1301.3364 (D. Viscor et al.)

Two-color quantum memory in double Λ-media    [PDF]

D. Viscor, V. Ahufinger, J. Mompart, A. Zavatta, G. C. La Rocca, M. Artoni

We propose a quantum memory for a single-photon wave packet in a superposition of two different colors, i.e., two different frequency components, using the electromagnetically induced transparency technique in a double-{\Lambda} system. We examine a specific configuration in which the two frequency components are able to exchange energy through a four-wave mixing process as they propagate, so the state of the incident photon is recovered periodically at certain positions in the medium. We investigate the propagation dynamics as a function of the relative phase between the coupling beams and the input single-photon frequency components. Moreover, by considering time-dependent coupling beams, we numerically simulate the storage and retrieval of a two-frequency-component single-photon qubit.

View original: http://arxiv.org/abs/1301.3364