Prof. Alexander Sergienko, Boston University: Dispersion and abe

Prof. Alexander Sergienko Boston University (This email address is being protected from spambots. You need JavaScript enabled to view it.; http://people.bu.edu/alexserg); Titolo: Dispersion and aberration cancellation with entangled photons and their applications; Abstract: The flexibility and high information capacity of entangled states has been so far demonstrated in several areas of quantum communication and quantum computing. We developed recently several new techniques for ultra-precise optical measurement in life sciences, telecommunication, and nanotechnology. They take advantage of quantum entanglement and outperform traditional optical approaches both in resolution and in the amount of obtained information about the system under evaluation. The dispersion cancellation effect has been developed in the past and provided superior accuracy in quantum optical coherence tomography by eliminating dispersive broadening of low-coherence interference pattern. We recently designed a novel type of quantum interferometer allowing observation of both even- and odd-order spectral dispersion cancellation effects in a single experiment. The precise evaluation of polarization mode dispersion in telecommunication routers and characterization of dispersion-engineered nanodevices such as bandgap photonic crystal structures could benefit from the unusual possibility of independently evaluating even- and odd-order dispersion coefficients but still in one measurement. Aberration is a spatial counterpart of spectral dispersion. We recently demonstrated the possibility of canceling even-order aberrations using specific features of entangled and correlated photon states. This correlated imaging approach will help to enhance the resolution of optical imaging and microscopy in biomedical applications by eliminating detrimental effects of aberration.