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Ancilla assisted Discrete Time Crystals in Non-interacting Spin Systems

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arxiv 2107.11748 v1 pith:WZGVJU65 submitted 2021-07-25 quant-ph cond-mat.mes-hall

Jianpei Geng , Vadim Vorobyov , Durga Dasari , Joerg Wrachtrup This is my paper · ORCID
classification quant-phcond-mat.mes-hall
keywords spinsystemsancillarycrystalsdiscreteerrorsinteractionnon-interacting
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We show here through experiments and exact analytical models the emergence of discrete time translation symmetry breaking in non-interacting systems. These time-periodic structures become stable against perturbations only in the presence of their interaction with the ancillary quantum system and display subharmonic response over a range of rotation angle errors. We demonstrate this effect for central spin and spin-mechanical systems, where the ancillary induced interaction among the spins stabilizes the spin dynamics against finite errors. Further, we extend these studies and show the possibility to even achieve non-local (remote) synchronization of such Floquet crystals.

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  1. The Floquet central spin model: A platform to realize eternal time crystals, entanglement steering, and multiparameter metrology

    quant-ph 2025-01 reject novelty 6.0 of 10

    Eternal discrete time crystals, including higher-order ones with periods of 12T or 24T, can be realized in the driven central spin model at specific interaction strengths, and these phases can generate Bell-cat states...

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