{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T20:32:49Z","timestamp":1777494769657,"version":"3.51.4"},"reference-count":77,"publisher":"Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften","license":[{"start":{"date-parts":[[2020,3,2]],"date-time":"2020-03-02T00:00:00Z","timestamp":1583107200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Quantum"],"abstract":"<jats:p>When two equal photon-number states are combined on a balanced beam splitter, both output ports of the beam splitter contain only even numbers of photons. Consider the time-reversal of this interference phenomenon: the probability that a pair of photon-number-resolving detectors at the output ports of a beam splitter both detect the same number of photons depends on the overlap between the input state of the beam splitter and a state containing only even photon numbers. Here, we propose using this even-parity detection to engineer quantum states containing only even photon-number terms. As an example, we demonstrate the ability to prepare superpositions of two coherent states with opposite amplitudes, i.e. two-component Schr\u00f6dinger cat states. Our scheme can prepare cat states of arbitrary size with nearly perfect fidelity. Moreover, we investigate engineering more complex even-parity states such as four-component cat states by iteratively applying our even-parity detector.<\/jats:p>","DOI":"10.22331\/q-2020-03-02-239","type":"journal-article","created":{"date-parts":[[2020,3,2]],"date-time":"2020-03-02T09:50:59Z","timestamp":1583142659000},"page":"239","source":"Crossref","is-referenced-by-count":41,"title":["Engineering Schr\u00f6dinger cat states with a photonic even-parity detector"],"prefix":"10.22331","volume":"4","author":[{"given":"G. S.","family":"Thekkadath","sequence":"first","affiliation":[{"name":"Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B. A.","family":"Bell","sequence":"additional","affiliation":[{"name":"Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"I. A.","family":"Walmsley","sequence":"additional","affiliation":[{"name":"Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A. I.","family":"Lvovsky","sequence":"additional","affiliation":[{"name":"Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK"},{"name":"Russian Quantum Center, 100 Novaya St., Skolkovo, Moscow 143025, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"9598","published-online":{"date-parts":[[2020,3,2]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"A. I. Lvovsky, Photonics: Scientific Foundations, Technology and Applications 1, 121 (2015).","DOI":"10.1002\/9781119009719.ch5"},{"key":"1","doi-asserted-by":"publisher","unstructured":"C. Weedbrook, S. Pirandola, R. Garc\u00eda-Patr\u00f3n, N. J. Cerf, T. C. Ralph, J. H. Shapiro, and S. Lloyd, Rev. Mod. 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