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All-optical control of photon statistics with hybrid quantum plasmonic system

Dongxing Zhao

Published Feb 4, 2018• 0 citations
OpenAlex

Abstract

We propose an all-optical scheme to control the photon statistics using hybrid quantum plasmonic system. With the aid of dressed states, it is shown that the photon correlation of signal field can be continuously modulated from bunching to antibunching under the control of a pump field. Apart from the exact multimode model, we identify the roles of multimode coupling and quantum interference between probability amplitudes, peculiar to the studied system, through a single-mode model and an analytical treatment. Different from the cavity quantum electrodynamics methods, the proposed scheme works well in the bad cavity limit. These findings suggested that this hybrid system provides a feasible nanophotonic platform for active modulation of photon correlation and for future quantum devices.

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We propose an all-optical scheme to control the photon statistics using hybrid quantum plasmonic system. With the aid of dressed states, it is shown that the photon correlation of signal field can be continuously modulated from bunching to antibunching under the control of a pump field. Apart from the exact multimode model, we identify the roles of multimode coupling and quantum interference between probability amplitudes, peculiar to the studied system, through a single-mode model and an analytical treatment. Different from the cavity quantum electrodynamics methods, the proposed scheme works well in the bad cavity limit. These findings suggested that this hybrid system provides a feasible nanophotonic platform for active modulation of photon correlation and for future quantum devices.
We propose an all-optical scheme to control the photon statistics using the hybrid quantum plasmonic system. With the aid of dressed-state-assisted quantum interference effects, it is shown that the photon correlations of a signal field can be continuously modulated from bunching to antibunching under the control of a pump field. Apart from the exact multimode model, a single-mode model and an analytical treatment are also provided to help us identify the roles of multimode coupling and quantum interference between probability amplitudes. The proposed scheme, in contrast to the cavity quantum electrodynamics methods, works well even in the bad cavity limit. These findings suggest that this composite system provides a feasible nanophotonic platform for active modulation of photon statistics and for future quantum devices.
Using a scattered field interference mechanism, we theoretically demonstrate the quantum statistics control with a hybrid system comprised of a quantum emitter and a plasmonic multimode nanocavity. Enhanced through multimode interactions, destructive interference between scattered fields from the emitter and nanocavity is able to change the photon statistics from bunching to antibunching. This transition cannot be explained by treating the plasmonic nanocavity in the dipole approximation. In some specific regions, an effective single-mode model, which is equivalent to the multimode model, is derived by simply shifting the transition frequency and modifying decay rates of the nearby quantum emitter. Superior to the closed optical microcavity, this hybrid system can be used to control the photon statistics without the need for strong coupling, and may find applications in nanoscale refractive index sensing.
Controlling photon statistics is pivotal to many applications in classical and quantum photonics. While steady-state photon statistics have been widely studied, dynamically manipulating these statistical properties in time remains elusive. Herein, we propose a scheme to actively control photon statistics between bunching and antibunching regimes through quantum interference. Our approach relies on a Raman-coupled cavity-atom system with parametric amplification, where time modulating the detuning of the intermediate state allows us to either deepen the photon blockade or enhance photon bunching. Simultaneous modulation of the cavity and intermediate-state detunings produces antibunching that cannot be achieved under static conditions or by modulating either detuning alone. Because the modulation is periodic, the antibunching reappears at regular time intervals, enabling time-gated photon antibunching under continuous-wave operation at a repetition rate determined by the modulation frequency. These results show a versatile mechanism based on Raman-assisted quantum interference for dynamically engineering photon correlations.
There exists a growing interest in the properties of the light generated by hybrid systems involving a mesoscopic number of emitters as a means of providing macroscopic quantum light sources. In this work, the quantum correlations of the light emitted by a collection of emitters coupled to a generic optical cavity are studied theoretically using an effective Hamiltonian approach. Starting from the single-emitter level, we analyze the persistence of photon antibunching as the ensemble size increases. Not only is the photon blockade effect identifiable, but photon antibunching originated from destructive interference processes, the so-called unconventional antibunching, is also present. We study the dependence of these two types of negative correlations on the spectral detuning between cavity and emitters, as well as its evolution as the time delay between photon detections increases. Throughout this work, the performance of plasmonic nanocavities and dielectric microcavities is compared: despite the distinct energy scales and the differences introduced by their respectively open and closed character, the bunching and antibunching phenomenology presents remarkable similarities in both types of cavities.
Quantum engineering of photons is a key requirement for the development of quantum technology. Here, we put forward a scheme to investigate extensively quantum statistical characteristics of the photons and their engineering in a hybrid nanoparticle-emitter-cavity architecture through placing a nanoparticle (NP) and a quantum emitter (QE), called NP-QE molecule, into an optical cavity, where the coherent tripartite coupling emerges in the interactions among the NP, QE, and cavity. The photons are collected from the two different channels, i.e., the cavity emission and the NP-QE molecule scattering. Due to the composite nature of the tripartite dressed excitations of our fully coupled system and the destructive interference between different transition pathways for the two-photon excitation, the nontrivial quantum statistical properties, such as unconventional single-photon blockade and strong photon superbunching, can be achieved even within the bad cavity limit (without the need of the strong-coupling condition) when the NP-QE molecule is driven by an external laser not interacting the cavity mode. It is also revealed that the photon autocorrelation and cross-correlation properties are well modified by regulating the size-dependent system parameters, such as the NP-to-QE distance and the NP radius. The small-coupling strength required, the ease of parameter tuning, the relaxation of high-cavity quality factor, and the robustness to the dephasing rate in realistic scenarios all benefit the generation of single-photon sources, which has potential applications in quantum information and quantum communication.