High-Fidelity Entangling Gates for Electron and Nuclear Spin Qubits in Diamond
arxiv(2024)
摘要
Motivated by the recent experimental progress in exploring the use of a
nitrogen-vacancy (NV) center in diamond as a quantum computing platform, we
propose schemes for fast and high-fidelity entangling gates on this platform.
Using both analytical and numerical calculations, we demonstrate that
synchronization effects between resonant and off-resonant transitions may be
exploited such that spin-flip errors due to strong driving may be eliminated by
adjusting the gate time or the driving field. This allows for fast, high
fidelity entangling operations between the electron spin and one or several
nuclear spins. We investigate a two-qubit system where the NV center is
comprised of a ^15N atom and a qubit-qutrit system for the case of a
^14N atom. In both cases, we predict a complete suppression of off-resonant
driving errors for two-qubit gates when addressing the NV electron spin
conditioned on states of nuclear spins of the nitrogen atom of the defect.
Additionally, we predict fidelities >0.99 for multi-qubit gates when
including the surrounding ^13C atoms in the diamond lattice in the
conditioned logic.
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