{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:22:56Z","timestamp":1772252576331,"version":"3.50.1"},"reference-count":30,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2022,1,17]],"date-time":"2022-01-17T00:00:00Z","timestamp":1642377600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>The ability to control the flow of quantum information is deterministically useful for scaling up quantum computation. In this paper, we demonstrate a controllable quantum switchboard which directs the teleportation protocol to one of two targets, fully dependent on the sender\u2019s choice. Importantly, the quantum switchboard also acts as a optimal quantum cloning machine, which allows the receivers to recover the unknown quantum state with a maximal fidelity of 56. This protects the system from the complete loss of quantum information in the event that the teleportation protocol fails. We also provide an experimentally feasible physical implementation of the proposal using a coupled-cavity array. The proposed switchboard can be utilized for the efficient routing of quantum information in a large quantum network.<\/jats:p>","DOI":"10.3390\/e24010136","type":"journal-article","created":{"date-parts":[[2022,1,17]],"date-time":"2022-01-17T20:46:03Z","timestamp":1642452363000},"page":"136","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Quantum Switchboard with Coupled-Cavity Array"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1920-5407","authenticated-orcid":false,"given":"Wai-Keong","family":"Mok","sequence":"first","affiliation":[{"name":"Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0879-0591","authenticated-orcid":false,"given":"Leong-Chuan","family":"Kwek","sequence":"additional","affiliation":[{"name":"Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore"},{"name":"MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, Singapore UMI 3654, Singapore"},{"name":"National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore"},{"name":"Quantum Science and Engineering Center, Nanyang Technological University, Singapore 637616, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1023","DOI":"10.1038\/nature07127","article-title":"The quantum internet","volume":"453","author":"Kimble","year":"2008","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"eaam9288","DOI":"10.1126\/science.aam9288","article-title":"Quantum internet: A vision for the road ahead","volume":"362","author":"Wehner","year":"2018","journal-title":"Science"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1145\/1039111.1039118","article-title":"Infrastructure for the quantum Internet","volume":"34","author":"Lloyd","year":"2004","journal-title":"ACM SIGCOMM Comput. 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