11 research outputs found
Engineering chiral light-matter interaction in photonic crystal waveguides with slow light
We design photonic crystal waveguides with efficient chiral light--matter
interfaces that can be integrated with solid-state quantum emitters. By using
glide-plane-symmetric waveguides, we show that chiral light-matter interaction
can exist even in the presence of slow light with slow-down factors of up to
and therefore the light--matter interaction exhibits both strong Purcell
enhancement and chirality. This allows for near-unity directional
-factors for a range of emitter positions and frequencies. Additionally,
we design an efficient mode adapter to couple light from a standard nanobeam
waveguide to the glide-plane symmetric photonic crystal waveguide. Our work
sets the stage for performing future experiments on a solid-state platform
Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide
We demonstrate a high-purity source of indistinguishable single photons using a quantum dot embedded in a nanophotonic waveguide. The source features a near-unity internal coupling efficiency and the collected photons are efficiently coupled off chip by implementing a taper that adiabatically couples the photons to an optical fiber. By quasiresonant excitation of the quantum dot, we measure a single-photon purity larger than 99.4% and a photon indistinguishability of up to 94±1% by using p-shell excitation combined with spectral filtering to reduce photon jitter. A temperature-dependent study allows pinpointing the residual decoherence processes, notably the effect of phonon broadening. Strict resonant excitation is implemented as well as another means of suppressing photon jitter, and the additional complexity of suppressing the excitation laser source is addressed. The paper opens a clear pathway towards the long-standing goal of a fully deterministic source of indistinguishable photons, which is integrated on a planar photonic chip
Deterministic Single-Phonon Source Triggered by a Single Photon
We propose a scheme that enables the deterministic generation of single
phonons at GHz frequencies triggered by single photons in the near infrared.
This process is mediated by a quantum dot embedded on-chip in an
opto-mechanical circuit, which allows for the simultaneous control of the
relevant photonic and phononic frequencies. We devise new opto-mechanical
circuit elements that constitute the necessary building blocks for the proposed
scheme and are readily implementable within the current state-of-the-art of
nano-fabrication. This will open new avenues for implementing quantum
functionalities based on phonons as an on-chip quantum bus.Comment: 7 pages, 4 figure
A Charge-Tunable Quantum Dot Deep in The Strong Coupling Regime of Cavity QED
International audienceWe present high-cooperativity (C up to 140) strong coupling of a charge-tunable InAs quantum dot embedded in a tunable Fabry-PĂ©rot microcavity (Q=500,000). Via second-order correlation measurements we show high single-photon purity in the photon-blockade regime and pronounced vacuum Rabi oscillations in the photon-induced tunneling regime