Spin frequency comb echo memory controlled by a pulsed-gradient of magnetic field

Abstract

The controllable storage and on demand retrieval of the microwave pulses by using the photon echo quantum memory approach based on a spin frequency comb of inhomogeneous broadening (SFC-protocol) have been demonstrated. We have used an electron-nuclear spin ensemble of tetracyanoethylene anion radicals in toluene which has a natural periodic structure of narrow electron-spin resonance (ESR) hyperfine lines. On-demand retrieval of the stored field has been realized by using two pulses of the magnetic field gradient of an opposite polarity which hold the electron spins in a dephased excited state during the storage time. The obtained experimental results demonstrate promising properties for coherent controlling the electron-nuclear spin ensemble of radicals in liquid that could be useful for implementation of room-temperature broadband quantum memory.

Preservation of quantum correlations in a femtosecond light pulse train within an atomic ensemble

“…At present, a number of schemes imprinting quantum state of the field on the long-lived degrees of freedom available in the material medium has been found. They are based on different mechanisms of interaction: effect of Electromagnetically Induced Transparency [11][12][13][14][15][16], Quantum Nondemolition schemes [17][18][19][20], Raman interaction in a Λ-configuration [21][22][23][24][25], high-speed resonant memory [26,27], Controlled Reversible Inhomogeneous Broadening [28][29][30][31], and Atomic Frequency Comb [32][33][34][35][36].…”