{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T01:09:48Z","timestamp":1760231388534,"version":"build-2065373602"},"reference-count":61,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T00:00:00Z","timestamp":1663545600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Hunan Provincial Natural Science Foundation of China","award":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"],"award-info":[{"award-number":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"]}]},{"name":"Open Fund project of the Key Laboratory of Optoelectronic Control and Detection Technology of University of Hunan Province","award":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"],"award-info":[{"award-number":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"]}]},{"name":"open fund project of the Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education","award":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"],"award-info":[{"award-number":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"]}]},{"name":"Science and Technology Plan Project of Hunan Province","award":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"],"award-info":[{"award-number":["2020JJ4146","2020JJ4002","PC20K02","QSQC1907","2016TP1020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>The cross fusion of quantum mechanics and information science forms quantum information science. Quantum logic gates and quantum entanglement are very important building blocks in quantum information processing. In this paper, we propose one-step schemes for realizing quantum swap gates and generating two-mode entangled coherent states via circuit QED. In our scheme, due to the adiabatic elimination of the excited state of the qutrit under the condition of large detuning, the decoherence of the spontaneous emission of the qutrit can be ignored. The fidelity of the quantum swap gate remains at a very high level. In addition, we also explore the nonclassical properties of two-mode entangled coherent states prepared in our scheme by addressing the second-order correlation function and intermodal squeezing. In particular, two classes of entangled coherent states demonstrate distinct entanglement and nonclassical behavior.<\/jats:p>","DOI":"10.3390\/sym14091951","type":"journal-article","created":{"date-parts":[[2022,9,20]],"date-time":"2022-09-20T04:28:55Z","timestamp":1663648135000},"page":"1951","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Realization of Quantum Swap Gate and Generation of Entangled Coherent States"],"prefix":"10.3390","volume":"14","author":[{"given":"Ziqiu","family":"Zhang","sequence":"first","affiliation":[{"name":"College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xi","family":"Jiang","sequence":"additional","affiliation":[{"name":"College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shiqing","family":"Tang","sequence":"additional","affiliation":[{"name":"College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China"},{"name":"Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"032306","DOI":"10.1103\/PhysRevA.98.032306","article-title":"One-step construction of the multiple-qubit Rydberg controlled-phase gate","volume":"98","author":"Su","year":"2018","journal-title":"Phys. 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