Quantum coherence and speed limit in the mean-field Dicke model of superradiance

Rossatto, D. Z.; Pires, Diego Paiva; Paula, F. M.; Neto, O. P. de Sá

doi:10.1103/physreva.102.053716

Cited by 19 publications

(12 citation statements)

References 102 publications

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“…The time-resolved ITS spectroscopy provides the spectral information as well as decoherence of vibrational states with a femtosecond temporal resolution. The decoherence time of certain states is important and fundamental in many fields, such as alignment of molecules, , remote atmospheric lasing, , quantum lithography, , superradiance, − and quantum information . In principle, the ITS technique can be extended to study chemical reactions, molecular structure, environmental dynamics, phonon dynamics, and phonon–exciton coupling in low-dimensional materials.…”

Section: Discussionmentioning

confidence: 99%

Femtosecond Time-Resolved Infrared-Resonant Third-Order Sum-Frequency Spectroscopy

Wang

Shen

et al. 2021

ACS Photonics

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We demonstrate a coherent vibrational spectroscopy based on molecular infrared (IR)-active resonance. We apply two femtosecond pulses (one in near-IR and the other in mid-IR) to generate the femtosecond time-resolved IR-resonant third-order sumfrequency signal. The mid-IR pulse is tuned to be resonant with molecular vibrations. This experimental configuration converts the IR light into a visible signal and exhibits high sensitivity to the vibrational mode of the molecule. The technique can be applied to acquire chemical information on various biological samples, including living tissues in their natural water-rich state. This approach can also be used to study the dynamics of IRactive vibrational modes, that is, measure the decoherence time.

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Section: Discussionmentioning

confidence: 99%

Femtosecond Time-Resolved Infrared-Resonant Third-Order Sum-Frequency Spectroscopy

Wang

Shen

et al. 2021

ACS Photonics

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“…The QSL on coherence applies to both coherence generation and coherence degradation processes. In particular, our bound in (22) can answer how fast a system undergoes decoherence. For any completely dephasing process, the above bound ( 22) is interpreted as the speed limit of decoherence, which means the minimum time required for a coherent state to become an incoherent state.…”

Section: Quantum Speed Limit For Coherencementioning

confidence: 99%

“…In figure 2, we plot the bound (22) for finite time duration. The plot shows that the bound (22) is not tight as expected (see appendix C).…”

Section: Quantum Speed Limit For Coherencementioning

confidence: 99%

Quantum speed limits for information and coherence

2022

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The quantum speed limit indicates the maximal evolution speed of the quantum system. In this work, we determine speed limits on the informational measures, namely the von Neumann entropy, maximal information, and coherence of quantum systems evolving under dynamical processes. These speed limits ascertain the fundamental limitations on the evolution time required by the quantum systems for the changes in their informational measures. Erasing of quantum information to reset the memory for future use is crucial for quantum computing devices. We use speed limit on the maximal information to obtain minimum time required to erase the information of quantum systems via some quantum processes of interest.

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“…In this section we study how an array of weakly anharmonic oscillators, such as transmons, behaves under the influence of the collective electromagnetic environment of a waveguide, and compare the results to the widely studied qubit case, especially the Dicke model [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] and to the case of an array of harmonic oscillators.…”

Section: Collective Bosonic Many-body Effectsmentioning

confidence: 99%

Collective bosonic effects in an array of transmon devices

et al. 2022

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Multiple emitters coherently interacting with an electromagnetic mode give rise to collective effects such as correlated decay and coherent exchange interaction, depending on the separation of the emitters. By diagonalizing the effective non-Hermitian many-body Hamiltonian we reveal the complex-valued eigenvalue spectrum encoding the decay and interaction characteristics. We show that there are significant differences in the emerging collective effects for an array of interacting anharmonic oscillators compared to those of two-level systems and harmonic oscillators. The bosonic decay rate of the most superradiant state increases linearly as a function of the filling factor and exceeds that of two-level systems in magnitude. Furthermore, with bosonic systems, dark states are formed at each filling factor. These are in strong contrast with two-level systems, where the maximal superradiance is observed at half-filling and with larger filling factors superradiance diminishes and no dark states are formed. As an experimentally relevant setup of bosonic waveguide QED, we focus on arrays of transmon devices embedded inside a rectangular waveguide. Specifically, we study the setup of two transmon pairs realized experimentally in Zanner et al. [Nat. Phys. 18, 538 (2022)] and show that it is necessary to consider transmons as bosonic multilevel emitters to accurately recover correct collective effects for the higher excitation manifolds.

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Quantum coherence and speed limit in the mean-field Dicke model of superradiance

Cited by 19 publications

References 102 publications

Femtosecond Time-Resolved Infrared-Resonant Third-Order Sum-Frequency Spectroscopy

Femtosecond Time-Resolved Infrared-Resonant Third-Order Sum-Frequency Spectroscopy

Quantum speed limits for information and coherence

Collective bosonic effects in an array of transmon devices

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