Emerging Dissipative Phases in a Superradiant Quantum Gas with Tunable Decay

Ferri, Francesco; Rosa-Medina, Rodrigo; Finger, Fabian; Dogra, Nishant; Soriente, Matteo; Zilberberg, Oded; Donner, Tobias; Esslinger, Tilman

doi:10.1103/physrevx.11.041046

Cited by 52 publications

(20 citation statements)

References 84 publications

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“…Such a hysteresis loop between the coexistent normal and superradiant phases has recently been observed experimentally in Ref. [43].…”

Section: A Emergence Of Superradiancesupporting

confidence: 54%

Lasing and counter-lasing phase transitions in a cavity QED system

Stitely,

Giraldo,

Krauskopf

et al. 2022

Preprint

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We study the effect of spontaneous emission and incoherent atomic pumping on the nonlinear semiclassical dynamics of the unbalanced Dicke model -a generalization of the Dicke model that features independent coupling strengths for the co-and counter-rotating interaction terms. As well as the ubiquitous superradiant behavior the Dicke model is well-known for, the addition of spontaneous emission combined with the presence of strong counter-rotating terms creates laser-like behavior termed counter-lasing. These states appear in the semiclassical model as stable periodic orbits. We perform a comprehensive dynamical analysis of the appearance of counter-lasing in the unbalanced Dicke model subject to strong cavity dissipation, such that the cavity field can be adiabatically eliminated to yield an effective Lipkin-Meshkov-Glick (LMG) model. If the coupling strength of the co-rotating interactions is small, then the counter-lasing phase appears via a Hopf bifurcation of the de-excited state. We find that if the rate of spontaneous emission is small, this can lead to resurgent superradiant pulses. However, if the co-rotating coupling is larger, then the counter-lasing phase must emerge via the steady-state superradiant phase. Such a transition is the result of the competition of the coherent and incoherent processes that drive superradiance and counter-lasing, respectively. We observe a surprisingly complex transition between the two, associated with the formation of a chaotic attractor over a thin transitional parameter region.

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“…Such a hysteresis loop between the coexistent normal and superradiant phases has recently been observed experimentally in Ref. [43].…”

Section: A Emergence Of Superradiancesupporting

confidence: 54%

Lasing and counter-lasing phase transitions in a cavity QED system

Stitely,

Giraldo,

Krauskopf

et al. 2022

Preprint

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“…To derive a HEOM that includes feedback we start from the SSE in Stratonovich convention as described in appendix A. There the rules for stochastic integration allow to simply add the feedback Hamiltonian (31), which describes linear feedback based on the measurement of a single mode k. We obtain…”

Section: Appendix C: Homodyne Cheom With Feedbackmentioning

confidence: 99%

“…In recent years, interest has shifted from few particle systems to the control of many-body quantum systems. For example, there are opportunities to explore particularly interesting many-body physics [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] with many atoms in optical cavities in regimes where the atoms interact strongly amongst themselves and also with the cavity mode(s), as depicted in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

Link¹,

Müller²,

Lena³

et al. 2021

Preprint

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Atoms in multimode cavity QED systems provide an exciting platform to study many-body phenomena in regimes where the atoms are strongly coupled amongst themselves and with the cavity. An important challenge in this, and other related non-Markovian open quantum systems is to understand what information we gain about the atoms from continuous measurement of the output light. In this work, we address this problem, describing the reduced atomic state via a conditioned hierarchy of equations of motion, which provides an exact conditioned reduced description under monitoring (and continuous feedback). We utilise this formalism to study how different monitoring for modes of a multimode cavity affects our information gain for an atomic state, and to improve spin squeezing via measurement and feedback in a strong coupling regime. This work opens opportunities to understand continuous monitoring of non-Markovian open quantum systems, both on a practical and fundamental level.

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“…Bistability in driven-dissipative models usually means the presence of two possible stationary states of the system that can be distinguished by local observable measurements. Although on the level of the meanfield approximation it can be easily established whether or not it exists, its actual existence, in particular in low-dimensional strongly interacting systems, remains quite controversial with both theoretical and experimental work reporting differing conclusions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The existing approaches usually rely on sophisticated theoretical techniques for including perturbations of finite-size corrections to the mean-field or large scale efficient numerical simulations such as t-DMRG [8] or projected entangled pair states (PEPS) [16].…”

Section: Introductionmentioning

confidence: 99%

Exact bistability and time pseudo-crystallization of driven-dissipative fermionic lattices

Alaeian¹,

Buča²

2022

Preprint

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The existence of bistability in quantum optical systems remains a intensely debated open question beyond the mean-field approximation. Quantum fluctuations are finite-size corrections to the mean-field approximation used because the full exact solution is unobtainable. Usually, quantum fluctuations destroy the bistability present on the mean-field level. Here, by identifying and using exact modulated semi-local dynamical symmetries in a certain quantum optical models of drivendissipative fermionic chains we exactly prove bistability in precisely the quantum fluctuations. Surprisingly, rather than destroying bistability, the quantum fluctuations themselves exhibit bistability, even though it is absent on the mean-field level for our systems. Moreover, the models studied acquire additional thermodynamic dynamical symmetries that imply persistent periodic oscillations in the quantum fluctuations, constituting pseudo-variants of boundary time crystals. Physically, these emergent operators correspond to finite-frequency and finite-momentum semi-local Goldstone modes. Our work therefore provides to the best of our knowledge the first example of a provably bistable quantum optical system.

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Emerging Dissipative Phases in a Superradiant Quantum Gas with Tunable Decay

Cited by 52 publications

References 84 publications

Lasing and counter-lasing phase transitions in a cavity QED system

Lasing and counter-lasing phase transitions in a cavity QED system

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

Exact bistability and time pseudo-crystallization of driven-dissipative fermionic lattices

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