Tuning the coherent interaction of an electron qubit and a nuclear magnon
arxiv(2024)
摘要
A central spin qubit interacting coherently with an ensemble of proximal
spins can be used to engineer entangled collective states or a multi-qubit
register. Making full use of this many-body platform requires tuning the
interaction between the central spin and its spin register. GaAs quantum dots
offer a model realization of the central spin system where an electron qubit
interacts with multiple ensembles of ∼ 10^4 nuclear spins. In this work,
we demonstrate tuning of the interaction between the electron qubit and the
nuclear many-body system in a GaAs quantum dot. The homogeneity of the GaAs
system allows us to perform high-precision and isotopically selective nuclear
sideband spectroscopy, which reveals the single-nucleus electronic Knight
field. Together with time-resolved spectroscopy of the nuclear field, this
fully characterizes the electron-nuclear interaction for a priori control. An
algorithmic feedback sequence selects the nuclear polarization precisely, which
adjusts the electron-nuclear exchange interaction in situ via the electronic
g-factor anisotropy. This allows us to tune directly the activation rate of a
collective nuclear excitation (magnon) and the coherence time of the electron
qubit. Our method is applicable to similar central-spin systems and enables the
programmable tuning of coherent interactions in the many-body regime.
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