High-Fidelity Laser-Free Trapped-Ion Entangling Gates with an RF Oscillating Magnetic Field Gradient
Abstract
Trapped-ion entangling gates typically rely on laser-induced coupling of the ions' internal qubit states to their motion. Laser-free entangling gates, which eliminate photon scattering errors and may offer benefits for scalability, have been implemented using either static magnetic field gradients or magnetic field gradients oscillating at GHz frequencies. We demonstrate a recently proposed trapped-ion entangling gate based on a radiofrequency oscillating magnetic field gradient and two microwave magnetic fields symmetrically detuned about the qubit frequency. Our implementation offers reduced sensitivity to qubit and motional frequency errors, enabling the generation of a symmetric Bell state of two 25Mg+ hyperfine qubits with fidelity 0 . 998(2) in 700 μs. This gate scheme also allows us to incorporate laser-free single-ion addressing to prepare an antisymmetric Bell state.
This work was supported by ONR and the NIST Quantum Information Program.- Publication:
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APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DMPH06002K