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Limit on spatial quantum superpositions with massive objects due to phonons
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It has been a long-standing goal to bring massive objects into a superposition of different locations in real space, not only to confirm quantum theory in new regimes, but also to explore the interface with gravity. The main challenge is usually thought to arise from forces or scattering due to environmental fields and particles that decohere the large object's wave function into a statistical mixture. We unveil a decoherence channel which cannot be eliminated by improved isolation from the environment. It originates from sound waves within the object, which are excited as part of any splitting process and carry partial "Welcher Weg" information. This puts stringent constraints on future spatial superpositions of large objects.
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Mesoscopic mechanical superpositions by gluing individual quantum systems
A protocol in which a time-bin superposition of a single electron is converted, via surface capture and a pulsed electric field, into a mesoscopic superposition of nanoparticle momentum states with measurable interference.
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