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2015 ; 6
(ä): 7606
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Observation of non-Markovian micromechanical Brownian motion
#MMPMID26216619
Gröblacher S
; Trubarov A
; Prigge N
; Cole GD
; Aspelmeyer M
; Eisert J
Nat Commun
2015[Jul]; 6
(ä): 7606
PMID26216619
show ga
All physical systems are to some extent open and interacting with their
environment. This insight, basic as it may seem, gives rise to the necessity of
protecting quantum systems from decoherence in quantum technologies and is at the
heart of the emergence of classical properties in quantum physics. The precise
decoherence mechanisms, however, are often unknown for a given system. In this
work, we make use of an opto-mechanical resonator to obtain key information about
spectral densities of its condensed-matter heat bath. In sharp contrast to what
is commonly assumed in high-temperature quantum Brownian motion describing the
dynamics of the mechanical degree of freedom, based on a statistical analysis of
the emitted light, it is shown that this spectral density is highly non-Ohmic,
reflected by non-Markovian dynamics, which we quantify. We conclude by
elaborating on further applications of opto-mechanical systems in open system
identification.