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Title: Probing many-body dynamics in a two-dimensional dipolar spin ensemble

Journal Article · · Nature Physics

Abstract The most direct approach for characterizing the quantum dynamics of a strongly interacting system is to measure the time evolution of its full many-body state. Despite the conceptual simplicity of this approach, it quickly becomes intractable as the system size grows. An alternate approach is to think of the many-body dynamics as generating noise, which can be measured by the decoherence of a probe qubit. Here we investigate what the decoherence dynamics of such a probe tells us about the many-body system. In particular, we utilize optically addressable probe spins to experimentally characterize both static and dynamical properties of strongly interacting magnetic dipoles. Our experimental platform consists of two types of spin defects in nitrogen delta-doped diamond: nitrogen-vacancy colour centres, which we use as probe spins, and a many-body ensemble of substitutional nitrogen impurities. We demonstrate that the many-body system’s dimensionality, dynamics and disorder are naturally encoded in the probe spins’ decoherence profile. Furthermore, we obtain direct control over the spectral properties of the many-body system, with potential applications in quantum sensing and simulation.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Novel Pathways to Quantum Coherence in Materials (NPQC)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Office (ARO)
Grant/Contract Number:
Energy Frontier Research Center (NPQC); SC0019241; AC02-05CH11231; W911NF-20-1-0136
OSTI ID:
1961894
Alternate ID(s):
OSTI ID: 2229045
Journal Information:
Nature Physics, Journal Name: Nature Physics Vol. 19 Journal Issue: 6; ISSN 1745-2473
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
France
Language:
English

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