Waveguide quantum electrodynamics with superconducting artificial giant atoms

Kannan, Bharath; Ruckriegel, Max J.; Campbell, Daniel; Kockum, Anton Frisk; Braumüller, Jochen; Kim, David K.; Kjærgaard, Morten; Krantz, Philip; Melville, Alexander; Niedzielski, Bethany; Vepsäläinen, Antti; Winik, Roni; Yoder, Jonilyn; Nori, Franco; Orlando, Terry P.; Gustavsson, Simon; Oliver, William

doi:10.1038/s41586-020-2529-9

Cited by 243 publications

(162 citation statements)

References 34 publications

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“…Such a giant-atom structure can also be realized in a more conventional circuit-quantumelectrodynamics (circuit-QED) experiment by coupling a single Xmon [24], a version of the transmon, to a meandering coplanar waveguide (CPW) as sketched in Fig. 1 (right inset) [25][26][27]. Since the distance between coupling points can be (much) longer than the characteristic wavelength of the bath, it is necessary to consider the phase difference between these coupling points.…”

Section: Introductionmentioning

confidence: 99%

“…Since the distance between coupling points can be (much) longer than the characteristic wavelength of the bath, it is necessary to consider the phase difference between these coupling points. 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%

“…Right: an Xmon qubit coupled capacitively to a meandering microwave CPW at multiple points. system can be implemented in at least two different experimental schemes: a transmon qubit with multiple interdigital transducers (IDTs) coupled to SAWs through piezoelectric effects [14][15][16][17] or an Xmon qubit [24][25][26][27] with multiple arms capacitively coupled to a coplanar waveguide.…”

Section: Introductionmentioning

confidence: 99%

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Oscillating bound states for a giant atom

Guo

Kockum

Marquardt

et al. 2020

Phys. Rev. Research

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141

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oscillating bound states for a giant atom

Guo

Kockum

Marquardt

et al. 2020

Phys. Rev. Research

Self Cite

141

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“…Eq. (43)]. Using (25), one can check that this always yieldsĤ vac = 0 in the serial and nested topologies (see Fig.…”

Section: Decoherence-free Hamiltonians With Giant Atomsmentioning

confidence: 99%

“…In this work we present a general theory of the CM-based description of quantum optics in the case of many emitters. We allow each of these to generally couple to the field at many coupling points so as to encompass systems such as the so-called giant atoms [40,41], which can now be experimentally implemented and operated [42,43], or bosonic oscillators/atomic ensembles coupled to one-dimensional FIG. 1.…”

Section: Introductionmentioning

confidence: 99%

Collisional picture of quantum optics with giant emitters

Cilluffo

Carollo

Lorenzo

et al. 2020

Phys. Rev. Research

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The effective description of the weak interaction between an emitter and a bosonic field as a sequence of twobody collisions provides a simple intuitive picture compared to traditional quantum optics methods as well as an effective calculation tool of the joint emitter-field dynamics. Here this collisional approach is extended to many emitters (atoms or resonators), each generally interacting with the field at many coupling points (giant emitter). In the regime of negligible delays, the unitary describing each collision in particular features a contribution of a chiral origin resulting in an effective Hamiltonian. The picture is applied to derive a Lindblad master equation (ME) of a set of giant atoms coupled to a (generally chiral) waveguide field in an arbitrary white-noise Gaussian state, which condenses into a single equation and extends a variety of quantum optics and waveguide QED MEs. The effective Hamiltonian and jump operators corresponding to a selected photodetection scheme are also worked out.

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Unconventional Light‐Matter Interactions Between Giant Atoms and Structured Baths with Next‐Nearest‐Neighbor Couplings

Wang,

Huang,

Zhang

et al. 2024

Annalen der Physik

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In this paper, the unconventional light‐matter interactions between giant atoms and structured baths (i.e., lattices) are studied with either Hermitian or non‐Hermitian next‐nearest‐neighbor coupling terms. Essentially different dynamics of the atoms and the propagating field in the Hermitian and non‐Hermitian cases is revealed, which can be further engineered by tuning parameters such as the atomic transition frequency and the (synthetic) magnetic field associated to the coupling terms. The next‐nearest‐neighbor couplings play an important role in controlling the emission direction and the field distribution in the lattice, thus providing opportunities for tailoring exotic dipole–dipole interactions. The results in this paper have potential applications in, e.g., engineering unconventional quantum networks and simulating quantum many‐body systems.

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Waveguide quantum electrodynamics with superconducting artificial giant atoms

Cited by 243 publications

References 34 publications

Oscillating bound states for a giant atom

Oscillating bound states for a giant atom

Collisional picture of quantum optics with giant emitters

Unconventional Light‐Matter Interactions Between Giant Atoms and Structured Baths with Next‐Nearest‐Neighbor Couplings

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