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Electromagnetically induced transparency with resonant nuclei in a cavity

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Abstract

The manipulation of light–matter interactions by quantum control of atomic levels has had a profound impact on optical sciences. Such manipulation has many applications, including nonlinear optics at the few-photon level1,2,3, slow light4,5, lasing without inversion6,7,8 and optical quantum information processing9,10. The critical underlying technique is electromagnetically induced transparency, in which quantum interference between transitions in multilevel atoms11,12,13,14,15 renders an opaque medium transparent near an atomic resonance. With the advent of high-brilliance, accelerator-driven light sources such as storage rings or X-ray lasers, it has become attractive to extend the techniques of optical quantum control to the X-ray regime16,17. Here we demonstrate electromagnetically induced transparency in the regime of hard X-rays, using the 14.4-kiloelectronvolt nuclear resonance of the Mössbauer isotope iron-57 (a two-level system). We exploit cooperative emission from ensembles of the nuclei, which are embedded in a low-finesse cavity and excited by synchrotron radiation. The spatial modulation of the photonic density of states in a cavity mode leads to the coexistence of superradiant and subradiant states of nuclei, respectively located at an antinode and a node of the cavity field. This scheme causes the nuclei to behave as effective three-level systems, with two degenerate levels in the excited state (one of which can be considered metastable). The radiative coupling of the nuclear ensembles by the cavity field establishes the atomic coherence necessary for the cancellation of resonant absorption. Because this technique does not require atomic systems with a metastable level, electromagnetically induced transparency and its applications can be transferred to the regime of nuclear resonances, establishing the field of nuclear quantum optics.

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Figure 1: Calculated reflectivity spectra of different cavity configurations.
Figure 2: Effective EIT level scheme of the nuclei in the cavity.
Figure 3: Origin of the coherent control field in the cavity.
Figure 4: Observation of nuclear resonant EIT.

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Acknowledgements

We are grateful to R. Rüffer for the loan of the stainless steel analyser foil and to E. Burkel for the loan of the Mössbauer drive. Moreover, we acknowledge F.-U. Dill and A. Scholl for help with the experimental set-up, A. Rothkirch for help during the data processing and U. von Hörsten for performing the conversion electron Mössbauer measurements of the samples. We are indebted to W. Pfützner for assistance during sample preparation. Finally, we acknowledge discussions with J. Evers.

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R.R. designed the experiment, developed the theoretical description, coordinated the experimental efforts and wrote the paper. H.-C.W. and K.S. set up the beamline instrumentation and data acquisition systems and operated the beamline. B.S. prepared and characterized the samples. All authors participated in performing the experiment, discussing the experimental results and editing the manuscript.

Corresponding author

Correspondence to Ralf Röhlsberger.

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The authors declare no competing financial interests.

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This file contains a Supplementary Discussion and Equations, Supplementary Figures 1-6 with legends and additional references. (PDF 466 kb)

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Röhlsberger, R., Wille, HC., Schlage, K. et al. Electromagnetically induced transparency with resonant nuclei in a cavity. Nature 482, 199–203 (2012). https://doi.org/10.1038/nature10741

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