Quantum State Engineering using Single Nuclear Spin Qubit of Optically Manipulated Ytterbium Atom

TL;DR

This paper demonstrates precise nuclear spin control of a single ytterbium atom in an optical cavity, achieving high fidelity and purity, with potential applications in scalable quantum computing.

Contribution

It introduces a novel method for nuclear spin manipulation using cavity QED and NMR, maintaining long coherence times for quantum information processing.

Findings

Quantum state control fidelity > 0.98

Purity > 0.96 confirmed by state tomography

Long coherence times (T1=0.49s, T2=0.10s) maintained

Abstract

A single Yb atom is loaded into a high-finesse optical cavity with a moving lattice, and its nuclear spin state is manipulated using a nuclear magnetic resonance technique. A highly reliable quantum state control with fidelity and purity greater than 0.98 and 0.96, respectively, is confirmed by the full quantum state tomography; a projective measurement with high speed (500us) and high efficiency (0.98) is accomplished using the cavity QED technique. Because a hyperfine coupling is induced only when the projective measurement is operational, the long coherence times (T_1 = 0.49 s and T_2 = 0.10 s) are maintained. Our technique can be applied for implementing a scalable one-way quantum computation with a cluster state in an optical lattice.