Optical multi-Fano-like phenomena with giant atom–waveguide systems

Single-photon scattering and quantum entanglement of two giant atoms with azimuthal angle differences in a waveguide system

“…However, an emitter called giant atom, [29] which can couple to a waveguide at multiple separate connecting points, has attracted intensive attention recently since the atomic size is no longer negligible and ever parallel with the travelling-field wavelength. In contrast to single-point couplings of the familiar small atoms, the multiple-point couplings of the giant atoms will generate additional interference effects, and thus result in numerous exotic phenomena such as multi-frequency Fano resonance, [30][31][32] tunable nonreciprocal scattering, [33][34][35] phase-modulated Autler-Townes splitting, [36] and dynamical spontaneous emission. [37] Surface plasmon transport in one-dimensional cylindrical nanowire waveguide has also attracted much attention in the nanophotonic field in recent years, owing to its great similarity to light transmission in usual dielectric optical components.…”

Asymmetric Markovian control of quantum entanglement

“…Quantum technology is amazing due to theemployment of non-classical phenomena in the quantum regime, such as entanglement, which is termed the characteristic trait of quantum mechanics by Schrödinger.If the quantum state of a particle in agroup cannot bedescribed independently of the state of the others, then those are entangled together even if far apart.The more entanglement between distant atoms, the more it is interested in quantum applications such as quantum communication, computation, high-precision spectroscopy, and cryptography [17]. Many efforts have been devoted to entangled states creation [18][19][20], detection [21], avoiding deterioration [22,23], and enhancement of entanglements [24]. Some efforts employ feedback to manipulate the process of generating entangled states [25] while others attempt to stabilize them [26].…”