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Efficient amplification of photonic qubits by optimal quantum cloning
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SYSNO ASEP 0436684 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Efficient amplification of photonic qubits by optimal quantum cloning Author(s) Bartkiewicz, K. (PL)
Černoch, A. (CZ)
Lemr, K. (CZ)
Soubusta, Jan (FZU-D) RID, ORCID
Stobińska, M. (PL)Source Title Physical Review A. - : American Physical Society - ISSN 1050-2947
Roč. 89, č. 6 (2014), "062322-1"-"062322-10"Number of pages 10 s. Language eng - English Country US - United States Keywords optimal quantum cloning ; cryptography ; qubit ; phase-independent quantum amplifier Subject RIV BH - Optics, Masers, Lasers Institutional support FZU-D - RVO:68378271 UT WOS 000338363700007 EID SCOPUS 84903540051 DOI https://doi.org/10.1103/PhysRevA.89.062322 Annotation We demonstrate that a phase-independent quantum amplifier of a polarization qubit is a complementary amplifier of the heralded qubit amplifier [N. Gisin, S. Pironio, and N. Sangouard, Phys. Rev. Lett. 105, 070501 (2010)]. It employs the multifunctional cloner in the 1 -> 2 copying regime, capable of providing approximate copies of qubits given by various probability distributions, and is optimized for distributions with axial symmetry. Direct applications of the proposed solution are possible in quantum technologies, doubling the range where quantum information is coherently broadcast. It also outperforms natural nonlinear amplifiers that use stimulated emission in bulk nonlinear materials. We consider the amplifier to be an important tool for amplifying quantum information sent via quantum channels with phase-independent damping. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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