Engineering and Harnessing Giant Atoms in High-Dimensional Baths: A Proposal for Implementation with Cold Atoms

González-Tudela, Alejandro; Muñoz, Carlos Sánchez; Cirac, J. I.

doi:10.1103/physrevlett.122.203603

Cited by 91 publications

(42 citation statements)

References 82 publications

(126 reference statements)

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“…Striking effects have been found as a consequence of this, e.g., frequency-dependent relaxation rate and Lamb shift of a giant atom [25][26][27], and decoherence-free interaction between multiple giant atoms [26,28]. The giantatom scheme has recently been extended to higher dimensions with cold atoms [29] and constitutes an exciting new paradigm in quantum optics [10,12,29], where much remains to explore.…”

Section: Introductionmentioning

confidence: 99%

Oscillating bound states for a giant atom

Guo

Kockum

Marquardt

et al. 2020

Phys. Rev. Research

144

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We investigate the relaxation dynamics of a single artificial atom interacting, via multiple coupling points, with a continuum of bosonic modes (photons or phonons) in a one-dimensional waveguide. In the non-Markovian regime, where the traveling time of a photon or phonon between the coupling points is sufficiently large compared to the inverse of the bare relaxation rate of the atom, we find that a boson can be trapped and form a stable bound state. As a key discovery, we further find that a persistently oscillating bound state can appear inside the continuous spectrum of the waveguide if the number of coupling points is more than two since such a setup enables multiple bound modes to coexist. This opens up prospects for storing and manipulating quantum information in larger Hilbert spaces than available in previously known bound states.

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Section: Introductionmentioning

confidence: 99%

Oscillating bound states for a giant atom

Guo

Kockum

Marquardt

et al. 2020

Phys. Rev. Research

144

View full text Add to dashboard Cite

show abstract

“…All experiments with giant atoms so far have taken place in 1D geometries at microwave frequencies and used superconducting qubits. A recent theory proposal (González-Tudela et al 2019) shows how giant atoms instead could be implemented in higher dimensions on another platform for quantum-optics simulation: cold atoms in optical lattices. Here, one would use atoms with two internal states, each of which couples to a different optical lattice, realized by counter-propagating lasers.…”

Section: Cold Atoms In Optical Latticesmentioning

confidence: 99%

“…In one state, the atom mimics a photon moving in a lattice; in the other state, the atom mimics an atom trapped in a specific site. By rapidly modulating the relative positions of the two lattices, it is possible to engineer an effective interaction where the atomic state couples to the photonic state at multiple points (González-Tudela et al 2019). It may be possible to achieve a similar effect with superconducting qubits coupled to several sites in a 2D lattice of superconducting resonators.…”

Section: Cold Atoms In Optical Latticesmentioning

confidence: 99%

Quantum Optics with Giant Atoms—the First Five Years

Kockum

2020

Mathematics for Industry

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In quantum optics, it is common to assume that atoms can be approximated as point-like compared to the wavelength of the light they interact with. However, recent advances in experiments with artificial atoms built from superconducting circuits have shown that this assumption can be violated. Instead, these artificial atoms can couple to an electromagnetic field at multiple points, which are spaced wavelength distances apart. In this chapter, we present a survey of such systems, which we call giant atoms. The main novelty of giant atoms is that the multiple coupling points give rise to interference effects that are not present in quantum optics with ordinary, small atoms. We discuss both theoretical and experimental results for single and multiple giant atoms, and show how the interference effects can be used for interesting applications. We also give an outlook for this emerging field of quantum optics.

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“…Another phenomenon for giant atoms in the non-Markovian regime is creation of bound states [13,14]. Besides one dimensional geometries based on superconducting circuits, the giant-atom scheme could be realized in higher dimensions with cold atoms in optical lattices [15]. The interactions between a giant atom and bosonic modes in a nonlinear waveguide or a topological waveguide are also investigated [16,17].…”

Section: Introductionmentioning

confidence: 99%

Coherent single-photon scattering spectra for a giant-atom waveguide-QED system beyond dipole approximation

Cai,

Jia

2022

Preprint

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We investigate the single-photon scattering spectra of a giant atom coupled to a one dimensional waveguide via multiple connection points or a continuous coupling region. Using a full quantum mechanical method, we obtain the general analytic expressions for the single-photon scattering coefficients, which are valid in both the Markovian and the non-Markovian regimes. We summarize the influences of the non-dipole effects, mainly caused by the phases accumulated by photons traveling between coupling points, on the scattering spectra. We find that under the Markovian limit, the phase decay is detuning-independent, resulting in Lorentzian lineshapes characterized by the Lamb shifts and the effective decay rates. While in the non-Markovian regime, the accumulated phases become detuning-dependent, giving rise to non-Lorentzian lineshapes, characterized by multiple side peaks and total transmission points. Another interesting phenomenon in the non-Markovian regime is generation of broad photonic band gap by a single giant atom. We further generalize the case of discrete coupling points to the continuum limit with atom coupling to the waveguide via a continuous area, and analyze the scattering spectra for some typical distributions of coupling strength.

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Engineering and Harnessing Giant Atoms in High-Dimensional Baths: A Proposal for Implementation with Cold Atoms

Cited by 91 publications

References 82 publications

Oscillating bound states for a giant atom

Oscillating bound states for a giant atom

Quantum Optics with Giant Atoms—the First Five Years

Coherent single-photon scattering spectra for a giant-atom waveguide-QED system beyond dipole approximation

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