Abstract
Light storage in an optical fiber is an attractive component in quantum optical delay line technologies. Although silica-core optical fibers are excellent in transmitting broadband optical signals, it is challenging to tailor their dispersive property to slow down a light pulse or store it in the silica-core for a long delay time. Coupling a dispersive and coherent medium with an optical fiber is promising in supporting long optical delay. Here, we load cold Rb atomic vapor into an optical trap inside a hollow-core photonic crystal fiber, and store the phase of the light in a long-lived spin-wave formed by atoms and retrieve it after a fully controllable delay time using electromagnetically-induced-transparency (EIT). We achieve over 50 ms of storage time and the result is equivalent to 8.7x10^-5 dB s^-1 of propagation loss in an optical fiber. Our demonstration could be used for buffering and regulating classical and quantum information flow between remote networks.
Highlights
Optical delay lines or optical buffers play important roles in long-distance quantum communication networks for storing, delaying, and, exchanging information between different quantum nodes
The phase of the optical pulse is mapped onto the atomic spin wave formed by a pair of long-lived hyperfine ground states and retrieved with a controllable delay using electromagnetically induced transparency (EIT)
When the atoms are in the fiber, we optically pump them into the F = 2, m = 0 state by a π -polarized light and a repump light coupled through the fiber
Summary
We assume the following for the dynamical decoupling (DD) simulations:. (1) The effective Rabi frequency R(r) of the EIT control and probe pulse for an atom at radial position r is Gaussian. (1) The effective Rabi frequency R(r) of the EIT control and probe pulse for an atom at radial position r is Gaussian. (2) The EIT fields are two-photon resonant on the unperturbed atomic transition. (3) The Rabi frequency M of the microwaves is uniform across the ensemble with a π -pulse time of 37 μs. (6) Initially, at t = 0, the phase of the microwaves is the same as the EIT fields, i.e., over time t, the microwave phase relative to an atom at position r is [ + δ(r)]t. The atom positions are fixed for the duration of the dynamical decoupling sequence. The ratio α of the ensemble size to the mode field radius, i.e., α ≡ Ratom/R, is used as the other fit parameter to the data
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