Colloquium: Quantum and classical discrete time crystals

MP Zaletel, M Lukin, C Monroe, C Nayak, F Wilczek… - Reviews of Modern …, 2023 - APS
The spontaneous breaking of time-translation symmetry has led to the discovery of a new
phase of matter: the discrete time crystal. Discrete time crystals exhibit rigid subharmonic …

Condensed matter physics in time crystals

L Guo, P Liang - New Journal of Physics, 2020 - iopscience.iop.org
Time crystals are physical systems whose time translation symmetry is spontaneously
broken. Although the spontaneous breaking of continuous time-translation symmetry in static …

All-optical dissipative discrete time crystals

H Taheri, AB Matsko, L Maleki, K Sacha - Nature communications, 2022 - nature.com
Time crystals are periodic states exhibiting spontaneous symmetry breaking in either time-
independent or periodically-driven quantum many-body systems. Spontaneous modification …

Generalized quantum circuit differentiation rules

O Kyriienko, VE Elfving - Physical Review A, 2021 - APS
Variational quantum algorithms that are used for quantum machine learning rely on the
ability to automatically differentiate parametrized quantum circuits with respect to underlying …

Creating and controlling global Greenberger-Horne-Zeilinger entanglement on quantum processors

Z Bao, S Xu, Z Song, K Wang, L Xiang, Z Zhu… - Nature …, 2024 - nature.com
Abstract Greenberger-Horne-Zeilinger (GHZ) states, also known as two-component
Schrödinger cats, play vital roles in the foundation of quantum physics and the potential …

Quantum metrology with boundary time crystals

V Montenegro, MG Genoni, A Bayat… - Communications …, 2023 - nature.com
Quantum sensing is one of the arenas that exemplifies the superiority of quantum
technologies over their classical counterparts. Such superiority, however, can be diminished …

Many-body physics in the nisq era: Quantum programming a discrete time crystal

M Ippoliti, K Kechedzhi, R Moessner, SL Sondhi… - PRX Quantum, 2021 - APS
Recent progress in the realm of noisy intermediate-scale quantum (NISQ) devices [J.
Preskill, Quantum 2, 79 (2018)] represents an exciting opportunity for many-body physics by …

Isolated Heisenberg magnet as a quantum time crystal

M Medenjak, B Buča, D Jaksch - Physical Review B, 2020 - APS
We demonstrate analytically and numerically that the paradigmatic model of quantum
magnetism, the Heisenberg XXZ spin chain, does not equilibrate. It constitutes an example …

Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving

N Maskara, AA Michailidis, WW Ho, D Bluvstein… - Physical Review Letters, 2021 - APS
The control of many-body quantum dynamics in complex systems is a key challenge in the
quest to reliably produce and manipulate large-scale quantum entangled states. Recently …

Bounds in nonequilibrium quantum dynamics

Z Gong, R Hamazaki - International Journal of Modern Physics B, 2022 - World Scientific
We review various bounds concerning out-of-equilibrium dynamics in few-level and many-
body quantum systems. We primarily focus on closed quantum systems but will also mention …