Abstract
Coherent many-body quantum dynamics lies at the heart of quantum simulation and quantum computation. Both require coherent evolution in the exponentially large Hilbert space of an interacting many-body system. To date, trapped ions have defined the state of the art in terms of achievable coherence times in interacting spin chains. Here, we establish an alternative platform by reporting on the observation of coherent, fully interaction-driven quantum revivals of the magnetization in Rydberg-dressed Ising spin chains of atoms trapped in an optical lattice. We identify partial many-body revivals at up to about ten times the characteristic time scale set by the interactions. At the same time, single-site-resolved correlation measurements link the magnetization dynamics with inter-spin correlations appearing at different distances during the evolution. These results mark an enabling step towards the implementation of Rydberg atom based quantum annealers, quantum simulations of higher dimensional complex magnetic Hamiltonians, and itinerant long-range interacting quantum matter.
Highlights
The coherent unitary evolution of closed many-body quantum systems initially prepared in a superposition of different eigenstates is one of the most fundamental concepts of quantum theory
Coherent many-body quantum dynamics lies at the heart of quantum simulation and quantum computation
We establish an alternative platform by reporting on the observation of coherent, fully interactiondriven quantum revivals of the magnetization in Rydberg-dressed Ising spin chains of atoms trapped in an optical lattice
Summary
The coherent unitary evolution of closed many-body quantum systems initially prepared in a superposition of different eigenstates is one of the most fundamental concepts of quantum theory It predicts a fast dephasing of the initial state, followed by its revival after long times. A much more complex many-body dynamics is expected when the full Hilbert space is accessible in the time evolution, and in particular in systems with long-range interactions Quantum magnets featuring such interactions have been realized recently with trapped ions [9,10,11,12], ground state molecules [13], magnetic atoms [14], and neutral atoms coupled to Rydberg states on resonance [15,16] or off resonantly [17,18]. Single-spin resolved correlation measurements reveal the microscopic origin of the interactioninduced collapse dynamics at short times
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