In this QuTech360 seminar, Marta Pita-Vidal, PhD candidate in Kouwenhoven Lab, Qubit Research Division at QuTech, discusses the direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit. For biography and abstract, please see the description below.

Title:
Direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit

Speaker:
Marta Pita-Vidal

Abstract:
Spin qubits in semiconductors are currently one of the most promising architectures for quantum computing. However, they face challenges in realizing multi-qubit interactions over extended distances. Superconducting spin qubits (or Andreev spin qubits) provide a promising alternative by encoding a qubit in the spin degree of freedom of an Andreev level.
In this talk, I will present our recent results on the implementation of an InAs/Al nanowire-based Andreev spin qubit. We encode the qubit in the spin-split doublet ground state of an electrostatically-defined quantum dot Josephson junction with large charging energy. Additionally, we use a magnetic field to enable direct spin manipulation over a frequency range of 10 GHz. Using an all-electric microwave drive we achieve Rabi frequencies exceeding 200 MHz. We furthermore embed the Andreev spin qubit in a superconducting transmon qubit, demonstrating strong coherent qubit-qubit coupling. These results are a crucial step towards a hybrid architecture that combines the beneficial aspects of both superconducting and semiconductor qubits.

Biography of Marta Pita-Vidal:
Marta Pita-Vidal received two bachelor’s degrees in Mathematics and Physics Engineering from the Polytechnic University of Catalonia (2012) and a MSc in Applied Physics from the Delft University of Technology (2019). Since 2019, she has been a PhD candidate in Leo Kouwenhoven’s group at QuTech.
Marta’s research lies at the interface between condensed matter physics and quantum technologies. In the past, she investigated two-dimensional materials during her stays at ICFO (Spain) and MIT (USA). Currently, she is focusing on the development of hybrid devices which incorporate a semiconducting nanowire into a superconducting circuit. Such devices provide new insights into mesoscopic physics phenomena at the nanowire and, at the same time, constitute novel types of hybrid qubits.


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