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 and support Heisenberg-limited multiparameter sensing.
Ancilla assisted Discrete Time Crystals in Non-interacting Spin Systems
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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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The Floquet central spin model: A platform to realize eternal time crystals, entanglement steering, and multiparameter metrology
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 and support Heisenberg-limited multiparameter sensing.