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SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 50: Materials and devices for quantum technology III

HL 50.7: Talk

Friday, March 31, 2023, 11:30–11:45, JAN 0027

Optimal quantum control of Si/SiGe spin qubits in a Quantum bus architecture — •Akshay Menon Pazhedath1, Alessandro David1, Lars R. Schreiber2, Hendrik Bluhm2, Tommaso Calarco1, and Felix Motzoi11Peter Grünberg Institute-Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — 2JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

Quantum bus architecture based on electron spin-shuttling is a promising candidate for scalable quantum computing, as the number of control lines required to control the spin remains constant irrespective of the length of the device. A gated Si/SiGe quantum well with a carefully placed micro-magnet acts as an addressable qubit system in such an architecture. We investigate the feasibility of performing single qubit operations using optimal quantum control techniques. Spin decoherence due to interaction with the valley degree of freedom in the Si/SiGe heterostructure is identified as a potential decay mechanism and optimal pulses are engineered to maximize single qubit state transfer and unitary operation fidelities, so that the operations are compliant with the fault tolerant error threshold.

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