Regimes of cavity QED under incoherent excitation: From weak to deep strong coupling

Mercurio, Alberto; Macrì, Vincenzo; Gustin, Chris; Hughes, Stephen; Savasta, Salvatore; Nori, Franco

doi:10.1103/physrevresearch.4.023048

Cited by 19 publications

(12 citation statements)

References 83 publications

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“…We demonstrate that the observation of spontaneous Raman scattering of photons from an incident field is another characteristic process of the USC regime. In particular, we show unambiguous signatures of these processes in the emission spectra of coherently-driven cQED system in the USC regime [50,51]. This result establish USC-cQED as a novel scenario where Raman Stokes and anti-Stokes photons are produced spontaneously without any vibrational degree of freedom involved.…”

mentioning

confidence: 54%

“…1(a), consisting of a single cavity mode of frequency ω c , driven by a continuous classical field of frequency ω L , and coupled to a point dipole described in the two-level system (TLS) approximation, with a transition frequency ω q . Since we will be mostly interested in describing the emission spectrum of such a system, we will resort to the sensor method developed in [52], adding an ancillary sensor qubit of frequency ω s weakly coupled to the cavity, which has been shown to also produce equivalent results to the quantum-regression theorem in the USC limit [50,51,53]. The spectrum of emission at frequency ω s will thus be proportional to the rate of emission from the sensor qubit.…”

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confidence: 99%

“…The choice of this gauge ensures a proper gauge invariance under the TLS approximation [50,56,57]. Finally, the drive Hamiltonian reads [50,51]. Further details on the derivation of this Hamiltonian are provided in the Supplemental Material [58].…”

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confidence: 99%

“…Consequently, following the approach in Refs. [51,63], we write a generalized master equation, which is valid at any light-matter coupling strength. In the limit of zero temperature, the master equation reduces to the simple form γL…”

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confidence: 99%

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Spontaneous Scattering of Raman Photons from Cavity-QED Systems in the Ultrastrong Coupling Regime

Macrì¹,

Mercurio²,

Nori³

et al. 2022

Preprint

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We show that spontaneous Raman scattering of incident radiation can be observed in cavity-QED systems without external enhancement or coupling to any vibrational degree of freedom. Raman scattering processes can be evidenced as resonances in the emission spectrum, which become clearly visible as the cavity-QED system approaches the ultrastrong coupling regime. We provide a quantum mechanical description of the effect, and show that ultrastrong light-matter coupling is a necessary condition for the observation of Raman scattering. This effect, and its strong sensitivity to the system parameters, opens new avenues for the characterization of cavity QED setups and the generation of quantum states of light.

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confidence: 54%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Spontaneous Scattering of Raman Photons from Cavity-QED Systems in the Ultrastrong Coupling Regime

Macrì¹,

Mercurio²,

Nori³

et al. 2022

Preprint

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“…Pure dephasing effects can be directly introduced by using Eq. ( 2), which provides gauge invariant expectation values, as can be easily shown [48]. However, this is not sufficient to ensure that the obtained results are physically correct.…”

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confidence: 91%

Pure Dephasing of Light-Matter Systems in the Ultrastrong and Deep-Strong Coupling Regimes

Mercurio¹,

Abo²,

Mauceri³

et al. 2022

Preprint

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Pure dephasing originates from the non-dissipative information exchange between quantum systems and environments, and plays a key-role in both spectroscopy and quantum information technology. Often pure dephasing constitutes the main mechanism of decay of quantum correlations. Here we investigate how pure dephasing of one of the components of a hybrid quantum system affects the dephasing rate of the system transitions. We find that, in turn, the interaction, in the case of a light-matter system, can significantly affect the form of the stochastic perturbation describing the dephasing of a subsystem, depending on the adopted gauge. Neglecting this issue can lead to wrong and unphysical results when the interaction becomes comparable to the bare resonance frequencies of subsystems, which correspond to the ultrastrong and deep-strong coupling regimes. We present results for two prototypical models of cavity quantun electrodynamics: the quantum Rabi and the Hopfield model.

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Photon‐Assisted Landau Zener Transitions in a Tunable Driven Rabi Dimer Coupled to a Micromechanical Resonator

Melvin,

Zheng,

Sun

et al. 2023

Adv Quantum Tech

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Employing the multiple Davydov D2 Ansätze with the time‐dependent variational principle, photon‐assisted Landau–Zener (LZ) transitions and qubit manipulation in a hybrid quantum electrodynamics device have been investigated. Modeled as a Rabi dimer, the device comprises of two interacting transmission‐line resonators, each coupled to a qubit. The qubits, driven by independent harmonic fields, are further modulated by a micromechanical resonator mimicked by a phonon mode. The impacts of two independent driving fields on the qubit dynamics are carefully examined. The energy diagram of the system and the photon number mobilization on the resonators are analyzed to explain the behavior of the LZ transitions and qubit dynamics while taking into account the influence of the single phonon mode. Results show that low phonon frequencies can alter the qubit dynamics, particularly in the absence of the driving fields, and a strong phonon coupling strength can significantly perturb the qubit dynamics, thanks to a high influx of phonon energy. Notably, only the photon frequency affects the oscillation frequency of qubit polarization. This study unveils the imperative roles that photons and phonons play in the Rabi dimer model.

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Regimes of cavity QED under incoherent excitation: From weak to deep strong coupling

Cited by 19 publications

References 83 publications

Spontaneous Scattering of Raman Photons from Cavity-QED Systems in the Ultrastrong Coupling Regime

Spontaneous Scattering of Raman Photons from Cavity-QED Systems in the Ultrastrong Coupling Regime

Pure Dephasing of Light-Matter Systems in the Ultrastrong and Deep-Strong Coupling Regimes

Photon‐Assisted Landau Zener Transitions in a Tunable Driven Rabi Dimer Coupled to a Micromechanical Resonator

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