Abstract
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.
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Wen, JJ., Yeon, KH., Wang, HF. et al. Scheme for implementing the optimal quantum cloning via long-range off-resonant Raman coupling. Journal of the Korean Physical Society 63, 1696–1702 (2013). https://doi.org/10.3938/jkps.63.1696
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DOI: https://doi.org/10.3938/jkps.63.1696