Light Storage in Doped Solids

In recent years, a large number of experimental studies in quantum information science have been conducted in atomic gases. However, gases typically suffer from low storage densities, difficulties to enlarge the setup towards realistic storage capacities, and perturbing atomic diffusion. Particular “atom-like” solid state systems (e.g. colour centers, quantum dots, or doped crystals) offer attractive solutions here. Rare-earth ion doped crystals combine the advantages of gases (i.e. spectrally narrow transition) and solids (i.e. scalability and large density). Moreover, doped crystals are commercially available and easy to handle.

In our projects we implement efficient and reliable protocols to coherently store and manipulate optical data (i.e. light pulses and images) in rare-earth ion doped solids. In particular, we apply electromagnetically-induced transparency (EIT) to store optical data in the crystal, or stimulated Raman adiabatic passage (STIRAP) to manipulate the data (e.g. to perform logic operations). Moreover, we develop new technologies, e.g. based on composite pulse sequences or self-learning evolutionary algorithms to improve the performance of the protocols in the complex quantum systems. As prominent results, we “stopped” and stored light pulses and images by EIT in atomic coherences in a Pr:YSO crystal. The dopand atoms in the crystal serve as a quantum memory for an incoming light pulse. The information is written to (and afterwards read from) coherent superposition states, i.e. the atoms are at the same time in the ground and a metastable state. Our world-record EIT storage times in the crystal approach the regime of one minute. In related experiments, we reached EIT storage efficiencies for light pulses up to 76 %, i.e. the largest efficiencies ever obtained in doped solids and protocols therein.


[5] Robust not gate by single-shot-shaped pulses: Demonstration of the efficiency of the pulses in rephasing atomic coherences
L. Van-Damme, D. Schraft, G. T. Genov, D. Sugny, T. Halfmann, and S. Guérin
Phys. Rev. Lett. 118, 133202 (2017)
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[4] Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling
G. T. Genov, D. Schraft, N. V. Vitanov, and T. Halfmann
Phys. Rev. Lett. 118, 133202 (2017)
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[3] Stopped light at high storage efficiency in a Pr3+:Y2SiO5 crystal
D. Schraft, M. Hain, N. Lorenz, and T. Halfmann
Phys. Rev. Lett. 116, 073602 (2016)
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[2] Correction of arbitrary field errors in population inversion of quantum systems by universal composite pulses
G. Genov, D. Schraft, T. Halfmann, and N.V. Vitanov
Phys. Rev. Lett. 113, 043001 (2014)
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[1] Stopped light and image storage by electromagnetically induced transparency up to the regime of one minute
G. Heinze, C. Hubrich, and T. Halfmann
Phys. Rev. Lett. 111, 033601 (2013)
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Prof. Dr. Thomas Halfmann
Nichtlineare Optik/Quantenoptik
Institut für Angewandte Physik
Fachbereich 05 - Physik
Technische Universität Darmstadt
Hochschulstr. 6
D-64289 Darmstadt

+49 6151 16-20740

+49 6151 16-20741 (Sekretariat)

+49 6151 16-20327


T. Halfmann on ResearcherID

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