systems, and describe different directions where future experiments and theory are headed.