Beyond spontaneous emission: Giant atom bounded in the continuum

Guo, Shangjie; Wang, Yidan; Purdy, Thomas; Taylor, Jacob M.

doi:10.1103/physreva.102.033706

Cited by 66 publications

(32 citation statements)

References 40 publications

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“…These oscillating bound states do not decay into the waveguide, but the energy oscillates persistently between the atom and the waveguide modes in-between the outermost coupling points of the atom. This result appears connected to that of Ask et al (2019a) discussed above, and similar results have been obtained in Guo et al (2020).…”

Section: One Giant Atom With Time Delaysupporting

confidence: 91%

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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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Section: One Giant Atom With Time Delaysupporting

confidence: 91%

“…Four theoretical studies (Guo et al 2017;Ask et al 2019a;Guo et al , 2020 have explored this regime (the latter three considering more than two coupling points). In Ask et al (2019a), it was shown that τ = 1 constitutes a sharp border for when time-delay effects become visible.…”

Section: One Giant Atom With Time Delaymentioning

confidence: 99%

Quantum Optics with Giant Atoms—the First Five Years

Kockum

2020

Mathematics for Industry

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“…2(a)] the decay is limited. This result stems from the existence of a bound state in the continuum [39], which is a stationary solution to the differential-delayed equation (12). It should be noted that the existence of a bound state in the continuum is an exact result for shortrange coupling, i.e.…”

mentioning

confidence: 95%

“…For an excited atom emitting in a featureless continuum of electromagnetic modes in the vacuum state, the resulting process of spontaneous emission is well described by an exponential decay of atomic excitation to its ground state associated to an irreversible emission of a photon, according to the Weisskopf-Wigner theory [2].This picture, however, is challenged when considering spontaneous decay of ′ giant ′ atoms (GAs), i.e. artificial quantum emitters whose dimension is larger than the wavelength of the emitted photon [3][4][5][6][7][8][9][10][11][12][13]. In this case the time it takes for light to pass a single atom cannot be neglected, giving rise to strong non-Markovian dynamics at the single atom level even thought the atom-field coupling is weak.…”

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confidence: 99%

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Photonic simulation of giant atom decay

Longhi

2020

Opt. Lett.

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Spontaneous emission of an excited atom in a featureless continuum of electromagnetic modes is a fundamental process in quantum electrodynamics associated with an exponential decay of the quantum emitter to its ground state accompanied by an irreversible emission of a photon. However, such a simple scenario is deeply modified when considering a ′ giant ′ atom, i.e an atom whose dimension is larger than the wavelength of the emitted photon. In such an unconventional regime, non-Markovian effects and strong deviations from an exponential decay are observed owing to interference effects arising from non-local light-atom coupling. Here we suggest a photonic simulation of non-Markovian giant atom decay, based on light escape dynamics in an optical waveguide non-locally-coupled to a waveguide lattice. Major effects such as non-exponential decay, enhancement or slowing down of the decay, and formation of atom-field dark states can be emulated in this system.

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