Stable macroscopic quantum superpositions |
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Authors: | Fröwis F Dür W |
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Institution: | Institut für Theoretische Physik, Universit?t Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria. |
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Abstract: | We study the stability of superpositions of macroscopically distinct quantum states under decoherence. We introduce a class of quantum states with entanglement features similar to Greenberger-Horne-Zeilinger (GHZ) states, but with an inherent stability against noise and decoherence. We show that in contrast to GHZ states, these so-called concatenated GHZ states remain multipartite entangled even for macroscopic numbers of particles and can be used for quantum metrology in noisy environments. We also propose a scalable experimental realization of these states using existing ion-trap setups. |
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