Publication Date:
1998-10-30
Description:
A double quantum dot device is a tunable two-level system for electronic energy states. A dc electron current was used to directly measure the rates for elastic and inelastic transitions between the two levels. For inelastic transitions, energy is exchanged with bosonic degrees of freedom in the environment. The inelastic transition rates are well described by the Einstein coefficients, relating absorption with stimulated and spontaneous emission. The most effectively coupled bosons in the specific environment of the semiconductor device used here were acoustic phonons. The experiments demonstrate the importance of vacuum fluctuations in the environment for quantum dot devices and potential design constraints for their use for preparing long-lived quantum states.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fujisawa -- Oosterkamp -- van der Wiel WG -- Broer -- Aguado -- Tarucha -- Kouwenhoven -- New York, N.Y. -- Science. 1998 Oct 30;282(5390):932-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉T. Fujisawa, Department of Applied Physics and DIMES, Delft University of Technology, 2600 GA Delft, Netherlands, and NTT Basic Research Laboratories, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. T. H. Oosterkamp, W. G. van d.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9794761" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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