Universal Control of Ion Qubits in a Scalable Microfabricated Planar Trap

TL;DR

This paper demonstrates universal quantum control over ion chains in a scalable surface-electrode trap, achieving high-fidelity single- and two-qubit gates, and implementing fundamental quantum algorithms in a one-dimensional architecture.

Contribution

It presents the first implementation of universal control over ion chains in a scalable microfabricated trap, including high-fidelity gates and entanglement generation.

Findings

Single-qubit gate fidelity up to 0.970

Bell state fidelity up to 0.84

CNOT gate fidelity of 0.76

Abstract

We demonstrate universal quantum control over chains of ions in a surface-electrode ion trap, including all the fundamental operations necessary to perform algorithms in a one-dimensional, nearest-neighbor quantum computing architecture. We realize both single-qubit operations and nearest-neighbor entangling gates with Raman laser beams, and we interleave the two gate types. We report average single-qubit gate fidelities as high as 0.970(1) for two-, three-, and four-ion chains, characterized with randomized benchmarking. We generate Bell states between the nearest-neighbor pairs of a three-ion chain, with fidelity up to 0.84(2). We combine one- and two-qubit gates to perform quantum process tomography of a CNOT gate in a two-ion chain, and we report an overall fidelity of 0.76(3).