Transport-enabled entangling gate for trapped ions

Abstract

We implement a two-qubit entangling Mølmer-Sørensen interaction by transporting two co-trapped ${}^{40}{\mathrm{Ca}}^{+}$ ions through a stationary, bichromatic optical beam within a surface-electrode Paul trap. We describe a procedure for achieving a constant Doppler shift during the transport which uses fine temporal adjustment of the moving confinement potential. The fixed interaction duration of the ions transported through the laser beam as well as the dynamically changing ac Stark shift require alterations to the calibration procedures used for a stationary gate. We use the interaction to produce Bell states with fidelities commensurate to those of stationary gates performed in the same system. This result establishes the feasibility of actively incorporating ion transport into quantum information entangling operations.

5 pages, 3 figures

References in corpus (8)

• Towards fault-tolerant quantum computing with trapped ions
• High-Fidelity Bell-State Preparation with ${}^{40}$Ca${}^{+}$ Optical Qubits
• Deterministic entanglement of ions in thermal states of motion
• Controlling trapping potentials and stray electric fields in a microfabricated ion trap through design and compensation
• Experimental realization of fast ion separation in segmented Paul traps
• Transport quantum logic gates for trapped ions
• Deterministic reordering of 40Ca+ ions in a linear segmented Paul trap
• Quantum process tomography of a Mølmer-Sørensen gate via a global beam

Cited by in corpus (3)

• High-fidelity trapped-ion qubit operations with scalable photonic modulators
• Characterization of Fast Ion Transport via Position-Dependent Optical Deshelving
• Comparison of Spontaneous Emission in Trapped Ion Multiqubit Gates at High Magnetic Fields