Interaction of Phase-Modulated Femtosecond Pulses with an Optically Dense Quasi-Resonant Medium of Rubidium Vapors

Багаев, С. Н.; Preobrazhenskaya, A. A.; Timofeev, N. A.; Pastor, A. A.; Mekhov, Igor B.; Chekhonin, I. A.; Serdobintsev, P. Yu.; Egorov, V. S.; Chekhonin, M. A.; Mashko, A. M.

doi:10.1134/s0030400x1811005x

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…(1.48) gives a two-satellite contour (1.51) reflecting normalmode splitting of two oscillators ⟨𝑎 0,1 ⟩ coupled through atoms. Here, two strongly coupled oscillators are the two light modes, which is different from the usual cavity QED normal-mode splitting (vacuum Rabi splitting), where the two coupled oscillators are light and near-resonant atoms [101][102][103][104][105][106][107][108][109][110]. This was observed [111] for collective strong coupling, i.e., the splitting 𝑈 10 ⟨ D10 ⟩ exceeding 𝜅.…”

Section: Mapping the Full Distribution Function Of A Quantum Gasmentioning

confidence: 99%

Quantum optics of ultracold quantum gases: open systems beyond dissipation (habilitation thesis)

Mekhov¹

2022

Preprint

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1 Both quantum optics and physics of ultracold quantum gases are well-established fields of modern quantum science forming the basis for emerging quantum technologies, quantum information, and quantum artificial intelligence. Nevertheless, until recently the interaction between them was practically absent: in all experiments and in the majority of theories of ultracold gases, the quantum nature of light plays no role. In this work, we consider systems and phenomena, where the quantumness of both light and ultracold matter is equally important. Therefore, quantum optics of ultracold quantum gases describes the ultimate quantum level of light-matter interaction predicting phenomena unobtainable in standard problems of ultracold atoms trapped in prescribed optical potentials, e.g., optical lattices.First, we show that light can serve as a quantum nondemolition (QND) probe of the atomic many-body phases: the phases can be distinguished by measuring their statistical properties from nontrivial correlation functions to full distribution functions of many-body variables (we give examples for bosons, fermions, and dipolar molecules). We demonstrate that light scattering is not only sensitive to the on-site atomic densities, but also to the matter-field interference at its shortest possible distance in an optical lattice. Second, we prove that the backaction of quantum measurements constitutes a novel source of competitions in many-body systems, which is especially pronounced, when the measurements are not QND ones. This leads to a plethora of novel phenomena: macroscopic oscillations of multipartite entangled matter modes, measurementinduced protection and break-up of fermion pairs, generation of antiferromagnetic orders, novel long-range pair correlated tunnelling and entanglement beyond the standard Hubbard models. We prove that the feedback control can induce phase transitions in quantum systems and tune their critical exponents and universality class. Third, the quantization of optical trapping potential (quantum optical lattices) leads to novel many-body phases of ultracold atoms, including both the density orders (e.g. lattice supersolids and density waves) and orders of matter-field coherences (e.g. bond orders such as superfluid and supersolid dimers, trimers, etc.)The general results applicable beyond physics of ultracold atoms are the following. We extend the paradigm of feedback control from the quantum state control to the control of phase transitions, including tuning their universality class. We present the backaction of quantum measurements as a novel source of competitions in many-body physics. We merge the paradigms of quantum Zeno dynamics and non-Hermitian physics, and introduce a novel type of quantum Zeno phenomena with Raman-like transitions well beyond the standard concept of Zeno dynamics. We propose a concept of quantum simulators based on the collective light-matter interaction with the interplay of long-and short-range interactions. Our models can be applied to other arrays of quantum particles...

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Section: Mapping the Full Distribution Function Of A Quantum Gasmentioning

confidence: 99%

Quantum optics of ultracold quantum gases: open systems beyond dissipation (habilitation thesis)

Mekhov¹

2022

Preprint

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Atom femtosecond optical trap based on spectrally filtered laser radiation

et al. 2020

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We have examined the use of alkali metal (rubidium) vapour for spectral filtering of broadband pulsed laser light that is used to produce a femtosecond pulsed optical dipole trap. It has been shown that, even at large detuning of the centre emission frequency from the frequency of atomic transitions, spectral components present in the wings of the laser emission line are capable of heating localised atoms, thus reducing their lifetime in the atomic trap. Using atomic vapour for filtering the laser emission spectrum, we have suppressed its spectral components resulting in heating. This has made it possible to increase the lifetime of atoms in the pulsed optical dipole trap to a value comparable to their lifetime in an optical trap formed by narrow-band cw laser light.

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Radiation of a Resonant Medium Excited by a Periodically Phase-Modulated Laser in the Regime of Strong Coupling between the Field and the Matter

Архипов

Egorov

et al. 2019

Opt. Spectrosc.

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Interaction of Phase-Modulated Femtosecond Pulses with an Optically Dense Quasi-Resonant Medium of Rubidium Vapors

Cited by 3 publications

References 9 publications

Quantum optics of ultracold quantum gases: open systems beyond dissipation (habilitation thesis)

Quantum optics of ultracold quantum gases: open systems beyond dissipation (habilitation thesis)

Atom femtosecond optical trap based on spectrally filtered laser radiation

Radiation of a Resonant Medium Excited by a Periodically Phase-Modulated Laser in the Regime of Strong Coupling between the Field and the Matter

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