# Discrete Time Crystals

@article{Else2019DiscreteTC, title={Discrete Time Crystals}, author={Dominic Victor Else and Christopher R. Monroe and C. Nayak and Norman Y. Yao}, journal={arXiv: Strongly Correlated Electrons}, year={2019} }

Experimental advances have allowed for the exploration of nearly isolated quantum many-body systems whose coupling to an external bath is very weak. A particularly interesting class of such systems is those which do not thermalize under their own isolated quantum dynamics. In this review, we highlight the possibility for such systems to exhibit new non-equilibrium phases of matter. In particular, we focus on "discrete time crystals", which are many-body phases of matter characterized by a…

## 79 Citations

Classical discrete time crystals

- Physics
- 2018

The spontaneous breaking of time-translation symmetry in periodically driven quantum systems leads to a new phase of matter: the discrete time crystal (DTC). This phase exhibits collective…

Quantum Time Crystals from Hamiltonians with Long-Range Interactions.

- Physics, MedicinePhysical review letters
- 2019

This study proposes a form of a Hamiltonian for which the unitary dynamics exhibits the time crystalline behavior and breaks continuous TTS, based on a spin-1/2 many-body Hamiltonian which has long-range multispin interactions in the form of spin strings, thus bypassing previously known no-go theorems.

Ancilla assisted Discrete Time Crystals in Non-interacting Spin Systems

- Physics
- 2021

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…

Ju l 2 01 9 Continuous time crystals from static Hamiltonians with long-range interactions

- 2019

Time crystals correspond to a phase of matter where time-translational symmetry (TTS) is broken. Up to date, they are well studied in open quantum systems, where external drive allows to break…

Discrete time crystals in Bose-Einstein condensates and the symmetry-breaking edge in a simple two-mode theory

- PhysicsPhysical Review A
- 2021

Discrete time crystals (DTCs) refer to a novel many-body steady state that spontaneously breaks the discrete time-translational symmetry in a periodically-driven quantum system. Here, we study DTCs…

Weak ergodicity breaking through the lens of quantum entanglement

- Physics
- 2021

Recent studies of interacting systems of quantum spins, ultracold atoms and correlated fermions have shed a new light on how isolated many-body systems can avoid rapid equilibration to their thermal…

Many-body–localized discrete time crystal with a programmable spin-based quantum simulator

- Medicine, PhysicsScience
- 2021

The results are consistent with the realization of an out-of-equilibrium Floquet phase of matter and introduce a programmable quantum simulator based on solid-state spins for exploring many-body physics.

Observation of Stark many-body localization without disorder.

- Physics, MedicineNature
- 2021

The results demonstrate the unexpected generality of MBL, with implications about the fundamental requirements for thermalization and with potential uses in engineering long-lived non-equilibrium quantum matter.

Time crystals in a shaken atom-cavity system

- Physics
- 2019

We demonstrate the emergence of a time crystal of atoms in a high-finesse optical cavity driven by a phase-modulated transverse pump field, resulting in a shaken lattice. This shaken system exhibits…

Estimating Heating Times in Periodically Driven Quantum Many-Body Systems via Avoided Crossing Spectroscopy

- Computer Science, Physics
- 2020

This article develops a method able to resolve individual crossings of the Floquet propagator and show how to construct the heating rate based on these, closely related to the Fermi Golden Rule approach for weak drives, but can go beyond it, since it captures non-perturbative effects by construction.

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