Main field of study: 011200 Physics
Area of specialization: Coherent Optics
Department of general physics I
Scientific advisor: Prof. Dr. T.Yu. Golubeva
Reviewer: Ph. D. A.S. Losev

Mode analysis in Lambda type quantum memory problem
N.I. Masalaeva

We consider the model of high speed quantum memory based on the interaction of driving and signal fields with atomic medium in the lambda configuration. Information about the spatial transverse structure of a quantum field is written and stored in long-lived coherence of the lower energy levels. It is assumed that the lifetime of the upper excited state is much larger than the duration of the processes of write-in and read-out.
For such a system was obtained and solved the system of Heisenberg equations describing the evolution of the field and atomic coherence in time and space. We studied eigenvectors and eigenvalues of the integral operator that describes the transformation of a quantum field from the input signal to the output retrieved signal in full memory cycle. Furthermore, we estimated the scalability problem for the protocol of high speed quantum memory.