Multimode cavity-assisted quantum storage via continuous phase-matching control

Abstract

A scheme for spatial multimode quantum memory is developed such that spatial-temporal structure of a weak signal pulse can be stored and recalled via cavity-assisted off-resonant Raman interaction with a strong angular-modulated control field in an extended Λ-type atomic ensemble. It is shown that effective multimode storage is possible when the Raman coherence spatial grating involves wave vectors with different longitudinal components relative to the paraxial signal field. The possibilities of implementing the scheme in the solid-state materials are discussed.

Multiresonator quantum memory

“…Lately such condition became important for the QM realization on the atomic ensembles in a single mode resonator [21,22,27,28] and for controlling the perfect light-atoms quantum dynamics [17,51,52] in similar systems. The impedance condition physically adjusts the optimal interference effects of the light media interaction in the resonant cavities that significantly facilitates the implementation of the main requirements to the quantum dynamics of light.…”

Solid-state Raman quantum memory in whispering gallery mode resonators: signal-to-noise ratio

“…They can demonstrate very small inhomogeneous broadening of optical transitions, reaching tens of MHz, which proves to be smaller than the hyperfine splitting of the energy levels of impurity ions. As a result, these crystals are promising candidates for implementing memory protocols based on off-resonant Raman interaction [5][6][7]. In the present work, we analyse the possibility of implementing optical quantum memory via off-resonant Raman absorption and emission of single-photon pulses in such crystals placed in a cavity and achieving large signal-to-noise ratio at the output of the memory device.…”

Studying the fidelity of quantum memory based on control-field angular scanning

“…To store and recall optical pulses, such as single-photon wave packets, one can take advantage of an inhomogeneous broadened atomic transition (storage via photon echo) or can use a modulated control field amplitude which matches an input pulse (storage via electromagnetically induced transparency or off-resonant Raman interaction). Recently, another approach has been proposed [5][6][7] which requires neither inhomogeneous broadening nor temporal modulation of the control field amplitude, but resorts to continuous phase-matching control in an extended resonant medium. When considering off-resonant Raman interaction of a single-photon wave packet and a classical control field in a three-level atomic medium, the phase-matching control can be achieved by modulating the refractive index of the resonant medium [5] or by modulating the direction of propagation of the control field [6,7].…”

“…Recently, another approach has been proposed [5][6][7] which requires neither inhomogeneous broadening nor temporal modulation of the control field amplitude, but resorts to continuous phase-matching control in an extended resonant medium. When considering off-resonant Raman interaction of a single-photon wave packet and a classical control field in a three-level atomic medium, the phase-matching control can be achieved by modulating the refractive index of the resonant medium [5] or by modulating the direction of propagation of the control field [6,7]. In particular, a scheme for spatially multimode cavity-assisted quantum storage has been developed in [7].…”