Abstract
The unavoidable coupling between a quantum state and its environment leads to decoherence. Weak measurements—indirectly observing a quantum state without disturbing it—are now shown to be a useful tool for reducing or even nullifying the effects of decoherence. Decoherence, often caused by unavoidable coupling with the environment, leads to degradation of quantum coherence1. For a multipartite quantum system, decoherence leads to degradation of entanglement and, in certain cases, entanglement sudden death2,3. Tackling decoherence, thus, is a critical issue faced in quantum information, as entanglement is a vital resource for many quantum information applications including quantum computing4, quantum cryptography5, quantum teleportation6,7,8 and quantum metrology9. Here, we propose and demonstrate a scheme to protect entanglement from decoherence. Our entanglement protection scheme makes use of the quantum measurement itself for actively battling against decoherence and it can effectively circumvent even entanglement sudden death.
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