State Exchange with Quantum Side Information
Author(s)
Lee, Yonghae; Takagi, Ryuji; Yamasaki, Hayata; Adesso, Gerardo; Lee, Soojoon
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We consider a quantum communication task between two users Alice and Bob, in which Alice and Bob exchange their respective quantum information by means of local operations and classical communication assisted by shared entanglement. Here, we assume that Alice and Bob may have quantum side information, not transferred, and classical communication is free. In this work, we derive general upper and lower bounds for the least amount of entanglement which is necessary to perfectly perform this task, called the state exchange with quantum side information. Moreover, we show that the optimal entanglement cost can be negative when Alice and Bob make use of their quantum side information. We finally provide conditions on the initial state for the state exchange with quantum side information which give the exact optimal entanglement cost.
Date issued
2019-01Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Lee, Yonghae, et al. “State Exchange with Quantum Side Information.” Physical Review Letters, vol. 122, no. 1, Jan. 2019. © 2019 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114