A Novel, Robust Quantum Detection Scheme

TL;DR

This paper introduces a new quantum detection method using correlations and spin-flip techniques with a single ion, demonstrating increased robustness and reduced systematic errors over traditional methods.

Contribution

The novel detection scheme enhances robustness against laser power fluctuations and overcomes systematic errors in quantum state discrimination.

Findings

More robust against detection laser power fluctuations

Overcomes systematic detection errors

Improves Rabi oscillation contrast

Abstract

Protocols used in quantum information and precision spectroscopy rely on efficient internal quantum state discrimination. With a single ion in a linear Paul trap, we implement a novel detection method which utilizes correlations between two detection events with an intermediate spin-flip. The technique is experimentally characterized as more robust against fluctuations in detection laser power compared to conventionally implemented methods. Furthermore, systematic detection errors which limit the Rabi oscillation contrast in conventional methods are overcome.