Implementation of an Ytterbium 171 Trapped Ion Qubit

Steven Olmschenk, Dzmitry Matsukevich, Peter Maunz +3 more

Naleli Jubert Matjelo, Nancy Payne, Charles Rigby +1 more

This paper presents a proof-of-concept for manipulation of Ytterbium 171 trapped-ion qubits through the Rabiflops experiment.This serves as a partial report on an ongoing project aimed at developing a fully operational ion trapping and quantum feedback control laboratory at Stellenbosch University.Despite the bad vacuum conditions during the Rabi-flops experiment, we were able to manipulate the trapped Ytterbium 171 ion qubits with microwave pulses to give out a clear indication of Rabi oscillations.A high rate of ion loss led to the Rabi oscillations profile showing a decay feature within it.This decay feature was modeled and characterized, hence showing that we were losing ions at the rate defined by a time constant of 𝜏 = 4500 -1 seconds.

Christopher J. Ballance

Gavin Nop, Durga Paudyal, Jonathan D. H. Smith

We present an overview of contemporary quantum computing with ytterbium ion traps, placing the emphasis on industry implementations. We provide brief, concrete descriptions of various key features, such as trap loading, electronic structure, qubit function, gates, error analysis, and benchmarking. We focus on the underlying science and current technologies to provide readers with a holistic picture of available techniques for using ytterbium in contemporary ion trap designs.

B. B. Blinov, Dietrich G. Leibfried, Christopher R. Monroe +1 more

Arjun D. Rao

The technology of linear ion traps are constantly innovating with increasingly varying atomic species being trapped in more scalable systems. In some iterations, multiple species can be confined, offering advanced computing capabilities such as sympathetic cooling. As the ion chains grow in size, the ion operations must scale with it, permitting universal quantum computation in larger qubit arrays. In this thesis, the design, construction and preliminary characterisation of a dual-species trapped-ion system is described. Additionally, an investigation into how entangling gates operate in these systems is performed. Laser setups at 355nm drive the spin-motion coupling in ytterbium ions to produce entanglement at high fidelities in longer chains. First, entangling gates are implemented in the ytterbium trapwith improvements to the control software. Primitive Mølmer-Sørensen gates are introducedand phase modulated gates using Q-CTRL’s graph based optimiser are implemented. Second, entanglement is computationally investigated in multipartite systems. Comparisons aredrawn between quantum control techniques such as laser modulation and Rabi rate imbalances are investigated.