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Journal of Modern Optics

Reversible storage of a weak light pulse optimized by spontaneously generated coherence

Tianhui Qiu, Hongyang Ma, Chunhong Zheng, Libo Chen

Published Jan 9, 2015• 0 citations
Publisher

Abstract

We investigate the storage and retrieval of a weak light pulse in a Λ-type three-level atomic gas medium with spontaneously generated coherence and pumped by an incoherent field. The scheme works based on electromagnetically induced transparency and can promote retrieval efficiency. We show how to make the combination choice of the system parameters required not only for the perfect retrieval operation but also for the high atom-field coupling efficiency.

DOI
10.1080/09500340.2014.997817

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We investigate the storage and retrieval of a weak light pulse in a Λ-type three-level atomic gas medium with spontaneously generated coherence and pumped by an incoherent field. The scheme works based on electromagnetically induced transparency and can promote retrieval efficiency. We show how to make the combination choice of the system parameters required not only for the perfect retrieval operation but also for the high atom-field coupling efficiency.
We investigate the reversible storage of a weak single-mode light signal in a Λ-type three-level atomic system with spontaneously generated coherence (SGC) and pumped by an incoherent field. The scheme is phase-dependent. If the phase of the controlling field is set oppositely to that of the signal field, the combination of SGC with weak pump overcomes the drawback of incompletely retrieval in the conventional scheme, leading to 100% retrieval fidelity or even to the amplification of the retrieved signal with respect to its initial one.
We investigate the storage and retrieval of a weak signal pulse in a medium composed of $N \ensuremath{\Lambda}$-type three-level atoms in thermal motion. Both atomic internal and translational degrees of freedom are treated quantum mechanically, based on which momentum families that are closed with respect to the action of the interaction Hamiltonian are defined. We introduce momentum-dependent collective atomic density operators by sorting the atoms into groups according to their momenta and establish Heisenberg equations for these atomic operators and the signal field. Because of the thermal-motion-dependent dephasing effect in the establishment of electromagnetically induced transparency of the medium, the efficiency of transfer between the signal pulse and the medium is reduced. The numerical simulations show that the performance of the scheme can be improved by applying the copropagation configuration of the light fields and preparing the atoms initially with a small width of the thermal momentum distribution, which is assumed to be the Gaussian function, or in the state where the Raman-Nath approximation is tenable.
We study the dispersion and absorption spectra of a weak probe in a $\ensuremath{\Lambda}$-type three-level atomic system with closely ground sublevels driven by a strong field and damped by a broadband squeezed vacuum. We analyze the interplay between the spontaneous generated coherence and the squeezed field on the susceptibility of the atomic system. We find that by varying the intensity of the squeezed field the group velocity of a weak pulse can change from subluminal to superluminal. In addition we exploit the fact that the properties of the atomic medium can be dramatically modified by controlling the relative phase between the driving field and the squeezed field, allowing us to manipulate the group velocity at which light propagates. The physical origin of this phenomenon corresponds to a transfer of the atomic coherence from electromagnetically induced transparency to electromagnetically induced absorption. Besides, this phenomenon is achieved under nearly transparency conditions and with negligible distortion of the propagation pulse.
A robust light storage and retrieval (LSR) in high dimensions is highly desirable for light and quantum information processing. However, most schemes on LSR realized up to now encounter problems due to not only dissipation, but also dispersion and diffraction, which make LSR with a very low fidelity. Here we propose a scheme to achieve a robust storage and retrieval of weak nonlinear high-dimensional light pulses in a coherent atomic gas via electromagnetically induced transparency. We show that it is available to produce stable (3 + 1)-dimensional light bullets and vortices, which have very attractive physical property and are suitable to obtain a robust LSR in high dimensions.
The recent prospect of efficient, reliable, and secure quantum communication relies on the ability to coherently and reversibly map nonclassical states of light onto long-lived atomic states. A promising technique that accomplishes this employs Electromagnetically Induced Transparency (EIT), in which a strong classical control field modifies the optical properties of a weak signal field in such a way that a previously opaque medium becomes transparent to the signal field. The accompanying steep dispersion in the index of refraction allows for pulses of light to be decelerated, then stored as an atomic excitation, and later retrieved as a photonic mode. This dissertation presents the results of investigations into methods for optimizing the memory efficiency of this process in an ensemble of hot Rb atoms. We have experimentally demonstrated the effectiveness of two protocols for yielding the best memory efficiency possible at a given atomic density. Improving memory efficiency requires operation at higher optical depths, where undesired effects such as four-wave mixing (FWM) become enhanced and can spontaneously produce a new optical mode (Stokes field). We present the results of experimental and theoretical investigations of the FWM-EIT interaction under continuous-wave (cw), slow light, and stored light conditions. In particular, we provide evidence that indicates that while a Stokes field is generated upon retrieval of the signal field, any information originally encoded in a seeded Stokes field is not independently preserved during the storage process. We present a simple model that describes the propagation dynamics and provides an intuitive description of the EIT-FWM process.
We propose a scheme to realize the storage and retrieval of Airy light wave packets in a $\ensuremath{\Lambda}$-type three-level atomic gas via electromagnetically induced transparency. We first show that (1 + 1)-dimensional Airy light wave packets with very slow propagating velocity and extremely low generation power can be stored and retrieved by switching off and on a control field. We then demonstrate that ultraslow and ultraweak (3 + 1)-dimensional light wave packets, by combining a spatial Bessel or Airy beam with an Airy temporal profile, can also be generated, stored, and retrieved in a controllable way. Because the Airy light wave packets obtained can withstand both diffraction and dispersion in a linear propagation regime, their storage and retrieval are more desirable and promising for quantum information processing in comparison with other types of light wave packets.