Quantum and nonlinear optics at the single photon level with quantum dots in optical nanocavities

Dirk Englund, Ilya Fushman, Andrei Faraon +1 more

Shuo Sun, Kai Müller

Satoshi Iwamoto, Yasutomo Ota, Hiroyuki Takagi +2 more

We will present our recent advances on single quantum dot-photonic crystal nanocavity coupled systems. Cavity enhanced two-photon emission and large optical Stark effect with extremely low control power in these systems will be mainly discussed.

Ilya Fushman, Dirk Englund, Andrei Faraon +3 more

Optical nonlinearities enable photon-photon interaction and lie at the heart of several proposals for quantum information processing, quantum nondemolition measurements of photons, and optical signal processing. To date, the largest nonlinearities have been realized with single atoms and atomic ensembles. We show that a single quantum dot coupled to a photonic crystal nanocavity can facilitate controlled phase and amplitude modulation between two modes of light at the single-photon level. At larger control powers, we observed phase shifts up to pi/4 and amplitude modulation up to 50%. This was accomplished by varying the photon number in the control beam at a wavelength that was the same as that of the signal, or at a wavelength that was detuned by several quantum dot linewidths from the signal. Our results present a step toward quantum logic devices and quantum nondemolition measurements on a chip.

Matthew T. Rakher

Yasuhiko Arakawa

We discuss our recent advances in optical nonlinear phenomena in quantum dot-photonic crystal nanocavity coupled systems. These include spontaneous two photon emission, nanocavity-based self-frequency conversion, and cavity enhanced optical Stark effects.