15 research outputs found
Dressed bound states at chiral exceptional points
Atom-photon dressed states are a basic concept of quantum optics. Here, we
demonstrate that the non-Hermiticity of open cavity can be harnessed to form
the dressed bound states (DBS) and identify two types of DBS, the vacancy-like
DBS and Friedrich-Wintgen DBS, in a microring resonator operating at a chiral
exceptional point. With the analytical DBS conditions, we show that the
vacancy-like DBS occurs when an atom couples to the standing wave mode that is
a node of photonic wave function, and thus is immune to the cavity dissipation
and characterized by the null spectral density at cavity resonance. While the
Friedrich-Wintgen DBS can be accessed by continuously tuning the system
parameters, such as the atom-photon detuning, and evidenced by a vanishing Rabi
peak in emission spectrum, an unusual feature in the strong-coupling
anticrossing. We also demonstrate the quantum-optics applications of the
proposed DBS. Our work exhibits the quantum states control through
non-Hermiticity of open quantum system and presents a clear physical picture on
DBS at chiral exceptional points, which holds great potential in building
high-performance quantum devices for sensing, photon storage, and nonclassical
light generation.Comment: 13 pages, 5 figure
Abstract generalized vector quasi-equilibrium problems in noncompact Hadamard manifolds
Abstract This paper deals with the abstract generalized vector quasi-equilibrium problem in noncompact Hadamard manifolds. We prove the existence of solutions to the abstract generalized vector quasi-equilibrium problem under suitable conditions and provide applications to an abstract vector quasi-equilibrium problem, a generalized scalar equilibrium problem, a scalar equilibrium problem, and a perturbed saddle point problem. Finally, as an application of the existence of solutions to the generalized scalar equilibrium problem, we obtain a weakly mixed variational inequality and two mixed variational inequalities. The results presented in this paper unify and generalize many known results in the literature
Fano effect induced giant and robust enhancement of photon correlations in cavity QED systems
Fano effect arising from interference between two dissipation channels to the
radiation continuum enables to tune the photon statistics. Understanding the
role of Fano effect and exploiting to achieve strong photon correlations are of
both fundamental and applied significance. We present an analytical description
of Fano-enhanced photon correlations based on cavity quantum electrodynamics to
show that, the Fano effect in atom-cavity systems can improve the degree of
antibunching by over four orders of magnitude. The enhancement factors and the
optimal conditions are explicitly given, and found related to the Fano
parameter . Remarkably, the Fano enhancement manifests robustness against
the decoherence processes, and can survive in the weak coupling regime. We
expect our work to provide insight in tuning the photon statistics through Fano
effect, which offers a new route to enhance the photon correlations, as well as
the possibility of generating nonclassical light in a wider diversity of
systems without the need of strong light-matter interaction.Comment: 6 pages, 3 figure
Single-photon blockade in quasichiral atom-photon interaction: Simultaneous high purity and high efficiency
We investigate the single-photon blockade (1PB) in the quasichiral regime of
atom-photon interaction that mediates via dissipative environment, where the
effective atom-photon interaction is asymmetrical but achiral. The synthetic
magnetic current in the closed-loop coupling breaks down the reciprocity of
atom-photon interaction, resulting in an asymmetrical and even completely
unidirectional effective coupling between two selected quantum states. As an
example, we couple the single-atom cavity-QED (cQED) system to a strongly
dissipative auxiliary cavity. We find that in the quasichiral regime, the
unconventional photon blockade (UPB) always incorporates with the conventional
photon blockade (CPB) in the condition of maximum chirality. Furthermore, we
show that 1PB in the quasichiral regime combines the advantages of UPB and CPB,
demonstrating the perfect single-photon purity, higher efficiency, smooth time
dynamics as well as lower requirement of modes coupling to achieve UPB. Our
work paves the way for 1PB towards practical applications and reveals the
intriguing quantum-optics phenomena in the quasichiral light-matter
interaction.Comment: 9 pages, 6 figure
Transmission of recombinant enterovirus A76 (EV-A76) in Xinjiang Uighur autonomous region of China
Enterovirus 76 (EV-A76) is a serotype of enterovirus A and has been rarely reported. In this paper, we present the genetic characteristics of 15 EV-A76 isolates reported to circulate in the Xinjiang Uighur autonomous region of China in 2011. Sequence analysis revealed that all Chinese EV-A76 isolates had high similarity (> 98.3%) in the VP1 region, and five Chinese EV-A76 isolates were selected for whole genome sequencing based on VP1 nucleotide divergence. Similarity plots and boot-scanning analyses revealed frequent intertypic recombination in the nonstructural region of the EV-A76 isolate, as found with the EV-A89 donor sequence (also isolated in Xinjiang). The breakpoint of recombination is around nucleotide 3960, and the recombinant fragments covered part 2C and all P3 regions. This study increases publicly available EV-A76 nucleotide sequence and further our understanding EV-A76 molecular epidemiology.</p