{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,3,29]],"date-time":"2022-03-29T17:00:15Z","timestamp":1648573215339},"reference-count":6,"publisher":"World Scientific Pub Co Pte Lt","issue":"02","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Open Syst. Inf. Dyn."],"published-print":{"date-parts":[[2007,6]]},"abstract":"<jats:p> We compare two physical systems: polarization degrees of freedom of a macroscopic light beam and the Josephson junction (JJ) in the \u201ccharge qubit regime\u201d. The first system obviously cannot carry genuine quantum information and we show that the maximal entanglement which could be encoded into polarization of two light beams scales like 1\/(photon number). Two theories of JJ, one leading to the picture of \u201cJJ-qubit\u201d and the other based on the mean-field approach are discussed. The later, which seems to be more appropriate, implies that the JJ system is, essentially, mathematically equivalent to the polarization of a light beam with the number of photons replaced by the number of Cooper pairs. The existing experiments consistent with the \u201cJJ-qubit\u201d picture and the theoretical arguments supporting, on the contrary, the classical model are briefly discussed. The Franck-Hertz-type experiment is suggested as an ultimate test of the JJ nature. <\/jats:p>","DOI":"10.1007\/s11080-007-9039-1","type":"journal-article","created":{"date-parts":[[2007,5,30]],"date-time":"2007-05-30T10:58:19Z","timestamp":1180522699000},"page":"223-228","source":"Crossref","is-referenced-by-count":2,"title":["False Qubits?: Polarization of Light and Josephson Junction"],"prefix":"10.1142","volume":"14","author":[{"given":"Robert","family":"Alicki","sequence":"first","affiliation":[{"name":"Institute of Theoretical Physics and Astrophysics, University of Gda\u0144sk, Wita Stwosza 57, PL 80-952 Gda\u0144sk, Poland"}]}],"member":"219","published-online":{"date-parts":[[2012,4,17]]},"reference":[{"key":"rf1","volume-title":"Polarized Light","author":"Shurcliff W. A.","year":"1964"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.81.3563"},{"key":"rf4","doi-asserted-by":"publisher","DOI":"10.1016\/S0375-9601(96)00706-2"},{"key":"rf6","volume-title":"Handbook of Theoretical and Computational Technology","author":"Wendin G.","year":"2005"},{"key":"rf7","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.79.4950"},{"key":"rf9","volume-title":"Studies in Statistical Mechanics","volume":"1","author":"Bogoliubov N. N.","year":"1962"}],"container-title":["Open Systems &amp; Information Dynamics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.worldscientific.com\/doi\/pdf\/10.1007\/s11080-007-9039-1","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,8,6]],"date-time":"2019-08-06T19:58:18Z","timestamp":1565121498000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.worldscientific.com\/doi\/abs\/10.1007\/s11080-007-9039-1"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2007,6]]},"references-count":6,"journal-issue":{"issue":"02","published-online":{"date-parts":[[2012,4,17]]},"published-print":{"date-parts":[[2007,6]]}},"alternative-id":["10.1007\/s11080-007-9039-1"],"URL":"https:\/\/doi.org\/10.1007\/s11080-007-9039-1","relation":{},"ISSN":["1230-1612","1793-7191"],"issn-type":[{"value":"1230-1612","type":"print"},{"value":"1793-7191","type":"electronic"}],"subject":[],"published":{"date-parts":[[2007,6]]}}}