Document Detail

Amplitude spectroscopy of a solid-state artificial atom.
MedLine Citation:
PMID:  18769433     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The energy-level structure of a quantum system, which has a fundamental role in its behaviour, can be observed as discrete lines and features in absorption and emission spectra. Conventionally, spectra are measured using frequency spectroscopy, whereby the frequency of a harmonic electromagnetic driving field is tuned into resonance with a particular separation between energy levels. Although this technique has been successfully employed in a variety of physical systems, including natural and artificial atoms and molecules, its application is not universally straightforward and becomes extremely challenging for frequencies in the range of tens to hundreds of gigahertz. Here we introduce a complementary approach, amplitude spectroscopy, whereby a harmonic driving field sweeps an artificial atom through the avoided crossings between energy levels at a fixed frequency. Spectroscopic information is obtained from the amplitude dependence of the system's response, thereby overcoming many of the limitations of a broadband-frequency-based approach. The resulting 'spectroscopy diamonds', the regions in parameter space where transitions between specific pairs of levels can occur, exhibit interference patterns and population inversion that serve to distinguish the atom's spectrum. Amplitude spectroscopy provides a means of manipulating and characterizing systems over an extremely broad bandwidth, using only a single driving frequency that may be orders of magnitude smaller than the energy scales being probed.
David M Berns; Mark S Rudner; Sergio O Valenzuela; Karl K Berggren; William D Oliver; Leonid S Levitov; Terry P Orlando
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Nature     Volume:  455     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-04     Completed Date:  2008-10-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  51-7     Citation Subset:  -    
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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Comment In:
Nature. 2008 Sep 4;455(7209):41-3   [PMID:  18769428 ]

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