Scheme for implementing the optimal quantum cloning via long-range off-resonant Raman coupling

Autor:	Kyu-Hwang Yeon, Shou Zhang, Hong-Fu Wang, Jing-Ji Wen
Rok vydání:	2013
Předmět:	Physics Coupling Optical fiber Physics::Optics General Physics and Astronomy Rotation law.invention symbols.namesake law Excited state symbols Spontaneous emission Fiber Atomic physics Quantum cloning Raman spectroscopy
Zdroj:	Journal of the Korean Physical Society. 63:1696-1702
ISSN:	1976-8524 0374-4884
Popis:	We propose a physical scheme to implement the optimal 1 → 2 quantum cloning via long-range off-resonant Raman coupling for distant atoms trapped in separate cavities connected by optical fibers. We show that, if the single-qubit rotation angles are choosen appropriately, the optimal symmetric (asymmetric) universal quantum cloning and optimal symmetric (asymmetric) phase-covariant cloning can be effectively realized. The scheme is insensitive to cavity decay, fiber loss, and atomic spontaneous emission because the effective long-distance interaction induced by long-range off-resonant Raman coupling is mediated by the vacuum fields of the fiber and cavity and because the total system evolves in the decoherence-free subspace in which neither of the subsystems is excited.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f0b0fcc423ce4988b6a15bfcfddbe2f8 https://doi.org/10.3938/jkps.63.1696 Zobrazit plný text záznamu Full text from SpringerLink