On-Chip Architecture for Self-Homodyned Nonclassical Light

Abstract

In the last decade, there has been remarkable progress on the practical integration of on-chip quantum photonic devices yet quantum state generators remain an outstanding challenge. Simultaneously, the quantum-dot photonic-crystal-resonator platform has demonstrated a versatility for creating nonclassical light with tunable quantum statistics, thanks to a newly discovered selfhomodyning interferometric effect that preferentially selects the quantum light over the classical light when using an optimally tuned Fano resonance. In this work, we propose a general structure for the cavity quantum electrodynamical generation of quantum states from a waveguide-integrated version of the quantum-dot photonic-crystal-resonator platform, which is specifically tailored for preferential quantum state transmission. We support our results with rigorous Finite-Difference Time-Domain and quantum optical simulations, and show how our proposed device can serve as a robust generator of highly pure single-and even multi-photon states.

Tunable Photon Statistics Exploiting the Fano Effect in a Waveguide

“…Number-state filtering, in which the weighting of the individual number states is controlled, can generate a quantum output state from such a classical coherent input (for instance, via photon blockade [9][10][11][12][13]). The use of interference has emerged as an extremely powerful tool in this regard: it has been shown theoretically that it can be used to realize complex photon statistics in cavity [14][15][16] and waveguide [17,18] quantum electrodynamics (QED), and to generate single photons with simultaneous subnatural linewidth using resonance fluorescence [19]. Experimentally, the photon statistics of a coherent input have been manipulated via quantum interference in the weakly coupled regime of cavity QED [20,21], most recently using the unconventional photon blockade [22].…”

“…An example of an interference phenomenon widely observed in photonics is the Fano effect [23].AF a n o resonance arises due to interference between a discrete transition and a background continuum, with the maxima and minima of the resulting spectral line shape arising from constructive and destructive interference, respectively. It has been shown theoretically that the detuning relative to the Fano resonance can be used to enable tunable number-state filtering [17,24,25]. To demonstrate this, we employ an integrated quantum photonic device comprising a single quantum two-level system, namely a QD, coupled to a single-mode optical waveguide.…”

Generation of Non‐Classical Light Using Semiconductor Quantum Dots

“…To realize this interferometric cancellation condition in an on‐chip transmission geometry a sample design based on an input and output waveguide which are coupled not only to the cavity but also to a partially transmitting element (PTE) can be used ( Figure 8a). The simulated transmission of such a proposed structure (Figure 8b) is presented in Figure 8c for which shows the transmission with the PTE fully blocking (JC‐system) and tuned to optimal interferometric cancellation as dashed and solid lines, respectively . Here, a fabricable Q‐factor of the cavity of ≈51.000 in the absence of the waveguides and an easily achievable coupling strength of have been used .…”

Impact of detuning and dephasing on a laser-corrected subnatural-linewidth single-photon source

“…This laser correction removes, through destructive interferences, the excess of coherent emission when focusing on the δ peak, in a process akin to an homodyne interference [65,66]. Similar schemes have been recently implemented to obtain a source of indistinguishable photons [14], to observe the rising of the socalled dynamical Mollow triplet [67] and to unveil the photon correlations of the light emitted by a Jaynes-Cummings system [68]. In our case, we find that not only this laser-correction allows to realise simultaneously subnatural linewidth spectral emission and antibunching, but also that it produces a stronger type of single-photon emission with a plateau in the time-resolved photon correlation g (2) a (τ ).…”