https://doi.org/10.1140/epjs/s11734-025-01715-8
Regular Article
Quantum state compression shadow
Henan Key Laboratory of Quantum Information and Cryptography, 450000, Zhengzhou, Henan, China
Received:
28
April
2025
Accepted:
26
May
2025
Published online:
9
June
2025
Quantum state readout serves as the cornerstone of quantum information processing, exerting profound influence on quantum communication, computation, and metrology. In this study, we introduce a readout architecture called Compression Shadow (CompShadow), which transforms the conventional readout paradigm by compressing multi-qubit states into single-qubit shadows before measurement. Compared to direct measurements of the initial quantum states, CompShadow achieves comparable accuracy in amplitude and observable expectation estimation while consuming similar measurement resources. Furthermore, its implementation on near-term quantum hardware with nearest-neighbor coupling architectures is straightforward. Significantly, CompShadow brings forth novel features, including the complete suppression of correlated readout noise, fundamentally reducing the quantum hardware demands for readout. It also facilitates the exploration of multi-body system properties through single-qubit probes and opens the door to designing quantum communication protocols with exponential loss suppression. Our findings mark the emergence of a new era in quantum state readout, setting the stage for a revolutionary leap in quantum information processing capabilities.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjs/s11734-025-01715-8.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
