Experimental implementation of leakage elimination operators

TL;DR

This paper reports the first experimental implementation of Leakage Elimination Operators (LEOs) on IBM's quantum computer, demonstrating significant suppression of leakage errors in multi-qubit systems to improve quantum computing reliability.

Contribution

The paper introduces and experimentally demonstrates the effectiveness of LEOs in reducing leakage errors in quantum systems, a novel step towards more reliable quantum computing.

Findings

LEOs significantly suppress leakage errors

Experimental validation on IBM quantum hardware

Applicable to multi-qubit Hilbert spaces

Abstract

Decoherence-induced leakage errors can potentially damage physical or logical qubits by coupling them to other system levels. Here we report the first experimental implementation of Leakage Elimination Operators (LEOs) that aims to reduce this undermining, and that can be applied alongside universal quantum computing. Using IBM's cloud quantum computer, we have studied three potentially applicable examples of subspaces in two- and three-qubit Hilbert spaces and found that the LEOs significantly suppress leakage.