Our research is focused on quan­tum optics, i.e. the appli­ca­tion of quan­tum the­o­ry to phe­nom­e­na involv­ing light and its inter­ac­tion with atom­ic and mechan­i­cal sys­tems. The tools of quan­tum optics, com­bined with those of quan­tum infor­ma­tion sci­ences, are pro­vid­ing new and unex­pect­ed pos­si­bil­i­ties that we use for both applied physics and fun­da­men­tal research. Most of our stud­ies are done in close col­lab­o­ra­tion with lead­ing exper­i­men­tal groups.

The dis­tri­b­u­tion of quan­tum states over long dis­tances has impor­tant appli­ca­tions, for exam­ple, in quan­tum key dis­tri­b­u­tion. How­ev­er, this dis­tri­b­u­tion is inher­ent­ly lim­it­ed by pho­ton loss, and direct ampli­fi­ca­tion as used in clas­si­cal telecom­mu­ni­ca­tion is not an option in quan­tum com­mu­ni­ca­tion due to the no-cloning the­o­rem. This could be over­come with the use of quan­tum net­works. We work hand in hand with lead­ing exper­i­men­tal groups on each com­po­nent of these net­works. This includes pro­to­cols for entan­gle­ment cre­ation and entan­gle­ment purifi­ca­tion, quan­tum mem­o­ries and net­work cer­ti­fi­ca­tion.


Nico­las San­gouard

Pro­fes­sor of Quan­tum Optics The­o­ry

aicha [.] lang [@] uni­bas [.] ch

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