Individual-Ion Addressing and Readout in a Penning Trap

Abstract

We implement individual addressing and readout of ions in a rigidly rotating planar crystal in a compact, permanent magnet Penning trap. The crystal of ${}^{40}$Ca${}^{+}$ is trapped and stabilized without defects via a rotating triangular potential. The trapped ion fluorescence is detected in the rotating frame for parallel readout. The qubit is encoded in the metastable D${}_{5/2}$ manifold enabling the use of high-power near-infrared laser systems for qubit operations. Addressed ${\sigma }_z$ operations are realized with a focused AC Stark shifting laser beam. We demonstrate addressing of ions near the center of the crystal and at large radii. Simulations show that the current addressing operation fidelity is limited to $\sim 97\%$ by the ion's thermal extent for the in-plane modes near the Doppler limit, but this could be improved to infidelities $<10^{-3}$ with sub-Doppler cooling. The techniques demonstrated in this paper complete the set of operations for quantum simulation with the platform.

5 pages, 6 figures

References in corpus (7)

• Demonstration of multi-qubit entanglement and algorithms on a programmable neutral atom quantum computer
• Exploring Large-Scale Entanglement in Quantum Simulation
• Controlling two-dimensional Coulomb crystals of more than 100 ions in a monolithic radio-frequency trap
• Controlling long ion strings for quantum simulation and precision measurements
• Equilibration of the planar modes of ultracold two dimensional ion crystals in a Penning trap
• Efficient site-resolved imaging and spin-state detection in dynamic two-dimensional ion crystals
• Rapid cooling of the in-plane motion of two-dimensional ion crystals in a Penning trap to millikelvin temperatures

Cited by in corpus (4)

• Volcano Architecture for Scalable Quantum Processor Units
• Adiabatic Cooling of Planar Motion in a Penning Trap Ion Crystal to Sub-Millikelvin Temperatures
• Efficient Three-Dimensional Sub-Doppler Cooling of ${}^{40}$Ca${}^{+}$ in a Penning Trap
• Exact quantification of bipartite entanglement in unresolvable spin ensembles