Giant atoms with time-dependent couplings

Abstract

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.

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

“…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).…”

“…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.…”

Nonreciprocal waveguide-QED for spinning cavities with multiple coupling points

“…However, an emergent class of artificial atoms, called giant atoms, break down this dipole approximation. Their sizes are comparable to the wavelength of photons (phonons) interacted [23][24][25][26][27][28][29][30][31][32][33][34][35]. Recent experiments have demonstrated that superconducting artificial atoms can be successfully coupled with propagating surface acoustic waves at several points [36][37][38].…”