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Quantum Information Processing

Reversible storage and manipulation of light pulses with orbital angular momentum

Tianhui Qiu, Hui Li, Min Xie, Hongyang Ma

Published Dec 16, 2019• 5 citations
Publisher
DOI
10.1007/s11128-019-2544-7

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Structured light associated with Laguerre-Gauss (LG) modes carrying orbital angular momentum (OAM) is an important tool in many different areas, ranging from optical tweezers to classical and quantum communication systems [1]. In this work we demonstrated the amplification and the storage of light with OAM employing the magnetically assisted gain mechanism. This gain mechanism is based on the manipulation of the dark-state created by a coupling and a probe beam in the Zeeman sublevels of a degenerate two-level system and can provide single-pass optical gain exceeding 100% [2], [3].

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The paper reports on the storage of superposition of orbital angular momentum (OAM) states, as well as its manipulation through an applied transverse magnetic field. In the experiment , Zeeman sublevels of the degenerate two-level system is used. In another series of experiments,an external dc magnetic field is applied, nearly orthogonal to the plane defined by the incident beams. In this case,a series of collapses and revivals of the stored Zeeman coherence is observed. These observations demonstrate that superposition of OAM states can be stored into the atomic ensemble, and also the reversible transfer of OAM between light and atoms. Moreover, it also shows that the stored OAM can be manipulated with an external magnetic field.
We propose a double-M\mathsf{M}M system of cold atoms for realizing the reversible storage and manipulation of signal fields encoded in degrees of freedom (DOFs) of polarization and orbital angular momentum (OAM). By employing two pairs of counterpropagating controlling fields, we show that the system exhibits dark state polaritons relating to the polarization and propagation direction of the light fields. Through the active operation of the controlling fields in time, stationary light pulses with polarizations and OAM information can be generated due to the tight coupling and balanced competition between the retrieved signal fields, and can be manipulated coherently and all-optically. Another advantage of our proposed scheme is that the two polarization components of the signal field can be decoupled and thus be independently retrieved from the atomic ensemble, and then the scheme can be employed to realize polarization-dependent beam splitting. Such a multiple DOF-dependent scheme could pave the way toward quantum nonlinear optics without a cavity, and could greatly enhance the tunability and capacity for both classical and quantum information processing.
Structured light associated with Laguerre-Gauss (LG) modes carrying orbital angular momentum (OAM) is an important tool in many different areas, ranging from optical tweezers to classical and quantum communication systems [1]. In this work we demonstrated the amplification and the storage of light with OAM employing the magnetically assisted gain mechanism. This gain mechanism is based on the manipulation of the dark-state created by a coupling and a probe beam in the Zeeman sublevels of a degenerate two-level system and can provide single-pass optical gain exceeding 100% [2], [3].