Projections and teleportation of operator quenches in CFT

Gyongyosi, Zsolt; Hollowood, Timothy; Kumar, Prem

doi:10.1007/jhep08(2025)081

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Projections and teleportation of operator quenches in CFT

Zsolt Gyongyosi

, Timothy Hollowood

, Prem Kumar

Journal of High Energy Physics, Volume: 2025, Issue: 8

Swansea University Authors: Timothy Hollowood , Prem Kumar

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DOI (Published version): 10.1007/jhep08(2025)081

Abstract

Motivated by recent proposals for information recovery from black holes via non-isometric maps and post-selection in an effective description, we set up and investigate a teleportation scenario in a 2d CFT involving a local operator quench and projection on a portion of space onto a Cardy state with...

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Published in:	Journal of High Energy Physics
ISSN:	1029-8479
Published:	Springer Science and Business Media LLC 2025
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa70790

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last_indexed	2025-11-21T18:10:19Z
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spelling	2025-11-20T14:28:25.9698428 v2 70790 2025-10-29 Projections and teleportation of operator quenches in CFT ea9ca59fc948276ff2ab547e91bdf0c2 0000-0002-3258-320X Timothy Hollowood Timothy Hollowood true false 087fd097167d724ce1b13cb285741ef5 0000-0003-0867-4213 Prem Kumar Prem Kumar true false 2025-10-29 BGPS Motivated by recent proposals for information recovery from black holes via non-isometric maps and post-selection in an effective description, we set up and investigate a teleportation scenario in a 2d CFT involving a local operator quench and projection on a portion of space onto a Cardy state with the theory in the vacuum state. Using conformal invariance the system can be mapped to CFT with boundary (BCFT). Rényi entropies for spatial intervals in the projected state can then be computed as a function of the location of the quench, either using the replica method, or using twist fields, the latter employing universal results for correlators at large c. We find qualitatively distinct behaviours in the two systems. Our replica computations reveal a surprising universal n dependence of Rényi entropies which implies that teleportation does occur but is not optimal as would be expected because the projector is not especially tuned. We also find that the curious n dependence of the Rényi entropies means that the limit to the von Neumann entropy is not straightforward. Journal Article Journal of High Energy Physics 2025 8 Springer Science and Business Media LLC 1029-8479 Scale and Conformal Symmetries; Boundary Quantum Field Theory; Field Theories in Lower Dimensions 12 8 2025 2025-08-12 10.1007/jhep08(2025)081 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Other TJH and SPK would like to acknowledge support from STFC Consolidated Grant Award ST/X000648/1. ZG is supported by an STFC PhD studentship award. 2025-11-20T14:28:25.9698428 2025-10-29T07:20:38.5273595 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Zsolt Gyongyosi 0000-0002-4377-9021 1 Timothy Hollowood 0000-0002-3258-320X 2 Prem Kumar 0000-0003-0867-4213 3 70790__35491__cbe8cfe88e8f4f40802db31bf2c37f65.pdf JHEP08(2025)081.pdf 2025-10-29T07:24:50.7158100 Output 636425 application/pdf Version of Record true 2025-08-12T00:00:00.0000000 This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0). true eng http://creativecommons.org/licenses/by/4.0/
title	Projections and teleportation of operator quenches in CFT
spellingShingle	Projections and teleportation of operator quenches in CFT Timothy Hollowood Prem Kumar
title_short	Projections and teleportation of operator quenches in CFT
title_full	Projections and teleportation of operator quenches in CFT
title_fullStr	Projections and teleportation of operator quenches in CFT
title_full_unstemmed	Projections and teleportation of operator quenches in CFT
title_sort	Projections and teleportation of operator quenches in CFT
author_id_str_mv	ea9ca59fc948276ff2ab547e91bdf0c2 087fd097167d724ce1b13cb285741ef5
author_id_fullname_str_mv	ea9ca59fc948276ff2ab547e91bdf0c2_*_Timothy Hollowood 087fd097167d724ce1b13cb285741ef5_*_Prem Kumar
author	Timothy Hollowood Prem Kumar
author2	Zsolt Gyongyosi Timothy Hollowood Prem Kumar
format	Journal article
container_title	Journal of High Energy Physics
container_volume	2025
container_issue	8
publishDate	2025
institution	Swansea University
issn	1029-8479
doi_str_mv	10.1007/jhep08(2025)081
publisher	Springer Science and Business Media LLC
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description	Motivated by recent proposals for information recovery from black holes via non-isometric maps and post-selection in an effective description, we set up and investigate a teleportation scenario in a 2d CFT involving a local operator quench and projection on a portion of space onto a Cardy state with the theory in the vacuum state. Using conformal invariance the system can be mapped to CFT with boundary (BCFT). Rényi entropies for spatial intervals in the projected state can then be computed as a function of the location of the quench, either using the replica method, or using twist fields, the latter employing universal results for correlators at large c. We find qualitatively distinct behaviours in the two systems. Our replica computations reveal a surprising universal n dependence of Rényi entropies which implies that teleportation does occur but is not optimal as would be expected because the projector is not especially tuned. We also find that the curious n dependence of the Rényi entropies means that the limit to the von Neumann entropy is not straightforward.
published_date	2025-08-12T05:33:36Z
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score	11.096068

Projections and teleportation of operator quenches in CFT

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