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DTSTART:20200329T030000
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DTSTART:20191027T020000
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DTSTAMP:20260405T083607Z
UID:5c5c38a48b7ef373148290@ist.ac.at
DTSTART:20191217T110000
DTEND:20191217T120000
DESCRIPTION:Speaker: Floris Braakman\nhosted by Georgios Katsaros\nAbstract
 : The spin state of single holes in Ge- and Si-based one-dimensional nanos
 tructures can be used to encode a qubit with unique functionality. Such ho
 le spin qubits potentially combine all-electrical control\, ultrahigh cloc
 k speeds and small device sizes\, promising a level of control that goes b
 eyond that of conventional electron spin qubits. In particular\, the spin-
 orbit interaction of holes in Ge/Si core-shell nanowires is predicted to b
 e both very strong and electric field tunable. Such electrical tunability 
 would enable to switch spin-orbit interaction either on\, enabling fast qu
 antum operations\, or off\, leading to improved coherence times. In recent
  experiments\, we have demonstrated the presence of this strong spin-orbit
  interaction and have used it to show record spin qubit Rabi frequencies e
 xceeding 400 MHz and entering the regime of strong driving. Furthermore\, 
 we find the Rabi oscillation frequency as well as the g-factor to be highl
 y tunable through small changes in gate voltages\, indicating electrical c
 ontrol over the spin-orbit interaction strength. These measurements demons
 trate the viability of hole spin qubits in one-dimensional Ge- and Si-base
 d nanodevices as a platform for the implementation of fast and scalable qu
 antum computation.
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Floris Braakman: Ultrafast and electrically tunable coherent operat
 ions of hole spin qubits
URL:https://talks-calendar.ista.ac.at/events/2383
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