{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T08:07:30Z","timestamp":1778659650833,"version":"3.51.4"},"reference-count":46,"publisher":"Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften","license":[{"start":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T00:00:00Z","timestamp":1778630400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["quantum-journal.org"],"crossmark-restriction":false},"short-container-title":["Quantum"],"abstract":"\n This work considers a teleportation task for Alice and Bob in a scenario where Bob cannot perform corrections. In particular, we analyse the task of\n \n \n multicopy state teleportation<\/mml:mtext>\n <\/mml:mrow>\n <\/mml:math>\n , where Alice has\n \n k<\/mml:mi>\n <\/mml:math>\n identical copies of an arbitrary unknown\n \n d<\/mml:mi>\n <\/mml:math>\n -dimensional qudit state\n \n |<\/mml:mo>\n &#x03C8;<\/mml:mi>\n &#x27E9;<\/mml:mo>\n <\/mml:math>\n to teleport a single copy of\n \n |<\/mml:mo>\n &#x03C8;<\/mml:mi>\n &#x27E9;<\/mml:mo>\n <\/mml:math>\n to Bob using a maximally entangled two-qudit state shared between Alice and Bob without Bob's correction. Alice may perform a joint measurement on her half of the entangled state and the\n \n k<\/mml:mi>\n <\/mml:math>\n copies of\n \n |<\/mml:mo>\n &#x03C8;<\/mml:mi>\n &#x27E9;<\/mml:mo>\n <\/mml:math>\n . We prove that the maximal probability of success for teleporting the exact state\n \n |<\/mml:mo>\n &#x03C8;<\/mml:mi>\n &#x27E9;<\/mml:mo>\n <\/mml:math>\n to Bob is\n \n p<\/mml:mi>\n (<\/mml:mo>\n d<\/mml:mi>\n ,<\/mml:mo>\n k<\/mml:mi>\n )<\/mml:mo>\n =<\/mml:mo>\n \n k<\/mml:mi>\n \n d<\/mml:mi>\n (<\/mml:mo>\n k<\/mml:mi>\n &#x2212;<\/mml:mo>\n 1<\/mml:mn>\n +<\/mml:mo>\n d<\/mml:mi>\n )<\/mml:mo>\n <\/mml:mrow>\n <\/mml:mfrac>\n <\/mml:math>\n and present an explicit protocol to attain this performance. Then, by utilising\n \n k<\/mml:mi>\n <\/mml:math>\n copies of an arbitrary target state\n \n |<\/mml:mo>\n &#x03C8;<\/mml:mi>\n &#x27E9;<\/mml:mo>\n <\/mml:math>\n , we show how the multicopy state teleportation protocol can be employed to enhance the success probability of storage and retrieval of quantum programs, which aims to universally retrieve the action of an arbitrary quantum channel that is stored in a state. Our proofs make use of group representation theory methods, which may find applications beyond the problems addressed in this work.\n <\/jats:p>","DOI":"10.22331\/q-2026-05-13-2105","type":"journal-article","created":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T07:08:30Z","timestamp":1778656110000},"page":"2105","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Multicopy quantum state teleportation with application to storage and retrieval of quantum programs"],"prefix":"10.22331","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8170-9668","authenticated-orcid":false,"given":"Fr\u00e9d\u00e9ric","family":"Grosshans","sequence":"first","affiliation":[{"name":"Sorbonne Universit\u00e9, CNRS, LIP6, F-75005 Paris, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0446-3059","authenticated-orcid":false,"given":"Micha\u0142","family":"Horodecki","sequence":"additional","affiliation":[{"name":"International Centre for Theory of Quantum Technologies, University of Gda\u0144sk, Jana Ba\u017cy\u0144skiego 1A, 80-309 Gda\u0144sk, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7861-1774","authenticated-orcid":false,"given":"Mio","family":"Murao","sequence":"additional","affiliation":[{"name":"Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan"},{"name":"Trans-scale Quantum Science Institute, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4182-907X","authenticated-orcid":false,"given":"Tomasz","family":"M\u0142ynik","sequence":"additional","affiliation":[{"name":"Institute of Theoretical Physics and Astrophysics, Faculty of Mathematics, Physics and Informatics, University of Gda\u0144sk, Wita Stwosza 57, 80-308 Gda\u0144sk, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1332-3477","authenticated-orcid":false,"given":"Marco T\u00falio","family":"Quintino","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9, CNRS, LIP6, F-75005 Paris, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5946-9845","authenticated-orcid":false,"given":"Micha\u0142","family":"Studzi\u0144ski","sequence":"additional","affiliation":[{"name":"International Centre for Theory of Quantum Technologies, University of Gda\u0144sk, Jana Ba\u017cy\u0144skiego 1A, 80-309 Gda\u0144sk, Poland"},{"name":"Institute of Theoretical Physics and Astrophysics, Faculty of Mathematics, Physics and Informatics, University of Gda\u0144sk, Wita Stwosza 57, 80-308 Gda\u0144sk, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0521-5209","authenticated-orcid":false,"given":"Satoshi","family":"Yoshida","sequence":"additional","affiliation":[{"name":"Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"9598","published-online":{"date-parts":[[2026,5,13]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"C. 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