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arXiv:1104.0374 · Physical Review B

Generation of entangled-photon pairs from biexcitons in CuCl thin films: Nano-to-bulk crossover regime

Motoaki Bamba, Hajime Ishihara

Published Jul 18, 2011• 1 citation
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Abstract

We have constructed a theoretical framework of biexciton-resonant hyperparametric scattering for pursuit of high-power and high-quality generation of entangled-photon pairs. Our framework is applicable to the nano-to-bulk crossover regime where the center-of-mass motions of excitons and biexcitons are confined and material surroundings and the polarization correlation of generated photons can be considered. We have analyzed the generation of ultraviolet entangled photons from CuCl film with and without dielectric microcavity and revealed that in the nano-to-bulk crossover regime we generally get a high performance from the viewpoint of statistical accuracy and the generation efficiency can be enhanced by the optical cavity while maintaining the high performance. The nano-to-bulk crossover regime has a variety of degrees of freedom to control the entangled-photon generation, and the scattering spectra explicitly reflect quantized exciton-photon coupled modes in finite structures.

DOI
10.1103/physrevb.84.045125

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We have constructed a theoretical framework of biexciton-resonant hyperparametric scattering for pursuit of high-power and high-quality generation of entangled-photon pairs. Our framework is applicable to the nano-to-bulk crossover regime where the center-of-mass motions of excitons and biexcitons are confined and material surroundings and the polarization correlation of generated photons can be considered. We have analyzed the generation of ultraviolet entangled photons from CuCl film with and without dielectric microcavity and revealed that in the nano-to-bulk crossover regime we generally get a high performance from the viewpoint of statistical accuracy and the generation efficiency can be enhanced by the optical cavity while maintaining the high performance. The nano-to-bulk crossover regime has a variety of degrees of freedom to control the entangled-photon generation, and the scattering spectra explicitly reflect quantized exciton-photon coupled modes in finite structures.
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We have theoretically investigated the generation of entangled photons from biexcitons in a semiconductor film with a thickness in the nano-to-bulk crossover regime. In contrast with the cases of quantum dots and bulk materials, we can highly control the generated state of entangled photons through the design of a peculiar energy structure of exciton-photon coupled modes in the thickness range between nanometers and micrometers. Owing to the enhancement of the radiative decay rate of excitons (exciton superradiance), the statistical accuracy of generated photons can be increased beyond the trade-off problem with signal intensity. By implementing an optical cavity structure in the strong-coupling regime, the generation efficiency can be enhanced while maintaining the high statistical accuracy.
We have prepared SiO 2 /CuCl layered structures and investigated the structural and optical properties, focusing on the observation of biexciton-resonant hyper-parametric scattering that is a promising process to generate entangled photons. A crystalline CuCl film, which is the active layer, was grown on an Al 2 O 3 substrate by a vacuum deposition method, and then an amorphous SiO 2 film as the passivation layer for hygroscopic CuCl was prepared by an rf-magnetron sputtering method. X-ray diffraction patterns and optical spectra of excitons indicate that the growth of the SiO 2 -passivation layer does not degrade the crystallinity of the underlying CuCl thin film. It has been demonstrated that the biexciton-resonant hyper-parametric scattering is clearly observable in the SiO 2 /CuCl layered structure.
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