Phys. Rev. Lett. 99, 206804 (2007) [4 pages]Frequency-Selective Single-Photon Detection Using a Double Quantum DotReceived 22 May 2007; published 14 November 2007 We use a double quantum dot as a frequency-tunable on-chip microwave detector to investigate the radiation from electron shot-noise in a near-by quantum point contact. The device is realized by monitoring the inelastic tunneling of electrons between the quantum dots due to photon absorption. The frequency of the absorbed radiation is set by the energy separation between the dots, which is easily tuned with gate voltages. Using time-resolved charge-detection techniques, we can directly relate the detection of a tunneling electron to the absorption of a single photon. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.206804
DOI:
10.1103/PhysRevLett.99.206804
PACS:
73.21.La, 72.40.+w, 72.70.+m, 73.23.Hk
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