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Loophole-free Bell-inequality violation between atomic states in cavity-QED systems mediated by hybrid atom-light entanglement
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DOI：10.1088/2058-9565/ae5089.png)
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Abstract
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We present a feasible approach to testing Bell nonlocality and implementing device-independent quantum key distribution (DI) between distant atomic states in cavity-based architectures, mediated by hybrid atom-light entanglement. We develop a full theoretical model that incorporates realistic sources of noise-such as transmission loss, limited light-matter coupling efficiency, and imperfect detection. Our analysis shows that strong Bell-Clauser-Horne-Shimony-Holt violations and secure key generation over tens of kilometers are within reach using current or near-term technology. These results position cavity-based platforms with coherent-state encodings as a promising foundation for future DI quantum communication networks.
Keywords:
quantum information
quantum communication
Bell inequality
device-independent quantum key distribution
bosonic codes
cat codes
continuous-variable codes
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