Tunable Chiral Bound States with Giant Atoms

Wang, Xin; Liu, Tao; Kockum, Anton Frisk; Li, Hongrong; Nori, Franco

doi:10.1103/physrevlett.126.043602

Cited by 127 publications

(94 citation statements)

References 84 publications

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“…While the interaction at each atom-field coupling point can still be well described by the dipole approximation, the atoms in these systems can no longer be viewed as points and the phase accumulations of photons between different coupling points should be taken into account. To date, there have been a variety of intriguing phenomena witnessed in giant-atom structures, such as frequency-dependent Lamb shifts and relaxation rates [8], decoherence-free interatomic interactions [9,[11][12][13][14], unconventional bound states [15][16][17][18][19][20][21], and phase-controlled frequency conversions [22,23]. Most recently, giant atoms have also been extended to the nonperturbative regime [24], to chiral quantum optics [12-15, 25, 26], and to synthetic dimensions [27].…”

Section: Introductionmentioning

confidence: 99%

Giant atoms with time-dependent couplings

Du,

Chen,

Zhang

et al. 2022

Preprint

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We study the decay dynamics of a two-level giant atom that is coupled to a waveguide with timedependent coupling strengths. In the non-Markovian regime where the retardation effect cannot be ignored, we show that the dynamics of the atom depends on the atom-waveguide coupling strengths at an earlier time. This allows to tailor the decay dynamics of the giant atom and, with appropriate coupling modulation, to realize a stationary population revival. Moreover, we demonstrate the possibility of simulating the quantum Zeno and quantum anti-Zeno effects in the giant-atom model with periodic coupling quenches. These results have potential applications in quantum information processing and quantum network engineering.

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Section: Introductionmentioning

confidence: 99%

Giant atoms with time-dependent couplings

Du,

Chen,

Zhang

et al. 2022

Preprint

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“…In the past few years, nonchiral giant atoms have been well investigated [54], which demonstrated a series of intriguing interference effects such as frequency-dependent Lamb shift and relaxation rate [55], decoherence-free interatomic interactions [56][57][58], and oscillating bound states [59]. Most recently, the concept of chiral quantum optics has also been brought to giant-atom structures [60][61][62], which shows the possibility of combining the advantages of the two paradigms. Here, we study the nonreciprocal singlephoton frequency conversion of the chiral Λ-type giant atom in both the Markovian and non-Markovian regimes, which are defined depending on whether the propagation time of photons between different atom-waveguide coupling points is negligible or not.…”

Section: Introductionmentioning

confidence: 99%

Nonreciprocal frequency conversion with chiral $Λ$-type atoms

Du,

Chen,

2021

Preprint

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In this paper, we begin with a model of a Λ-type atom whose both transitions are chirally coupled to a waveguide and then extend the model to its giant-atom version. We investigate the singlephoton scatterings of the giant-atom model in both the Markovian and non-Markovian regimes. It is shown that the chiral atom-waveguide couplings enable nonreciprocal, reflectionless, and efficient frequency conversion, while the giant-atom structure introduces intriguing interference effects to the scattering behaviors, such as ultra-narrow scattering windows. The chiral giant-atom model exhibits quite different scattering spectra in the two regimes and, in particular, demonstrates non-Markovicity induced nonreciprocity under specific conditions. These phenomena can be understood from the effective detuning and decay rate of the giant-atom model. Our results have potential applications in integrated photonics and quantum network engineering.

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“…Usually, the photon bound state is exponentially localized and isotropic around the emitter, which limits the form of dipole-dipole interactions [3,4]. However, through properly modifying the photonic bath, photon bound states can be anisotropic [8][9][10][11], power-law scaling [6,7,12], and even phase tunable [13][14][15][16]. These special bound states can be used to study more exotic many-body phases.…”

Section: Introductionmentioning

confidence: 99%

Chiral spin-phonon bound states and spin-spin interactions with phononic lattices

Dong¹,

Shen²,

Gao³

et al. 2021

Preprint

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Designing unconventional interactions between single phonons and spins is fascinating for its applications in quantum phononics. Here, we propose a reliable scheme for coupling spins and phonons in phononic dimer and trimer lattices, with the combination of solid-state defects and diamond phononic (optomechanical) crystals. The dimer and trimer lattices used are an array of coupled phononic cavities with spatially modulated hopping rates. We predict a series of unconventional sound-matter interaction phenomena in this hybrid quantum system. In the dimer lattice, we show the formation of chiral spin-phonon bound states and topology-dependent phononic collective radiation. While in the trimer lattice, chiral bound states still exist and the spin relaxation is sublattice-dependent. The chiral bound states existed in both types of lattices are robust to large amount of disorder, which can mediate chiral and robust spin-spin interactions. This work provides a promising platform for phonon-based quantum information processing and quantum simulation.

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Tunable Chiral Bound States with Giant Atoms

Cited by 127 publications

References 84 publications

Giant atoms with time-dependent couplings

Giant atoms with time-dependent couplings

Nonreciprocal frequency conversion with chiral $Λ$-type atoms

Chiral spin-phonon bound states and spin-spin interactions with phononic lattices

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