Single Nuclear Spin Cavity QED

TL;DR

This paper demonstrates a cavity QED system with a single nuclear spin of 171Yb, enabling fast, projective measurements crucial for scalable quantum computing, with simplified procedures due to the atom's unique properties.

Contribution

The work introduces a cavity QED setup with 171Yb's nuclear spin, achieving rapid projective measurements and simplified spin state verification.

Findings

Measurement time of 30 microseconds achieved.

Systematic error in state determination is below 2%.

Enhanced photon emission rate facilitates efficient projective measurement.

Abstract

We constructed a cavity QED system with a diamagnetic atom of 171Yb and performed projective measurements on a single nuclear spin. Since Yb has no electronic spin and has 1/2 nuclear spin, the procedure of spin polarization and state verification can be dramatically simplified compared with the pseudo spin-1/2 system. By enhancing the photon emission rate of the 1S0-3P1 transition, projective measurement is implemented for an atom with the measurement time of T_meas = 30us. Unwanted spin flip as well as dark counts of the detector lead to systematic error when the present technique is applied for the determination of diagonal elements of an unknown spin state, which is delta|beta|^2 < 2 * 10^-2. Fast measurement on a long-lived qubit is key to the realization of large-scale one-way quantum computing.