Discrete Time Crystals and Related Phenomena

Sacha, Krzysztof

doi:10.1007/978-3-030-52523-1_4

Cited by 2 publications

(1 citation statement)

References 165 publications

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“…quantum systems [27][28][29] has recently morphed into the search for quantum time crystals [30][31][32][33]. A discrete time crystal (DTC) occurs when the discrete time translation symmetry of a periodically driven system is spontaneously broken into a smaller symmetry subgroup.…”

Section: Introductionmentioning

confidence: 99%

Stroboscopic aliasing in long-range interacting quantum systems

et al. 2021

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We unveil a mechanism for generating oscillations with arbitrary multiplets of the period of a given external drive, in long-range interacting quantum many-particle spin systems. These oscillations break discrete time translation symmetry as in time crystals, but they are understood via two intertwined stroboscopic effects similar to the aliasing resulting from video taping a single fast rotating helicopter blade. The first effect is similar to a single blade appearing as multiple blades due to a frame rate that is in resonance with the frequency of the helicopter blades' rotation; the second is akin to the optical appearance of the helicopter blades moving in reverse direction. Analogously to other dynamically stabilized states in interacting quantum many-body systems, this stroboscopic aliasing is robust to detuning and excursions from a chosen set of driving parameters, and it offers a novel route for engineering dynamical n-tuplets in long-range quantum simulators, with potential applications to spin squeezing generation and entangled state preparation.

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Section: Introductionmentioning

confidence: 99%

Stroboscopic aliasing in long-range interacting quantum systems

et al. 2021

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Nonlinear two-level dynamics of quantum time crystals

et al. 2022

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A time crystal is a macroscopic quantum system in periodic motion in its ground state. In our experiments, two coupled time crystals consisting of spin-wave quasiparticles (magnons) form a macroscopic two-level system. The two levels evolve in time as determined intrinsically by a nonlinear feedback, allowing us to construct spontaneous two-level dynamics. In the course of a level crossing, magnons move from the ground level to the excited level driven by the Landau-Zener effect, combined with Rabi population oscillations. We demonstrate that magnon time crystals allow access to every aspect and detail of quantum-coherent interactions in a single run of the experiment. Our work opens an outlook for the detection of surface-bound Majorana fermions in the underlying superfluid system, and invites technological exploitation of coherent magnon phenomena – potentially even at room temperature.

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Discrete Time Crystals and Related Phenomena

Cited by 2 publications

References 165 publications

Stroboscopic aliasing in long-range interacting quantum systems

Stroboscopic aliasing in long-range interacting quantum systems

Nonlinear two-level dynamics of quantum time crystals

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