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Quantum Information Processing

Reversible storage of entangled two-mode wavepacket based on electromagnetically induced transparency

Fang-Zhou Wu, Tianhui Qiu, Guojian Yang

Published Jul 25, 2018• 1 citation
Publisher
DOI
10.1007/s11128-018-1992-9

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The research of Airy beams has attained much attention due to their unique characteristics. Coherent control of Airy beams is important for further light beam manipulation and information processing. In this paper, we experimentally investigate the storage and retrieval of 2D Airy wavepackets in a solid-state medium driven by electromagnetically induced transparency (EIT). The transverse profile of the weak probe pulse is modulated by Airy wavepackets. Under EIT condition, the probe Airy wavepackets are stored into the experimental medium by manipulating the intensity of the control field, and later retrieved by the opposite process. The retrieved Airy wavepackets keep a high similarity compared with those before the storage. Furthermore, the self-healing property of the retrieved Airy wavepackets is investigated. This storage of Airy wavepackets develops the control method of Airy beams, which will be useful in further applications.
We investigate the storage and retrieval of photon entanglement based on electromagnetically induced transparency where atomic thermal motion cannot be neglected. The reversible transfer of entanglement between atomic ensembles and photon modes is described in terms of the dark state generalized to a mixture of entangled collective moving atoms and entangled photon modes. We analyze the retrieval ability of photon entanglement from atomic ensembles with inhomogeneous broadening and find that the scheme in the degenerated and resonant light–atom configuration is almost immune to atomic thermal motion.
We study the modification of a traditional electromagnetically induced transparency (EIT) stored-light technique that includes both EIT and four-wave mixing (FWM) in an ensemble of hot Rb atoms. The standard treatment of light storage involves the coherent and reversible mapping of one photonic mode onto a collective spin coherence. It has been shown that unwanted, competing processes such as four-wave mixing are enhanced by EIT and can significantly modify the signal optical pulse propagation. We present theoretical and experimental evidence to indicate that, while a Stokes field is indeed detected 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 of the fields and the impact of FWM on the spin wave.