Abstract
While several methods of information processing have been realized in quantum memories, thorough utilization of the spatial degree of freedom in highly-multimode memories demands a flexible method analogous to spatial light modulators (SLM) widely exploited in the broad field of optics to modulate the amplitude or phase of light. We want to present a spatial spin-wave modulator (SSM), allowing engineering of a spatial phase of spin-waves stored in a cold atomic memory. Using the SLM and polarizers we are able to shape a laser beam into an arbitrary shape. Such a prepared beam illuminates a cold rubidium cloud and due to ac-Stark effect the spatial phase of stored spin-waves is modified. The relative standard deviation of phase given by our SSM amounts to about 10%. We have also shown that losses scale quadratically with given phase. On one hand, that strongly limits the efficiency of SSM for strong phase modulation, but on the other hand enables efficient modulation in small range of several radians.
© 2019 IEEE
PDF ArticleMore Like This
Michał Parniak, Mateusz Mazelanik, Adam Leszczyński, Michał Lipka, Michał Dąbrowski, and Wojciech Wasilewski
S4C.2 Quantum Information and Measurement (QIM) 2019
Alexey Tiranov, Moritz Businger, Sacha Welinski, Alban Ferrier, Philippe Goldner, Nicolas Gisin, and Mikael Afzelius
S1D.5 Quantum Information and Measurement (QIM) 2019
Mateusz Mazelanik, Michał Parniak, Adam Leszczyński, Michał Lipka, and Wojciech Wasilewski
T5A.72 Quantum Information and Measurement (QIM) 2019