Quantum Darwinism through apparatus-mediated environmental recording
Abstract
Quantum Darwinism explains classical objectivity through redundant environmental records of a system's pointer states. We show that these records can be established through an intermediate measurement apparatus without direct system--environment interactions. Using exact analytical solutions of quantum circuit models, we compare system monitoring with apparatus monitoring, where the environment interacts only with the apparatus. During encoding, system--apparatus correlations decrease as system--environment correlations grow. Without noise, both models yield identical accessible pointer information and redundancy, while the discord accounts for their different mutual information. The reliability of these records depends on where noise acts. Apparatus bit flips introduce errors shared by successive records, limiting the information recoverable even from the complete environment. In contrast, larger fragments can mitigate independent noise on environment qubits after encoding. Dephasing in the pointer basis leaves the record information unchanged in the model considered. These results extend the description of quantum Darwinism to indirect measurements and clarify the conditions for reliable environmental records.
Related
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BibTeX
@misc{don2026quantum,
title = {{Quantum Darwinism through apparatus-mediated environmental recording}},
author = {Tran P. H Don and Lan Nguyen Tran and Le Bin Ho},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.07568},
eprint = {2610.07568},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.07568},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Quantum Darwinism through apparatus-mediated environmental recording
AU - Tran P. H Don
AU - Lan Nguyen Tran
AU - Le Bin Ho
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.07568
UR - https://arxiv.org/abs/2610.07568
AB - Quantum Darwinism explains classical objectivity through redundant environmental records of a system's pointer states. We show that these records can be established through an intermediate measurement apparatus without direct system--environment interactions. Using exact analytical solutions of quantum circuit models, we compare system monitoring with apparatus monitoring, where the environment interacts only with the apparatus. During encoding, system--apparatus correlations decrease as system--environment correlations grow. Without noise, both models yield identical accessible pointer information and redundancy, while the discord accounts for their different mutual information. The reliability of these records depends on where noise acts. Apparatus bit flips introduce errors shared by successive records, limiting the information recoverable even from the complete environment. In contrast, larger fragments can mitigate independent noise on environment qubits after encoding. Dephasing in the pointer basis leaves the record information unchanged in the model considered. These results extend the description of quantum Darwinism to indirect measurements and clarify the conditions for reliable environmental records.
ER -