Physical Review A

State-selective electromagnetically induced transparency for quantum error correction in neutral atom quantum computers

Felipe Giraldo, Aishwarya Kumar, Tsung-Yao Wu, Peng Du, David S. Weiss

Published Sep 22, 2022• 5 citations

Abstract

We propose a way to measure the qubit state of an arbitrary subensemble 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.

DOI: 10.1103/physreva.106.032425

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Physical Review A

State-selective electromagnetically induced transparency for quantum error correction in neutral atom quantum computers

Felipe Giraldo, Aishwarya Kumar, Tsung-Yao Wu, Peng Du, David S. Weiss

Published Sep 22, 2022• 5 citations

Publisher

Abstract

DOI: 10.1103/physreva.106.032425

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0.01

. Our numerical simulations in rubidium (Rb) atoms show that for both of these schemes a spatial resolution at the level of tens of nanometers using near-infrared light can be achieved with experimentally realistic parameters.

Mid-circuit qubit measurement and rearrangement in a

^{171}

Yb atomic array

^{171}

Yb atoms to demonstrate nondestructive state-selective and site-selective detection. By applying site-specific light shifts, selected atoms within the array can be hidden from imaging light, which allows a subset of qubits to be measured while causing only percent-level errors on the remaining qubits. As a proof-of-principle demonstration of conditional operations based on the results of the mid-circuit measurements, and of our ability to reuse ancilla qubits, we perform conditional refilling of ancilla sites to correct for occasional atom loss, while maintaining the coherence of data qubits. Looking towards true continuous operation, we demonstrate loading of a magneto-optical trap with a minimal degree of qubit decoherence.