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The receiver Bob

This Bob receives photons through the yellow fiber-optic cable coming from Alice (or from Eve as has been the case in our eavesdropping experiment). The polarization of each received photon is analyzed in a compact unit (top) that contains four single-photon detectors. The timing of photon detection events is recorded by a timestamp unit (bottom).
Both units have been built at the Centre for quantum technologies, Singapore.

This picture from Quantum Hacking group gallery is included in Picture Collection (ref. nr. a295-5) on Photo Pages.

Taken on July 5, 2009 at the National University of Singapore.
Fujichrome Sensia 100 film, Canon EOS-3, EF 75–300 1:4–5.6 II lens, polarizer and 82C filter, f/22, mixed incandescent and fluorescent lighting, tripod. Scanned on Nikon LS-2000 scanner.

How you can use this image. ©2009 Vadim Makarov