Collapse-revival dynamics and atom-field entanglement in the nonresonant Dicke model

Alvermann, Andreas; Bakemeier, L.; Fehske, Holger

doi:10.1103/physreva.85.043803

Cited by 11 publications

(9 citation statements)

References 35 publications

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“…The system-wide entanglement is dramatically enhanced over the static or adiabatic QPT values. Our results extend current understanding of coupled light-matter systems beyond the equilibrium ground state [2,[14][15][16][17], and also they also stand apart from more recent studies of out-ofequilibrium critical behavior [3,[5][6][7][8][9]18]. Moreover, our fully quantum analysis covers all dynamical regimes from very slow adiabatic through to sudden quench, capturing at each stage the emergent non-linear self interactions * ol.acevedo53@uniandes.edu.co and correlations within and between each subsystem.…”

Section: Introductionsupporting

confidence: 76%

Large dynamic light-matter entanglement from driving neither too fast nor too slow

et al. 2015

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A significant problem facing next-generation quantum technologies is how to generate and manipulate macroscopic entanglement in light and matter systems. Here we report a new regime of dynamical light-matter behavior in which a giant, system-wide entanglement is generated by varying the light-matter coupling at intermediate velocities. This enhancement is far larger, broader-ranged, and more experimentally accessible, than that occurring near the quantum phase transition of the same model under adiabatic conditions. By appropriate choices of the coupling within this intermediate regime, the enhanced entanglement can be made to spread system-wide or to reside in each subsystem separately.

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Section: Introductionsupporting

confidence: 76%

Large dynamic light-matter entanglement from driving neither too fast nor too slow

et al. 2015

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“…Previous works on non-equilibrium DM under different settings have also confirmed that some major phenomena present here, such as spin squeezing, survive losses. Enhanced superradiance can be detected [36], and squeezing can still have time to develop [18,24]. We note that, despite perturbing the…”

Section: Scaling and Robustness Of Non-equilibrium Quantum Correlatiomentioning

confidence: 99%

“…Some previous works have already examined the dynamical emergence of quantum effects on each subsystem of the DM. However they focused on the semi-classical limit and a static coupling after a sudden quench [23][24][25][26], small dynamic oscillations around a phase space region [14], or under time-delayed feedback control [27]. Our work goes beyond this by giving a fully quantum analysis of the process of continuously turning on the interaction, in order to assess the emergent effects of the nonlinear self interaction in each subsystem.…”

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confidence: 99%

Robust quantum correlations in out-of-equilibrium matter–light systems

et al. 2015

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High precision macroscopic quantum control in interacting light-matter systems remains a significant goal toward novel information processing and ultra-precise metrology. We show that the out-of-equilibrium behavior of a paradigmatic light-matter system (Dicke model) reveals two successive stages of enhanced quantum correlations beyond the traditional schemes of near-adiabatic and sudden quenches. The first stage features magnification of matter-only and light-only entanglement and squeezing due to effective nonlinear self-interactions. The second stage results from a highly entangled light-matter state, with enhanced superradiance and signatures of chaotic and highly quantum states. We show that these new effects scale up consistently with matter system size, and are reliable even in dissipative environments.Many-body quantum dynamics are at the core of many natural and technological phenomena, from understanding of superconductivity or magnetism, to applications in quantum information processing as in adiabatic quantum computing [1]. Critical phenomena, defect formation, symmetry breaking, finite-size scaling are all aspects that emerge from the collective properties of the system [2]. Spin networks, many-body systems composed of the simplest quantum unit, are an obvious starting point to understand those phenomena, as they enclose much of their complex behavior in a highly controllable and tractable way. However, if the system under investigation includes a radiation subsystem, new opportunities arise for monitoring and characterizing the resulting collective phenomena [3,4]. By devising driving protocols of the light-matter interaction, high precision macroscopic control then becomes a possibility, regardless of whether the focus is on the matter subsystem, the light, or the composite manipulation of both. This is particularly true for the Dicke model (DM) [5], which is the subject of the present work.The DM describes a radiation-matter system which, despite its simplicity, exhibits a wide arrange of complex collective phenomena, many of them specifically associated with the existence of a quantum phase transition (QPT) [6]. Experimental realizations of the DM have been presented in different settings, from proposed realizations in circuit quantum electrodynamics [7], to the recent very successful demonstrations of DM superradiance in various cold atom experiments [8]. While the light and matter properties in the equilibrium ground state are relatively well known [9][10][11][12][13], its fully quantum out-of-equilibrium critical behavior is just starting to be understood [14,15].In the DM, both the matter and field are known to act as mediators of an effective nonlinear self-interaction involving each other [10,13]. These nonlinear interactions produce interesting phenomena in both atomic and optical systems [16,17]. Among the most relevant effects, there is the strong collapse and revival of squeezing [18,19], which in many matter states can be related to atom-atom entanglement [20]. Applications of such eff...

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“…To analyse this, it is convenient to discuss thoroughly the approximations that led into Eq. (16). The separation of timescales that justifies the averaging requires that the resulting effective dynamics does not occur at a rate comparable to the fast timescale.…”

Section: Resultsmentioning

confidence: 99%

“…The small coupling strength near the resonant regime has also been thoroughly investigated, resulting in the integrable Tavis-Cummings model [14] after performing a rotating-wave approximation. Several studies of the dynamics have been done with a variety of motivations, e.g., entanglement, collapses and revivals [15,16], behavior near the classical limit [17], and open system problems [18]. The dynamics in the small qubit frequency regime has also been explored [15], but mainly for low coupling strengths.…”

Section: Introductionmentioning

confidence: 99%

Dispersive Regimes of the Dicke Model

Barberena

Lamata

Solano

2017

Sci Rep

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We study two dispersive regimes of the Dicke model in the dynamics of N two-level atoms interacting with a bosonic mode for long interaction times. Firstly, we analyze the model for the regime in which the qubit frequencies are equal and smaller than the mode frequency, and for values of the coupling strength similar or larger than the mode frequency, namely, the deep strong coupling regime. Secondly, we address an interaction that is dependent on the photon number, where the coupling strength is comparable to the geometric mean of the qubit and mode frequencies. We show that the associated dynamics is analytically tractable and provide useful frameworks with which to analyze the system behavior. In the deep strong coupling regime, we unveil the structure of unexpected resonances for specific values of the coupling, present for N ≥ 2, and in the photon-number-dependent regime we demonstrate that all the nontrivial dynamical behavior occurs in the atomic degrees of freedom for a given Fock state. We verify these assertions with numerical simulations of the qubit population and photon-statistic dynamics.

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Collapse-revival dynamics and atom-field entanglement in the nonresonant Dicke model

Cited by 11 publications

References 35 publications

Large dynamic light-matter entanglement from driving neither too fast nor too slow

Large dynamic light-matter entanglement from driving neither too fast nor too slow

Robust quantum correlations in out-of-equilibrium matter–light systems

Dispersive Regimes of the Dicke Model

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