Observation of a Dissipative Time Crystal

Keßler, Hans; Kongkhambut, Phatthamon; Georges, Christoph; Mathey, Ludwig; Cosme, Jayson G.; Hemmerich, Andreas

doi:10.1103/physrevlett.127.043602

Cited by 156 publications

(87 citation statements)

References 37 publications

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“…A positive (negative) θ corresponds to an even (odd) lattice configuration. In our experimental system this symmetry is well established, and the system spontaneously breaks into either configuration upon self-organization [55].…”

Section: Experimental Setup and Measurement Protocol 21 Cavity-bec System And Superfluid-mott-insulator Transitionsupporting

confidence: 54%

Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment

et al. 2021

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The competition between short-range and cavity-mediated infinite-range interactions in a cavity-boson system leads to the existence of a superfluid phase and a Mott-insulator phase within the self-organized regime. In this work, we quantitatively compare the steady-state phase boundaries of this transition measured in experiments and simulated using the Multiconfigurational Time-Dependent Hartree Method for Indistinguishable Particles. To make the problem computationally feasible, we represent the full system by the exact many-body wave function of a two-dimensional four-well potential. We argue that the validity of this representation comes from the nature of both the cavity-atomic system and the Bose-Hubbard physics. Additionally, we show that the chosen representation only induces small systematic errors, and that the experimentally measured and theoretically predicted phase boundaries agree reasonably well. We thus demonstrate a new approach for the quantitative numerical modeling for the physics of the superfluid--Mott-insulator phase boundary.

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Section: Experimental Setup and Measurement Protocol 21 Cavity-bec System And Superfluid-mott-insulator Transitionsupporting

confidence: 54%

Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment

et al. 2021

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“…The robustness of the phenomenon to coupling to a bath, is of importance in view of a growing interest in the time crystal community towards dissipative limit cycles and period doubling phenomena in quantum optics related platforms [44,45,47,[93][94][95][96][97][98][99][100][101][102][103][104][105]. A thorough study of the interplay of noise and interactions lies beyond the scope of this work, but the resilience of subharmonic dynamics shown in Fig.…”

Section: Lindblad Evolutionmentioning

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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“…at once and entanglement between distinct particles. This work is also a harbinger of a future in which quantum many-body simulations using degenerate gases in cavities [25][26][27][28] will explore beyond mean-field physics by directly modifying and probing quantum fluctuations, or the quantum measurement process itself induces phase transitions 29 .…”

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confidence: 92%

mentioning

confidence: 99%

“…An entangled state is for the first time successfully injected into a Mach-Zehnder light-pulse interferometer with 1.7 +0.5 −0.5 dB of directly observed metrological enhancement. These results open a new path for combining particle delocalization and entanglement for inertial sensors 13; 14 , searches for new physics, particles, and fields [15][16][17][18][19][20][21] , future advanced gravitational wave detectors [22][23][24] , and accessing beyond mean-field quantum many-body physics [25][26][27][28][29] .Light-pulse matter-wave interferometers exploit the quantized 1 momentum kick given to atoms during absorption and emission 2 of light in order to split atomic wavepackets so that they traverse 3 distinct spatial paths at the same time. Additional momentum 4 kicks then return the atoms to the same point in space to inter-5 fere the two matter-wave packets.…”

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confidence: 99%

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Entanglement-enhanced matter-wave interferometry in a high-finesse cavity

Greve

Luo²,

et al. 2021

Preprint

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Entanglement is a fundamental resource that allows quantum sensors to surpass the standard quantum limit set by the quantum collapse of independent atoms. Collective cavity-QED systems have succeeded in generating large amounts of directly observed entanglement involving the internal degrees of freedom of laser-cooled atomic ensembles. Here we demonstrate cavity-QED entanglement of external degrees of freedom to realize a matter-wave interferometer of 700 atoms in which each individual atom falls freely under gravity and simultaneously traverses two paths through space while also entangled with the other atoms. We demonstrate both quantum non-demolition measurements and cavity-mediated spin interactions for generating squeezed momentum states with directly observed metrological gain 3.4^{+1.1}_{-0.9} dB and 2.5^{+0.6}_{-0.6} dB below the standard quantum limit respectively. An entangled state is for the first time successfully injected into a Mach-Zehnder light-pulse interferometer with 1.7^{+0.5}_{-0.5} dB of directly observed metrological enhancement. These results open a new path for combining particle delocalization and entanglement for inertial sensors, searches for new physics, particles, and fields, future advanced gravitational wave detectors, and accessing beyond mean-field quantum many-body physics.

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Observation of a Dissipative Time Crystal

Cited by 156 publications

References 37 publications

Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment

Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment

Stroboscopic aliasing in long-range interacting quantum systems

Entanglement-enhanced matter-wave interferometry in a high-finesse cavity

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