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Spin qubits on semiconductors: from fundamentals to the way of scale-up

Data: Giovedì 21 ottobre 2021, ore 11.00
ONLINE: https://global.gotomeeting.com/join/926972501
Relatore: Alessandro Crippa (NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore)

Titolo: Spin qubits on semiconductors: from fundamentals to the way of scale-up

Abstract: Super and semiconductors represent the two most relevant categories of conductors for quantum technology. When employed in nanodevices properly engineered, these materials can be used to implement the quantum counterpart of bits, called qubits. So far, among the two classes of materials mentioned above, the leading role in the quest for a platform for quantum computation has been taken by the superconducting qubits, mainly in the architectures of flux qubits and transmon qubits. However, semiconductor spin qubits are gaining interest due to the compatibility with industrial fabrication techniques and long coherence times. Lately, a 4-qubit processor based on single holes spins in a 4-quantum dot structure on planar Ge has demonstrated universal quantum logic [arXiv:2109.07837 (2021)]; on top, rumors report that experiments with 16 qubits on a 4x4 qubit array are on the way. The 53 qubits by Google [Nature 574, 505 (2019)] or the 66 qubits recently fabbed in China [arXiv 2106.14734 (2021)] are not within reach yet, but they don’t look impossible to catch in few years.

In this talk, I’ll try to analyze the reason of this impressive growth of the spin qubits field, from both a development of materials and a physics perspective; I’ll focus on the materials I’ve worked on, i.e. Si and Ge. Then, I’ll briefly discuss my present activity on gate-induced current modulation in all-metallic superconducting wires and the qubit implementation of such a platform.

Host:
Fabio Taddei fabio.taddei@nano.cnr.it
Stefan Heun stefan.heun@nano.cnr.it

[Ultimo aggiornamento: 11/10/2021 12:33:31]