Ultrastrongly dissipative quantum Rabi model

Zueco, David; García-Ripoll, Juan José

doi:10.1103/physreva.99.013807

Cited by 43 publications

(51 citation statements)

References 48 publications

(82 reference statements)

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“…To estimate if this regime is reachable, the spin excitations and photons must exchange populations coherently in the form of vacuum Rabi oscillations before they are damped out. The condition to have such oscillations is given by: [44,45]. In our case, κ can reach the Hz range easily, whereas typical ferromagnetic materials exhibit Δω n ∼MHz at best.…”

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confidence: 85%

Quantum electrodynamics with magnetic textures

Pérez

Zueco

2019

New J. Phys.

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Coherent exchange between photons and different matter excitations (like qubits, acoustic surface waves or spins) allows for the entanglement of light and matter and provides a toolbox for performing fundamental quantum physics. On top of that, coherent exchange is a basic ingredient in the majority of quantum information processors. In this work, we develop the theory for coupling between magnetic textures (vortices and skyrmions) stabilized in ferromagnetic nanodiscs and microwave photons generated in a superconducting circuit. Within this theory we show that this hybrid system serves for performing broadband spectroscopy of the magnetic textures. We also discuss the possibility of reaching the strong coupling regime between these texture excitations and a single photon residing in a microwave superconducting cavity.

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confidence: 85%

Quantum electrodynamics with magnetic textures

Pérez

Zueco

2019

New J. Phys.

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“…where the qubit is directly coupled to a structured bosonic bath with an effective spectral density function that, in the continuum limit, reads [36,44,45]…”

Section: Flux Qubit Coupled To a Dissipative Resonatormentioning

confidence: 99%

Transmission spectra of an ultrastrongly coupled qubit-dissipative resonator system

Magazzù¹,

Grifoni²

2019

J. Stat. Mech.

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We calculate the transmission spectra of a flux qubit coupled to a dissipative resonator in the ultrastrong coupling regime. Such a qubit-oscillator system constitutes the building block of superconducting circuit QED platforms. The calculated transmission of a weak probe field quantifies the response of the qubit, in frequency domain, under the sole influence of the oscillator and of its dissipative environment, an Ohmic heat bath. We find the distinctive features of the qubit-resonator system, namely two-dip structures in the calculated transmission, modified by the presence of the dissipative environment. The relative magnitude, positions, and broadening of the dips are determined by the interplay among qubit-oscillator detuning, the strength of their coupling, and the interaction with the heat bath. I. INTRODUCTION Current developments in circuit quantum electrodynamics (QED) are establishing superconducting devices as leading platforms for quantum information and simulations [1-5]. In particular, quantum optics experiments with qubit coupled to superconducting resonators are now performed in (and beyond) the so-called ultrastrong coupling (USC) regime, with the qubitresonator coupling reaching the same order of magnitude of the qubit splitting and resonator frequency [6-12]. The qubits are essentially based on superconducting circuits interrupted by Josephson junctions, the nonlinear elements that provide the anharmonicity required to singleout the two lowest energy states [13]. In the flux configuration, the qubit states are superpositions of the eigenstates of the magnetic flux operator associated to clockwise and anti-clockwise circulating supercurrents, corresponding to the two lowest energy eigenstates of a double-well potential seen by the flux coordinate. The double-well can be biased by applying an external magnetic flux and transitions between states in this qubit basis, where the states are localized arXiv:1906.05808v3 [quant-ph]

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“…In the present system, the steady states of the atom and cavity mode c are superposition states, which is different from that in the parameter regime in Figure 2c. The red curve and blue squares correspond to analytical and numerical results, which are obtained from Equation (10) and the comparison in oscillation periods, respectively. As expected, the increase in cavity decay does not destroy the oscillations due to smaller atomic dissipation.…”

Section: ρ(T) = I[ρ(t) H (T)] + κ 1 L[a S ]ρ(T) + κ 2 L[c]ρ(t) + γ Lmentioning

confidence: 99%

“…

The realization of the strong coupling regime is requisite for implementing quantum information tasks. [7][8][9] Strong coupling regime, where atom-cavity coupling strength has to be comparable or larger than atomic spontaneous emission rate γ and cavity decay rate κ, [10,11] is indispensable for experimentally investigating a manifold of quantum phenomena and implementing quantum information processing (QIP). By introducing parametric squeezing into the primary cavity, which is only virtually excited under specific parametric conditions, coupling enhancement between the atom and the auxiliary cavity is realized for appropriate squeezing parameters.

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Squeezing‐Enhanced Atom–Cavity Interaction in Coupled Cavities with High Dissipation Rates

Wang

Song

et al. 2019

Annalen der Physik

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The realization of the strong coupling regime is requisite for implementing quantum information tasks. Here, a method for enhancing the atom-field coupling in highly dissipative coupled cavities is proposed. By introducing parametric squeezing into the primary cavity, which is only virtually excited under specific parametric conditions, coupling enhancement between the atom and the auxiliary cavity is realized for appropriate squeezing parameters. This enables the system to be robust against large cavity decay and atomic spontaneous emission. The observation of vacuum Rabi oscillations show that the originally weakly coupled system can be enhanced into an effective strong coupling regime. IntroductionCavity quantum electrodynamics (QED) studies the light-matter interactions between cavity photons and quantum emitters, [1] such as Rydberg and neutral atoms, [2][3][4] superconducting qubits, [5,6] and semiconductor quantum dots (QDs). [7][8][9] Strong coupling regime, where atom-cavity coupling strength has to be comparable or larger than atomic spontaneous emission rate γ and cavity decay rate κ, [10,11] is indispensable for experimentally investigating a manifold of quantum phenomena and implementing quantum information processing (QIP). [12] Such strong interaction often requires resonators with high quality (Q) factor and small mode volume (V ) simultaneously, which is still difficult to engineer in experiments. However, flexible configurations for the cavities shift the mutual constraint between high Q and small V . It is demonstrated that by employing a coupled cavity configuration, [13] the requirement for high Q and small V for one cavity can be removed, [14] hence, effective strong coupling in highly dissipative cavity QED system is realized. On the other hand, considerable efforts have been devoted to enhance the atom-cavity coupling strength. Parametric squeezing of the

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Ultrastrongly dissipative quantum Rabi model

Cited by 43 publications

References 48 publications

Quantum electrodynamics with magnetic textures

Quantum electrodynamics with magnetic textures

Transmission spectra of an ultrastrongly coupled qubit-dissipative resonator system

Squeezing‐Enhanced Atom–Cavity Interaction in Coupled Cavities with High Dissipation Rates

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