Single-photon detector in the microwave range

O. Astafiev, S. Komiyama, T. Kutsuwa, V. Antonov, Y. Kawaguchi, K. Hirakawa

Research output: Contribution to journalArticlepeer-review

101 Citations (Scopus)


Single-photon counting at microwave frequencies around 500 GHz is demonstrated by using a single-electron transistor (SET) formed by two capacitively coupled GaAs/AlxGa1-xAs parallel quantum dots (QDs). A point contact separating the double QDs allows the prompt escape of an excited electron from one of the QDs to another. The resulting long-lived photoinduced ionization of the QD is detected as a change in the SET current.

Original languageEnglish
Pages (from-to)4250-4252
Number of pages3
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 3 Jun 2002
Externally publishedYes


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