Abstract
Understanding and mitigating decoherence is a key challenge for quantum
science and technology. The main source of decoherence for solid-state spin
systems such as quantum dots, donors in silicon and defects in diamond is the
uncontrolled spin bath environment. Here, we demonstrate quantum control of a
mesoscopic electron spin bath in diamond at room temperature. The resulting
spin bath dynamics are probed using a single nitrogen-vacancy (NV) centre
electron spin as a magnetic field sensor. We exploit the spin bath control to
dynamically suppress dephasing of the NV spin by the spin bath. Furthermore,
using ideas from dynamical decoupling, we directly measure the coherence and
temporal correlations of different groups of bath spins. These results uncover
a new arena for decoherence studies and may provide novel avenues for
protecting the coherence of solid-state spin qubits. Moreover, spin bath
control is a crucial ingredient of recent proposals for environment-assisted
magnetometry, room-temperature quantum computing using spins in diamond and
spin squeezing.
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