Demonstration of an Effective Ultrastrong Coupling between Two Oscillators

Marković, Danijela; Jezouin, Sébastien; Ficheux, Quentin; Fedortchenko, Sergueï; Felicetti, Simone; Coudreau, Thomas; Milman, P.; Leghtas, Zaki; Huard, Benjamin

doi:10.1103/physrevlett.121.040505

Cited by 47 publications

(37 citation statements)

References 33 publications

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“…2 tem [167] using the proposal of Ref. [160], and USC between two resonators was simulated in superconducting circuits [168] following the proposal in Ref. [163].…”

Section: Simulating Ultrastrong Couplingmentioning

confidence: 99%

Ultrastrong coupling between light and matter

et al. 2019

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Ultrastrong coupling between light and matter has, in the past decade, transitioned from theoretical idea to experimental reality. It is a new regime of quantum light-matter interaction, going beyond weak and strong coupling to make the coupling strength comparable to the transition frequencies in the system. The achievement of weak and strong coupling has led to increased control of quantum systems and applications like lasers, quantum sensing, and quantum information processing. Here we review the theory of quantum systems with ultrastrong coupling, which includes entangled ground states with virtual excitations, new avenues for nonlinear optics, and connections to several important physical models. We also review the multitude of experimental setups, including superconducting circuits, organic molecules, semiconductor polaritons, and optomechanics, that now have achieved ultrastrong coupling. We then discuss the many potential applications that these achievements enable in physics and chemistry.

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“…2 tem [167] using the proposal of Ref. [160], and USC between two resonators was simulated in superconducting circuits [168] following the proposal in Ref. [163].…”

Section: Simulating Ultrastrong Couplingmentioning

confidence: 99%

Ultrastrong coupling between light and matter

et al. 2019

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“…Finite-component drivendissipative phase transitions can be implemented with bath-engineering techniques [23]. Furthermore, it has been recently shown [20] that finite-component phase transitions can be observed also with weakly-anharmonic quantum resonators, so our results could be extended to include nonlinear quantum resonator implemented with circuit-QED devices [29] and electromechanical systems [30].…”

Section: Analysis Of Resourcesmentioning

confidence: 96%

Critical Quantum Metrology with a Finite-Component Quantum Phase Transition

et al. 2020

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Physical systems close to a quantum phase transition exhibit a divergent susceptibility, suggesting that an arbitrarily-high precision may be achieved by exploiting quantum critical systems as probes to estimate a physical parameter. However, such an improvement in sensitivity is counterbalanced by the closing of the energy gap, which implies a critical slowing down and an inevitable growth of the protocol duration. Here, we design different metrological protocols that make use of the superradiant phase transition of the quantum Rabi model, a finite-component system composed of a single two-level atom interacting with a single bosonic mode. We show that, in spite of the critical slowing down, critical quantum optical systems can lead to a quantum-enhanced time-scaling of the quantum Fisher information, and so of the measurement sensitivity.In a system close to a critical point, small variations of physical parameters may lead to dramatic changes in the equilibrium state properties. The possibility of exploiting this sensitivity for metrological purposes is well known, and it has already been applied in classical devices, e.g. in superconducting transition-edge sensor [1]. Besides, the development of quantum metrology has extensively shown that quantum states can outperform their classical counterparts for sensing tasks [2]. Therefore, a question naturally arises: what sensitivity can be achieved using interacting systems close to a quantum-critical point? In the last few years, this question has attracted growing interest and it has been addressed by different methods [3][4][5][6][7][8][9]. These studies may be roughly divided in two classes.The first approach, which we will call the "dynamical" paradigm [5,7], focus on the time evolution induced by a Hamiltonian close to a critical point. In this approach, one prepares a probe system in a suitably chosen state, lets it evolve according to the critical Hamiltonian, and finally measures it. This bear close similarity to the standard interferometric paradigm of quantum metrology [2]. On the other hand, the "static" approach [3, 6] is based on the equilibrium properties of the system. It consists in preparing and measuring the system ground state in the unitary case, or the system steady-state when open quantum systems are considered. In proximity of the phase transition the susceptibility of the equilibrium state diverges, and so it does the achievable measurement precision. Unfortunately, the time required to prepare the equilibrium state diverges as well, both in the unitary [10] and in the driven-dissipative case [11,12], a behavior called critical slowing down. Only very re-cently, it has been demonstrated that for a large class of spin models these two approaches are formally equivalent [9], and that they both make it possible to achieve the optimal scaling limit of precision with respect to system size and to measurement time. These results were obtained considering spin systems that undergo quantum phase transitions in the thermodynamic limit, where the numb...

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“…As the parametric coupling is increased in situ, we find quantitative agreement with the theoretical predictions from weak to ultrastrong coupling. Looking forward, ultrastrong coupling of bosonic modes is predicted to have interesting ground state properties [28][29][30][31]. Quantum correlations induced by the FIG .…”

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confidence: 99%

Ultrastrong Parametric Coupling between a Superconducting Cavity and a Mechanical Resonator

et al. 2019

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We present a new optomechanical device where the motion of a micromechanical membrane couples to a microwave resonance of a three-dimensional superconducting cavity. With this architecture, we realize ultrastrong parametric coupling, where the coupling rate not only exceeds the dissipation rates in the system but also rivals the mechanical frequency itself. In this regime, the optomechanical interaction induces a frequency splitting between the hybridized normal modes that reaches 88% of the bare mechanical frequency, limited by the fundamental parametric instability. The coupling also exceeds the mechanical thermal decoherence rate, enabling new applications in ultrafast quantum state transfer and entanglement generation.

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Demonstration of an Effective Ultrastrong Coupling between Two Oscillators

Cited by 47 publications

References 33 publications

Ultrastrong coupling between light and matter

Ultrastrong coupling between light and matter

Critical Quantum Metrology with a Finite-Component Quantum Phase Transition

Ultrastrong Parametric Coupling between a Superconducting Cavity and a Mechanical Resonator

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