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DTSTAMP:20260424T143454Z
UID:1748863800@ist.ac.at
DTSTART:20250602T133000
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DESCRIPTION:Speaker: Jaime Saez Mollejo\nhosted by Sylvia Cremer\nAbstract:
  Over the past century\, researchers have been fascinated by the quantum n
 ature of the world\, initially striving to understand its fundamental prin
 ciples and consequences\, and eventually progressing toward engineering sy
 stems in which quantum properties can be controlled and manipulated. Today
 \, we stand at the dawn of the quantum technology era. While some quantum 
 technologies follow well-defined roadmaps\, others are still in the exciti
 ng and uncertain early stages of development. In the fields of quantum com
 puting and quantum simulation\, research is being conducted across a wide 
 variety of platforms. Each of these demonstrates control over quantum prop
 erties but also faces challenges in scaling up to the level of a mature te
 chnology.This thesis explores some of the fundamental properties of hole s
 pin qubits in planar germanium. Semiconductor spin qubits are considered s
 trong candidates for the realization of quantum processors\, owing to thei
 r long relaxation and coherence times\, as well as their compatibility wit
 h existing semiconductor industry infrastructure. Among these\, hole spin 
 qubits in planar germanium are particularly promising. Their advantages in
 clude a large effective mass\, which eases fabrication constraints\; inher
 ent protection from hyperfine noise\; and strong spin-orbit interaction\, 
 which enables fast and purely electrical control. However\, spin-orbit cou
 pling also introduces site-dependent variability across qubits\, particula
 rly in the g-tensors and spin-flip tunneling\, which might cause that the 
 quantization axes are not aligned. In this thesis\, we investigate the til
 t between the quantization axes of two hole spins hosted in a double quant
 um dot as a function of both the magnetic field direction and various elec
 trostatic configurations\, demonstrating that both parameters influence th
 is tilt. We conclude by introducing a machine-learning-assisted routine to
  automatically tune baseband spin qubits. This approach may prove to be a 
 powerful tool for characterizing spin-orbit effects and gaining deeper ins
 ight into the physics governing spin qubit behavior.
LOCATION:Sunstone Bldg / Ground floor / Big Seminar Room B (I23.EG.102)\, I
 STA
ORGANIZER:
SUMMARY:Jaime Saez Mollejo: Thesis Defense: Singlet-Triplet Qubits in Plana
 r Germanium: From Exchange Anisotropies to Autonomous Tuning
URL:https://talks-calendar.ista.ac.at/events/5813
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