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Journal of the Optical Society of America B

Coherent field-controlled single-photon transmission in the atom-cavity-waveguide coupled system

Xiangyang Yu, Jianhong Li, Xiao-bin Li

Published Feb 15, 2013• 8 citations
Publisher

Abstract

Starting from the semiclassical theory of light–matter interaction, we have theoretically investigated the substantial influences of two coherent driving fields on manipulating the single-photon transmission probability in the extensively studied atom-cavity-waveguide coupled system. The results strictly demonstrate that under the relatively large photon-cavity detuning and moderately strong driving fields, the single-photon transmission probability increases remarkably from the original 0 to 1 by controlling the coherent fields in the nondissipative environment, which manifests the manipulation of the coherent fields as a sort of highly controllable external tool to efficiently act as an experimentally available all-optical quantum switching. In contrast, the behavior independent from variation of coherent fields and characterized by the stationary transmission spectrum appears under the photon-atom on-resonance condition. Similar properties can also be observed in the dissipative environment. These distinct characteristics essentially reveal some significant functionalities of coherent field control in influencing the single-photon transmission spectrum, which may have potential applications in designing efficient photonic devices.

DOI
10.1364/josab.30.000649

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Starting from the semiclassical theory of light–matter interaction, we have theoretically investigated the substantial influences of two coherent driving fields on manipulating the single-photon transmission probability in the extensively studied atom-cavity-waveguide coupled system. The results strictly demonstrate that under the relatively large photon-cavity detuning and moderately strong driving fields, the single-photon transmission probability increases remarkably from the original 0 to 1 by controlling the coherent fields in the nondissipative environment, which manifests the manipulation of the coherent fields as a sort of highly controllable external tool to efficiently act as an experimentally available all-optical quantum switching. In contrast, the behavior independent from variation of coherent fields and characterized by the stationary transmission spectrum appears under the photon-atom on-resonance condition. Similar properties can also be observed in the dissipative environment. These distinct characteristics essentially reveal some significant functionalities of coherent field control in influencing the single-photon transmission spectrum, which may have potential applications in designing efficient photonic devices.
Abstract We theoretically investigate the influences of two coherent driving fields on the asymmetric transmission of single photon in the atom-waveguide system. The atom is considered as a Λ system. One transition of the atom chirally couples to the waveguide. The other transition is driven by two coherent driving fields. The transmission probabilities for the single photon incidents from the left ( T lr ) and right ( T rl ) are given respectively. The calculated results show that one can realize T lr = 0 ( T rl ≠ 0) or T rl = 0 ( T lr ≠ 0) by manipulating the phase difference between the two coherent driving fields. The influence of the decay rate of the metastable state on the asymmetric transmission is also discussed.
We theoretically investigate the coherent manipulation of biphoton generation via spontaneous four-wave mixing in a cavity-QED system with a single atom. The atom is driven by pumping, coupling, and driving fields, and the generation of the Stokes and anti-Stokes photons are enhanced by two cavities. By solving the master equation in the steady state, we analyze the spectral brightness, as well as the degree of the auto-correlation and cross-correlation. Our results show that when the pumping and driving fields are in two-photon resonance, the dark state established between the ground and Rydberg states. efficiently enhances the controllability of the driving field over the biphoton generation and the quantum statistics. In contrast, under large two-photon detuning, the control capability of the driving field is significantly reduced. The coupling field, which directly relates to the electromagnetically induced transparency, modifies the linewidth of the biphoton, while the atom-cavity coupling strength only changes the brightness without affecting the linewidth.
Abstract Controllable single-photon scattering in a one-dimensional waveguide coupled to a Jaynes–Cummings structure containing a time-modulated two-level atom interacting with a single-mode cavity is investigated. The photon transmission and reflection amplitudes are calculated by using an effective Floquet Hamiltonian in real space. The results show that the coupling between the atom and the cavity mode can dynamically be tuned via periodically modulating the atomic transition frequency. As a consequence, the scattering behaviors of the waveguide photons can be actively manipulated, and a controllable single-photon switch with high on-off ratio could be realized. More interestingly, the switch works well within a wide frequency region, i.e., the transmission of both resonant and off-resonant waveguide photons can be effectively switched on or off with appropriate system parameters. Furthermore, the proposed dynamically tunable switching scheme is robust against atomic dissipation associated with the help of atom-cavity coupling mismatch. Such single-photon device can be used as an elementary unit for various quantum information processing.
All-optical manipulation of a single-photon quantum transport is of fundamental importance in quantum nanophotonics. Here, a system consisting of a single-mode waveguide coupling with a V-type three-level atom is proposed, where two excited states of the atom are strongly driven by the external coherent field. Transmission and reflection spectra for the output photon at different frequency components, including virtual transitions induced by the ultrastrong driving, are calculated. The interaction between the waveguide photon and the driven atom experiences quantum interferences, which leads to a variety of capabilities for manipulating the single-photon transport in the spectral domain. We perform simulations to demonstrate the possibilities of achieving desired frequency conversions as well as generating different correlated single-photon states by using external drive field at chosen strength. Our work therefore studies the single-photon transport in a strongly driven atom–waveguide system and shows applications for all-optically manipulating the single photon in the field of quantum information processing.
Coherent manipulation of a single photon’s propagation behaviors is investigated theoretically through fully utilizing the external coherent driving fields exerted into a one-dimensional optical waveguide system with multiple three-level Λ-type periodically arrayed atoms. It is explicitly shown that the transmission amplitude can be changed arbitrarily and dramatically between one and zero as well as maintain a large-scale steady threshold by constructing the corresponding transition pathways. This characteristic presented above demonstrates that the external controllable tool can perform efficiently as a useful large-scale functional gate to engineer the photon’s propagation behavior such as determinedly targeting its travelling direction, which could have some potential applications in the multi-dimensional quantum network.
We study the transmission and reflection properties of a single-photon pulse in a one-dimensional waveguide side coupled with a Jaynes-Cummings system, namely, a multi-cavity with an embedded Rydberg atom. A Single-photon pulse is applied to tune the atoms energy spectrum, and varying it can bring the atomic qubit transition on or off-resonance for the cavity. The transmission and reflection behavior are systematically explored by a real-space model Hamiltonian and we find that the coupling strength between the waveguide and the side optical cavity exerts a tremendous impact on it. The influence of cavity and atomic dissipations and the incident pulse width on the transport properties of the single-photon is also investigated simultaneously. Based on these phenomena, we point out the possibility of utilizing this system as a single-photon transport in practice and has potential applications in quantum information.