| QuTech 360 seminar: Shared control of a 16 semiconductor quantum dot crossbar array by Francesco Borsoi |
Date: Wednesday 28 September
Time: 16.00–17.00h
Location: Building 22, Conference room (4th floor) and online
Link: https://studioconvex.zoom.us/j/85477318920?pwd=cFZXMzNuVjhyL0w3eGVNKyt5dXZRZz09
Meeting ID: 854 7731 8920
Passcode: 529695
Abstract
The efficient control of a large number of qubits is one of most challenging aspects for practical quantum computing. Current approaches in solid-state quantum technology are based on brute-force methods, where each and every qubit requires at least one unique control line, an approach that will become unsustainable when scaling to the required millions of qubits. In our work, inspired by random access architectures in classical electronics, we introduce the shared control of semiconductor quantum dots to efficiently operate a two-dimensional crossbar array in planar germanium. We tune the entire array, comprising 16 quantum dots, to the few-hole regime and, to isolate an unpaired spin per dot, we confine an odd number of holes in each site. Moving forward, we establish a method for the selective control of the quantum dots interdot coupling and achieve a tunnel coupling tunability over more than 10 GHz. The operation of a quantum electronic device with fewer control terminals than tunable experimental parameters represents a compelling step forward in the construction of scalable quantum technology.
Biography of Francesco Borsoi
Francesco Borsoi received an MSc in Physics from the University of Pisa (2016) and a PhD in Applied Physics from the Delft University of Technology (2021). As a doctoral researcher, Francesco shaped his expertise in quantum devices based on coupled semiconductor and superconductor materials. He contributed to the development of new fabrication paradigms that have significantly improved the quality, reproducibility and fabrication turnaround of these fragile devices. Next, he employed quantum transport and radiofrequency methods to testbed readout methods of topological qubits. In 2021, he joined the Veldhorst group in QuTech. He is now focusing on quantum devices based on planar germanium with the aim to realise and operate a functional modular tile of quantum dot spin qubits.
About QuTech360 seminars
QuTech360 is a series of seminars for all QuTech divisions where they have the opportunity to build a deep understanding of the topics researched at QuTech. In each seminar, a quantum expert will guide us through one of the main topics studied in their group. For more information, you can contact Grazia Bastasin (g.bastasin@tudelft.nl) |
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| QuTech |
| QuTech is the advanced research center for quantum computing and quantum internet. It is a partnership between Delft University of Technology (TU Delft) and the Netherlands Organization for Applied Scientific Research (TNO), founded in 2014. |
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