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arXiv:1306.2183 · Physical Review B

Single-photon blockade in doubly resonant nanocavities with second-order nonlinearity

Arka Majumdar, Dario Gerace

Published Jun 26, 2013• 180 citations
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Abstract

We propose the use of nanostructured photonic nanocavities made of ${\ensuremath{\chi}}^{(2)}$ nonlinear materials as prospective passive devices to generate strongly sub-Poissonian light via single-photon blockade of an input coherent field. The simplest scheme is based on the requirement that the nanocavity be doubly resonant, i.e., possess cavity modes with good spatial overlap at both the fundamental and second-harmonic frequencies. We discuss the feasibility of this scheme with state-of-the art nanofabrication technology and the possibility to use it as a passive single-photon source on demand.

DOI
10.1103/physrevb.87.235319

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Abstract We propose a scheme to generate strongly sub-Poissonian light via photon blockade in a photonic crystal nanocavity embedded with a χ (2) nonlinear material and two interacting quantum dots (QD). The second- order correlation function at zero time delay g (2) (0) in our scheme can be reduced to g (2) (0) ∼ 10 −3 by a large χ (2) nonlinearity and by optimizing the QD and optical cavity detuning. Our proposal provides a highly tunable and efficient method for single photon source on demand which has potential applications in solid state based quantum information processing.
It is shown that noncentrosymmetric materials with bulk second-order nonlinear susceptibility can be used to generate strongly antibunched radiation at an arbitrary wavelength, solely determined by the resonant behavior of suitably engineered coupled microcavities. The proposed scheme exploits the unconventional photon blockade of a coherent driving field at the input of a coupled cavity system, where one of the two cavities is engineered to resonate at both fundamental and second harmonic frequencies, respectively. Remarkably, the unconventional blockade mechanism occurs with reasonably low quality factors at both harmonics, and does not require a sharp doubly resonant condition for the second cavity, thus proving its feasibility with current semiconductor technology.
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Generating correlated photons is an essential technology for photonic quantum information experiments. Increasing the generation efficiency of photon pairs via the enhancement of material nonlinearity is important for various applications including a near-on-demand single photon source based on multiplexed photon pair sources [1]. In this regard, photonic crystal nanocavities are attractive nonlinear media thanks to a high Q value and a wavelength-sized mode volume, which lead to the significant nonlinearity enhancement. However, such cavities generally support single resonant mode, whereas multiple resonance frequencies are required for photon pair generation processes. Coupled photonic crystal nanocavities have been studied to obtain multiple resonance frequencies [2-4]. However, there has been no report on the resonant photon pair generation from the coupled photonic crystal cavities.