Kavli Affiliate: Ke Wang
| First 5 Authors: Ke Wang, Gang Xu, Fei Gao, He Liu, Rong-Long Ma
| Summary:
Operation speed and coherence time are two core measures for the viability of
a qubit. Strong spin-orbit interaction (SOI) and relatively weak hyperfine
interaction make holes in germanium (Ge) intriguing candidates for spin qubits
with rapid, all-electrical coherent control. Here we report ultrafast
single-spin manipulation in a hole-based double quantum dot in a germanium hut
wire (GHW). Mediated by the strong SOI, a Rabi frequency exceeding 540 MHz is
observed at a magnetic field of 100 mT, setting a record for ultrafast spin
qubit control in semiconductor systems. We demonstrate that the strong SOI of
heavy holes (HHs) in our GHW, characterized by a very short spin-orbit length
of 1.5 nm, enables the rapid gate operations we accomplish. Our results
demonstrate the potential of ultrafast coherent control of hole spin qubits to
meet the requirement of DiVincenzo’s criteria for a scalable quantum
information processor.
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