Quantum Science with Alkaline Earth Tweezer Arrays

Manuel Endres

Adam M. Kaufman, Kang-Kuen Ni

A. P. Burgers

Shuo Ma, A. P. Burgers, Genyue Liu +3 more

Neutral atom arrays are a rapidly developing platform for quantum science.Recently, alkaline earth atoms (AEAs) have attracted interest because their unique level structure provides several opportunities for improved performance.In this work, we present the first demonstration of a universal set of quantum gate operations on a nuclear spin qubit in an AEA, using 171 Yb.We implement narrow-line cooling and imaging using a newly discovered magic trapping wavelength at λ ¼ 486.78 nm.We also demonstrate nuclear spin initialization, readout, and single-qubit gates and observe long coherence times [T 1 ≈ 20 s and24ð5Þ s] and a single-qubit operation fidelity F 1Q ¼ 0.99959ð6Þ.We also demonstrate two-qubit entangling gates using the Rydberg blockade, as well as coherent control of these gate operations using light shifts on the Yb þ ion core transition at 369 nm.These results are a significant step toward highly coherent quantum gates in AEA tweezer arrays.

A. P. Burgers

Neutral atoms trapped in arrays of optical tweezers are a versatile platform for multiple research efforts in quantum information science. In particular, alkaline-earth atoms like Yb offer many advantages including ultralong coherence nuclear spin states for quantum information storage and high-fidelity qubit operations, optical transitions to Rydberg states for generating strong, long-range interactions between atoms, and narrow optical transitions for efficient cooling and metrology. Additionally, optical transitions from the long-lived 3P0 nuclear spin state have frequencies in the telecommunications band making integration with fiber networks and silicon nanophotonics an attractive avenue of exploration for hybrid quantum systems and quantum communication. Finally, these optical tweezer platforms are well suited for investigating the cooperative response of an array of atoms, where the proximity of neighboring atoms fundamentally alters the systems optical response which has implications for quantum information storage. Here I will present efforts to investigate these research avenues using alkaline-earth atoms in optical tweezers.

Alexandre Cooper, Jacob P. Covey, Ivaylo S. Madjarov +3 more

New experiments demonstrate the ability to image and cool individual strontium atoms in an array of optical tweezers, paving the way to controlled manipulation of alkaline-earth atoms in a wide variety of applications.