2003/10/20 by Radim Filip, R. Filip, Jaromı́r Fiurášek +3 · 1 citation
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph
paper · pdf · doi:10.1103/physreva.69.012314
published as Phys. Rev. A 69, 012314 (2004). · 7 pages, 5 figures
arxiv created 2003/10/20 · openalex publication_date 2004/01/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze a reversibility of optimal Gaussian \stackrel\ensuremath→12 quantum cloning of a coherent state using only local operations on the clones and classical communication between them and propose a feasible experimental test of this feature. Performing Bell-type homodyne measurement on one clone and anticlone, an arbitrary unknown input state (not only a coherent state) can be restored in the other clone by applying appropriate local unitary displacement operation. We generalize this concept to a partial reversal of the cloning using only local operations and classical communication (LOCC) and we show that this procedure converts the symmetric cloner to an asymmetric cloner. Further, we discuss a distributed LOCC reversal in optimal \stackrel\ensuremath→1M Gaussian cloning of coherent states which transforms it to optimal \stackrel\ensuremath→1M^\ensuremath' cloning for M^\ensuremath'<M. Assuming the quantum cloning as a possible eavesdropping attack on quantum communication link, the reversibility can be utilized to improve the security of the link even after the attack.