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QI: Fachverband Quanteninformation

QI 5: Implementations: Solid State Systems

QI 5.6: Vortrag

Dienstag, 21. September 2021, 15:45–16:00, H4

Ancilla assisted discrete quantum time crystal with nitrogen-vacancy center in diamond — •Jianpei Geng, Vadim Vorobyov, Durga Dasari, and Jörg Wrachtrup — 3. Physics Institute, University of Stuttgart, Stuttgart 70569, Germany

Time crystal is a phase of matter of which the time-translation symmetry is spontaneously broken. Though continuous quantum time crystal is controversial, discrete quantum time crystal has been experimentally demonstrated in various systems. The interplay of periodic driving, disorder, and interaction plays an essential role in stabilizing the time crystal phase against perturbations. Here we extend the study to even non-interacting systems and show how a non-interacting system could be stabilized to the time-crystal phase by coupling to an ancillary system. We show that the coupling between the system and the ancilla, even if just an ancilla qubit, could introduce an effective interaction in the system, and thus enables the emergence of the time-crystal phase. We demonstrate the time-crystal signature of non-interacting nuclear spins by simulation and experiment on nitrogen-vacancy center in diamond.