Experimental quantum simulation of superradiant phase transition beyond no-go theorem via antisqueezing

Chen, Xi; Wu, Ze; Jiang, Min; Lü, Xin-You; Peng, Xinhua; Du, Jiangfeng

doi:10.1038/s41467-021-26573-5

Cited by 45 publications

(12 citation statements)

References 59 publications

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“…[25] that the quantum Rabi model (a single twolevel emitter coupled to a single mode bosonic field) also can undergo a SPT, when the ratio of atomic transition frequency Ω to the field frequency ω approaches infinity, i.e., Ω/ω → ∞. Such SPT requires a large light-matter interaction strength located in the ultra-strong coupling regime [26][27][28][29][30][31][32][33][34], which has been probed in a single trapped ion setup [35,36] and nuclear magnetic resonance (NMR) quantum simulator [37] with the great progress of experimental technologies. Motivated by the SPT of the Rabi model, there has been considerable amount of stud- * xinyoulu@hust.edu.cn ies concentrating on the extended Rabi models [38][39][40][41][42][43][44][45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Superradiant phase transition induced by the indirect Rabi interaction

Wen¹,

Wu²,

Lü³

2023

Preprint

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We theoretically study the superradiant phase transition (SPT) in an indirect Rabi model, where both a two-level system and a single mode bosonic field couple to an auxiliary bosonic field. We find that the indirect spin-field coupling induced by the virtual excitation of the auxiliary field can allow the occurrence of a SPT at a critical point, and the influence of the so-called A 2 term in the normal Rabi model is naturally avoided. In the large detuning regime, we present the analytical expression of quantum critical point in terms of the original system parameters. The critical atom-field coupling strength is tunable, which will loosen the conditions on realizing the SPT. Considering a hybrid magnon-cavity-qubit system, we predict the squeezed cat state of magnon generated with feasible experimental parameters, which has potential applications in quantum metrology and quantum information processing.

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Section: Introductionmentioning

confidence: 99%

Superradiant phase transition induced by the indirect Rabi interaction

Wen¹,

Wu²,

Lü³

2023

Preprint

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“…Recent efforts have been devoted to exploring many-body quantum phases emerging in light-matter coupling systems using different platforms such as cavity and circuit QED [1][2][3][4], and cold atoms in optical lattices [5][6][7]. The rapid development of such platforms offers high control and tunability, allowing for the exploration of richer phase diagrams with more complex critical behaviors, for example, the study of tricritical points (TCPs) and higher-order critical points (multicritical points).…”

Section: Introductionmentioning

confidence: 99%

Chiral quantum phases and tricriticality in a Dicke triangle

et al. 2022

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The existence of quantum tricriticality and exotic phases are found in a tricritical Dicke triangle (TDT) where three cavities, each one containing an ensemble of three-level atoms, are connected to each other through the action of an artificial magnetic field. The conventional superradiant phase (SR) is connected to the normal phase through first- and second-order boundaries, with tricritical points located at the intersection of such boundaries. Apart from the SR phase, a chiral superradiant (CSR) phase is found by tuning the artificial magnetic field. This phase is characterized by a nonzero photon current and its boundary presents chiral tricritical points (CTCPs). Through the study of different critical exponents, we are able to differentiate the universality class of the CTCP and TCP from that of second-order critical points, as well as find distinctive critical behavior among the two different superradiant phases. The TDT can be implemented in various systems, including atoms in optical cavities as well as the circuit QED system, allowing the exploration of a great variety of critical manifolds.

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“…Other effort to circumvent the difficulty of reaching a consensus on the existence of the AT is to find possibility to cancel the AT [76][77][78]. It has been suggested that the disappearing SPT of the Rabi (Dicke) model in the presence of the AT can be regained by combining the optomechanics and CQED [77,78].…”

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confidence: 99%

Switchable Superradiant Phase Transition with Kerr Magnons

Liu¹,

Xiong²,

Ying³

2023

Preprint

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The superradiant phase transition (SPT) has been widely studied in cavity quantum electrodynamics (CQED). However, this SPT is still subject of ongoing debates due to the no-go theorem induced by the so-called A 2 term (AT). We propose a hybrid quantum system, consisting of a singlemode cavity simultaneously coupled to both a two-level system and yttrium-iron-garnet sphere supporting magnons with Kerr nonlinearity, to restore the SPT against the AT. The Kerr magnons here can effectively introduce an additional strong and tunable AT to counteract the intrinsic AT, via adiabatically eliminating the degrees of freedom of the magnons. We show that the Kerr magnons induced SPT can exist in both cases of ignoring and including the intrinsic AT. Without the intrinsic AT, the critical coupling strength can be dramatically reduced by introducing the Kerr magnons, which greatly relaxes the experimental conditions for observing the SPT. With the intrinsic AT, the forbidden SPT can be recovered with the Kerr magnons in a reversed way. Our work paves a potential way to manipulate the SPT against the AT in hybrid systems combining CQED and nonlinear magnonics.

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Experimental quantum simulation of superradiant phase transition beyond no-go theorem via antisqueezing

Cited by 45 publications

References 59 publications

Superradiant phase transition induced by the indirect Rabi interaction

Superradiant phase transition induced by the indirect Rabi interaction

Chiral quantum phases and tricriticality in a Dicke triangle

Switchable Superradiant Phase Transition with Kerr Magnons

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