Barium ions are trapped and Doppler cooled in a linear Paul trap with the goal of demonstrating state initialization, single-qubit operations and detection. Rabi rotations are demonstrated on the 6S1/2 ↔ 6P3/2 transition using single pulses from a mode-locked Ti:Sapphire laser, and some evidence for the same on the more useful 6S1/2] ↔ 6P1/2 transition is shown. With the goal of entangling the polarization mode of emitted photons with the spin state of the ion in the trap in mind, single photon generation and detection ability is demonstrated. A stabilized 1.762 µm laser is used on the 6S1/2 → 5D5/2 transition to demonstrate the ability to state selectively shelve the ion from the ground state to be used as readout. Using the techniques that will enable qubit operations and readout, several quantities of interest in 137Ba+ are measured either for the first time or to higher accuracy than previously achieved.Barium ions are trapped and Doppler cooled in a linear Paul trap with the goal of demonstrating state initialization, single-qubit operations and detection. Rabi rotations are demonstrated on the 6S1/2 ↔ 6P3/2 transition using single pulses from a mode-locked Ti:Sapphire laser, and some evidence for the same on the more useful 6S1/2] ↔ 6P1/2 transition is shown. With the goal of entangling the polarization mode of emitted photons with the spin state of the ion in the trap in mind, single photon generation and detection ability is demonstrated. A stabilized 1.762 µm laser is used on the 6S1/2 → 5D5/2 transition to demonstrate the ability to state selectively shelve the ion from the ground state to be used as readout. Using the techniques that will enable qubit operations and readout, several quantities of interest in 137Ba+ are measured either for the first time or to higher accuracy than previously achieved.

Jan 1, 20100 citations

Adiabatic passage in the presence of noise

T. Noel, Matthew Dietrich, Nathan Kurz +3 more

We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented on the transition from the $6{S}_{1/2}$ ground state to the metastable $5{D}_{5/2}$ level by applying a laser at 1.76 $\ensuremath{\mu}$m. We focus on the interplay of laser frequency noise and laser power in shaping the effectiveness of RAP, which is commonly assumed to be a robust tool for high-efficiency population transfer. However, we note that reaching high state transfer fidelity requires a combination of small laser linewidth and large Rabi frequency.We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented on the transition from the $6{S}_{1/2}$ ground state to the metastable $5{D}_{5/2}$ level by applying a laser at 1.76 $\ensuremath{\mu}$m. We focus on the interplay of laser frequency noise and laser power in shaping the effectiveness of RAP, which is commonly assumed to be a robust tool for high-efficiency population transfer. However, we note that reaching high state transfer fidelity requires a combination of small laser linewidth and large Rabi frequency.

arXiv:1108.2671Physical Review AFeb 1, 201224 citations

An integrated laser system for manipulating trapped ions qubits

Weiran Ye, Jin‐Ming Cui, Yan Chen +5 more

Optics & Laser TechnologyMar 7, 20251 citation

We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented on the transition from the

6{S}_{1/2}

ground state to the metastable

5{D}_{5/2}

level by applying a laser at 1.76 $\ensuremath{\mu}$m. We focus on the interplay of laser frequency noise and laser power in shaping the effectiveness of RAP, which is commonly assumed to be a robust tool for high-efficiency population transfer. However, we note that reaching high state transfer fidelity requires a combination of small laser linewidth and large Rabi frequency.