Vacuum-assisted generation and control of atomic coherences at x-ray energies.

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Output type: Journal article

Author list: Heeg, Wille, Schlage, Guryeva, Schumacher, Uschmann, Schulze, Marx, Kämpfer, Paulus, Röhlsberger, Evers

Publisher: American Physical Society

Publication year: 2013

Volume number: 111

Issue number: 7

ISSN: 0031-9007

eISSN: 1079-7114

Languages: English-Great Britain (EN-GB)

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Open access status: green

Full text URL: https://bib-pubdb1.desy.de/record/154092/files/PhysRevLett.111.073601.pdf

Abstract

The control of light-matter interaction at the quantum level usually requires coherent laser fields. But already an exchange of virtual photons with the electromagnetic vacuum field alone can lead to quantum coherences, which subsequently suppress spontaneous emission. We demonstrate such spontaneously generated coherences (SGC) in a large ensemble of nuclei operating in the x-ray regime, resonantly coupled to a common cavity environment. The observed SGC originates from two fundamentally different mechanisms related to cooperative emission and magnetically controlled anisotropy of the cavity vacuum. This approach opens new perspectives for quantum control, quantum state engineering and simulation of quantum many-body physics in an essentially decoherence-free setting.

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