Nonreciprocal frequency conversion with chiral 
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-type atoms

Du, Lei; Chen, Yao-Tong; Li, Yong

doi:10.1103/physrevresearch.3.043226

Cited by 42 publications

(21 citation statements)

References 80 publications

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“…4(a)]. Additionally, the emitter is assumed to be of giant atom form [60][61][62][63][64][65][66][67][68][69], which couples to the waveguide at two points x ± of channel A (or B), as depicted in Fig. 4(b).…”

Section: Periodical Interference Behavior Modulated By Giant Emitter'...mentioning

confidence: 99%

“…Due to spinmomentum locking, the emitter chirally dissipates almost all its energy into one direction of the waveguide. Second, the emitter is considered as giant atom form, and couples to the waveguide at multiple sites [60][61][62][63][64][65][66][67][68][69]. Given that emitters' frequency is below two degenerate minima points induced by the spin-orbit coupling, the bound states will be periodically modulated by giant atom's size due to quantum interference.…”

Section: Introductionmentioning

confidence: 99%

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Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Wang,

Gao,

et al. 2022

Preprint

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We propose a novel quantum electrodynamics (QED) platform where quantum emitters interact with a Hofstadter-ladder waveguide. We demonstrate several intriguing phenomena stemming from the exotic dispersion relation and vacuum mode properties led by the effective spin-orbit coupling, which have no analog in other QED setups. First, by assuming emitter's frequency to be resonant with the lower band, we find that the spontaneous emission is chiral with most photonic field decaying unidirectionally. Both numerical and analytical results indicate that the Hofstadter-ladder waveguide can be engineered as a well-performed chiral quantum bus. Second, the dynamics of emitters of giant atom form is explored by considering their frequencies below the lower band. Due to quantum interference, we find that both the emitter-waveguide interaction and the amplitudes of bound states are periodically modulated by giant emitter's size. The periodical length depends on the positions of energy minima points induced by the spin-orbit coupling. Last, we consider the interaction between two giant emitters mediated by bound states, and find that their dipole-dipole interaction vanishes (is enhanced) when maximum destructive (constructive) interference happens.

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Section: Periodical Interference Behavior Modulated By Giant Emitter'...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Wang,

Gao,

et al. 2022

Preprint

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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%

“…In fact, such effects are ubiquitous and of course should be considered if the propagation time of photons between different coupling points is comparable to or even larger than the lifetime of the atom [6]. In this case, both the dynamic evolutions [6,16,28,29] and the scattering properties [23,30,31] of the giant atom exhibit significant non-Markovian features that have no counterparts in the Markovian regime, such as bound states that oscillate persistently between the giant atom and the one-dimensional continuum [16] and non-Markovianity induced nonreciprocity [23]. Moreover, non-Markovian retardation effects have also been well studied in systems featuring a semi-infinite waveguide, where a small atom placed in front of the waveguide end can be mapped into a giant atom with two identical coupling strengths [32][33][34][35][36].…”

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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“…Recently, much attention has been paid to the study of photon scattering in giant-atom waveguide-QED systems [58,[67][68][69][70]. In these systems, giant atoms can be engineered to couple with the waveguide at multiple points with large separation distance, and hence the dipole approximation is no longer valid.…”

Section: Introductionmentioning

confidence: 99%

Single-photon scattering in a giant-molecule waveguide-QED system

Yin,

Liu,

Huang

et al. 2022

Preprint

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We study the coherent single-photon scattering in a one-dimensional waveguide coupled to a giant artificial molecule consisting of two coupled giant atoms. Since each giant atom couples to the waveguide via two coupling points, the couplings of the molecule with the waveguide have three different coupling configurations: the separated-, braided-, and nested-coupling cases. We obtain the exact expressions of the single-photon transmission and reflection amplitudes with the real-space approach. It is found that the behavior of the scattering spectra depends on the phase shift between two neighboring coupling points, the coupling configuration, and the coupling between the two giant atoms. Concretely, we study the photon scattering in both the Markovian and non-Markovian regimes, in which the photon propagating time between two neighboring coupling points is neglected and considered, respectively. Under the Markovian limit, the asymmetric Fano lineshapes in different coupling configurations of the giant-molecule waveguide-QED system can be obtained by choosing proper phase shift, and the transmission window can be adjusted by the coupling strength between the two giant atoms in these three coupling configurations. In particular, multiple reflection peaks and dips in these configurations are revived in the non-Markovian regime. This work will pave the way for the study of controllable singlephoton devices based on the giant-molecule waveguide-QED systems.

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Nonreciprocal frequency conversion with chiral Λ -type atoms

Cited by 42 publications

References 80 publications

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Giant atoms with time-dependent couplings

Single-photon scattering in a giant-molecule waveguide-QED system

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