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Quantum Beats in Time Resolved X‐Ray Interference Experiments
Author(s) -
Rode G.,
Jex H.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200004)218:2<391::aid-pssb391>3.0.co;2-m
Subject(s) - physics , beat (acoustics) , optics , interference (communication) , astronomical interferometer , interferometry , photon , quantum beats , diffraction , quantum interference , crystal (programming language) , quantum , atomic physics , quantum mechanics , channel (broadcasting) , electrical engineering , computer science , programming language , engineering
We have employed LLL‐type X‐ray interferometers with a splitted mirror crystal and quartz crystals attached aside each mirror. Ultrasound waves of different frequencies f 1 and f 2 around 10 MHz are fed into these mirrors. The ultrasound modulations of the coherently splitted X‐ray beams inside the interferometer are analysed in time resolved interference experiments correlating the phase of the phonons with the registration time of the photons. In the interference intensity we observe quantum beat frequencies down to Δ f = 96 mHz (in energy scale Δ E = h Δ f = 397 atto‐eV) as well as the two ultrasound frequencies and their overtones mf 1 and nf 2 ( m , n = 1, 2, 3) and the sum frequency Σ f = f 1 + f 2 .