Projective measurement of a single nuclear spin qubit by using two-mode cavity QED

TL;DR

This paper demonstrates a method for measuring a single nuclear spin qubit using a two-mode cavity QED system that links nuclear spin states to photon polarization, enabling projective measurement.

Contribution

It introduces a novel two-mode cavity QED setup that couples nuclear spin states to photon polarization for projective measurement of a single nuclear spin.

Findings

Successfully measured a single 171Yb nuclear spin via cavity-enhanced fluorescence.

Established a system linking nuclear spin states to photon polarization.

Facilitates development of hybrid quantum systems.

Abstract

We report the implementation of projective measurement on a single 1/2 nuclear spin of the 171Yb atom by measuring the polarization of cavity-enhanced fluorescence. To obtain cavity-enhanced fluorescence having a nuclear-spin-dependent polarization, we construct a two-mode cavity QED system, in which two cyclic transitions are independently coupled to each of the orthogonally polarized cavity modes, by manipulating the energy level of 171Yb. This system can associate the nuclear spin degrees of freedom with the polarization of photons, which will facilitate the development of hybrid quantum systems.