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Entanglement purification and quantum error correction
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We give a review on entanglement purification for bipartite and multipartite quantum states, with the main focus on theoretical work carried out by our group in the last couple of years. We discuss entanglement purification in the context of quantum communication, where we emphasize its close relation to quantum error correction. Various bipartite and multipartite entanglement purification protocols are discussed, and their performance under idealized and realistic conditions is studied. Several applications of entanglement purification in quantum communication and computation are presented, which highlights the fact that entanglement purification is a fundamental tool in quantum information processing.
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Optimizing LOCC Protocols on Product Stiefel Manifold
Fixed-round LOCC protocols are parameterized by a product Stiefel manifold and optimized with Riemannian gradient methods, yielding achievable distillation and state-merging fidelities that sometimes match PPT upper bounds.
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