Synchronization of qubit ensembles under optimized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>π</mml:mi></mml:math>-pulse driving

Remizov, S. V.; Shapiro, D. S.; Rubtsov, A. N.

doi:10.1103/physreva.92.053814

Cited by 7 publications

(5 citation statements)

References 35 publications

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“…( 3) [47]. For a system with inhomogeneous broadening, for example, doped rare-earth ions in crystals, the π-pulses should be implemented in a more sophisticated way [48]. The influence of inhomogeneous broadening and dephasing on phase coherence has been studied in other contexts [49] while the effect on the SPP emission may be minor because SPP modes already have broad bandwidth in the range of THz.…”

Section: Evolution Of Intermediate States-now We Turn To the Intermed...mentioning

confidence: 99%

Surface Plasmon Launching by Polariton Superradiance

Zhang

Mølmer

2019

ACS Photonics

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The condition of phase matching prohibits the transfer of excitation from free-space photons to surface plasmon polaritons (SPP). We propose and analyze a scheme that excites an ensemble of emitters in a collective state, which is phase matched with the SPP by the optical pulses used for its preparation. By a collective enhancement the ensemble, hence, emits an SPP in a well defined direction. We demonstrate the scheme by analyzing the launching of near-infrared graphene SPP. Our theory incorporates the dispersive and dissipative properties of the plasmon modes to evaluate the non-Markovian emission by the ensembles and will also be applicable for other types of surface polaritons.

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Section: Evolution Of Intermediate States-now We Turn To the Intermed...mentioning

confidence: 99%

Surface Plasmon Launching by Polariton Superradiance

Zhang

Mølmer

2019

ACS Photonics

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“…Note that by using an interplay between different Fourier components of the external electromagnetic signal, one can also achieve a synchronization of a qubit ensemble [34] despite of the unavoidable disorder in excitation energies of Josephson qubits [35].…”

Section: Toy Modelmentioning

confidence: 99%

Dynamical Lamb effect versus dissipation in superconducting quantum circuits

et al. 2016

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Superconducting circuits provide a new platform to study nonstationary cavity QED phenomena. An example of such a phenomenon is a dynamical Lamb effect which is a parametric excitation of an atom due to the nonadiabatic modulation of its Lamb shift. This effect has been initially introduced for a natural atom in a varying cavity, while we suggested its realization in a superconducting qubitcavity system with dynamically tunable coupling. In the present paper, we study the interplay between the dynamical Lamb effect and the energy dissipation, which is unavoidable in realistic systems. We find that despite of naive expectations this interplay can lead to unexpected dynamical regimes. One of the most striking results is that photon generation from vacuum can be strongly enhanced due to the qubit relaxation, which opens a new channel for such a process. We also show that dissipation in the cavity can increase the qubit excited state population. Our results can be used for the experimental observation and investigation of the dynamical Lamb effect and accompanying quantum effects.

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“…In Ref. [42] a generalized non-rectangular envelope of π-pulse was proposed. This π-pulse allows to compensate the effects of disorder in frequencies in a non-interacting qubit system.…”

Section: Modelmentioning

confidence: 99%

“…For non-interacting qubits a suppression of an inhomogeneous broadening was demonstrated for the nitrogenvacancies in diamonds [39][40][41]. We later proposed an optimized shape of the driving pulses for the broadening suppression and studied the effect of strong driving on an entanglement in the hybrid qubit-cavity system [42,43]. In the context of disordered interacting qubits it was shown that an external driving can enhance the localization effects, namely, a driven transition to the dynamical MBL phase was discovered for an engineered Floquet Hamiltonian [44].…”

Section: Introductionmentioning

confidence: 99%

Many-body synchronization of interacting qubits by engineered ac-driving

Remizov,

Shapiro,

Rubtsov

2017

Preprint

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In this work we introduce the many-body synchronization of an interacting qubit ensemble which allows one to switch dynamically from many-body-localized (MBL) to an ergodic state. We show that applying of π-pulses with altering phases, one can effectively suppress the MBL phase and, hence, eliminate qubits disorder. The findings are based on the analysis of the Loschmidt echo dynamics which shows a transition from a power-law decay to more rapid one indicating the dynamical MBL-to-ergodic transition. The technique does not require to know the microscopic details of the disorder.

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Synchronization of qubit ensembles under optimizedπ-pulse driving

Cited by 7 publications

References 35 publications

Surface Plasmon Launching by Polariton Superradiance

Surface Plasmon Launching by Polariton Superradiance

Dynamical Lamb effect versus dissipation in superconducting quantum circuits

Many-body synchronization of interacting qubits by engineered ac-driving

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