Work

Protocol for purifying noisy preparation and measurements of qubits

Year: 2026

Type: article

Abstract: Noise affecting qubit preparation and measurements accounts for a significant fraction of errors in quantum information processing. This is especially critical in tasks like variational quantum algorithms, quantum error correction, and entanglement distribution through repeaters. In this work, we present a protocol to purify noisy state preparation and measurement (SPAM), effectively suppressing these errors to an arbitrarily low level. For instance, in a realistic scenario where qubits contain error rates around 0.05 in both preparation and measurement, the protocol can suppress error rates up to 10 − 3 with two ancillas and 10 − 6 with four ancillas. We show how to distill error-free SPAM by repeating noisy SPAMs. The protocol is also feasible with superconducting qubits. We envisage that our results can be used to realize quantum information tasks in computing and communication with negligible SPAM errors.

Source: Physical Review Research

DOI: 10.1103/z6pg-m3q6

Authors: Jaemin Kim, Seungchan Seo, Jiyoung Yun, Benjamin Lienhard, Joonwoo Bae

Institutions: Korea Advanced Institute of Science and Technology, Aalborg University, Bavarian Academy of Sciences and Humanities, Technical University of Munich

Language: English

Topic: Quantum Computing Algorithms and Architecture

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625