State-selective EIT for quantum error correction in neutral atom quantum computers

TL;DR

This paper introduces a state-selective EIT-based measurement technique for neutral atom quantum computers, enabling non-destructive, site-specific qubit state detection crucial for quantum error correction.

Contribution

It presents a novel method combining site-selective transfer and EIT to measure qubit states without disturbing unmeasured atoms, advancing quantum error correction capabilities.

Findings

Demonstrates a protocol for non-destructive, site-selective qubit measurement.

Shows how EIT can protect unmeasured atoms during detection.

Enables recooling and reinitialization of atoms post-measurement.

Abstract

We propose a way to measure the qubit state of an arbitrary sub-ensemble of atoms in an array without significantly disturbing the quantum information in the unmeasured atoms. The idea is to first site-selectively transfer atoms out of the qubit basis so that one of the two states at a time is put into an auxiliary state. Electromagnetically induced transparency (EIT) light will then protect most states while detection light is scattered from atoms in the auxiliary state, which is made immune to the EIT protection by angular momentum selection rules and carefully chosen light polarization. The two states will be measured in turn, after which it is possible to recool and return the atoms to a qubit state. These measurements can be the basis of quantum error correction.