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Optics Letters

Optics Letters


  • Vol. 27, Iss. 20 — Oct. 15, 2002
  • pp: 1827–1829

Balanced, gated-mode photon detector for quantum-bit discrimination at 1550 nm

Akihisa Tomita and Kazuo Nakamura  »View Author Affiliations

Optics Letters, Vol. 27, Issue 20, pp. 1827-1829 (2002)

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A photon detector that combines two avalanche photodiodes (APDs) has been demonstrated for quantum-bit discrimination at 1550 nm. Spikes accompanied by signals in a gated mode were canceled by balanced output from the two APDs. The spike cancellation enabled one to reduce the threshold in the discriminators and thus the gate pulse voltage. The dark count probability and afterpulse probability were reduced to 7×10-7 and 7×10-4 , respectively, without affecting the detection efficiency (11%) at 178 K.

© 2002 Optical Society of America

OCIS Codes
(040.3780) Detectors : Low light level
(230.5170) Optical devices : Photodiodes
(270.5570) Quantum optics : Quantum detectors

Akihisa Tomita and Kazuo Nakamura, "Balanced, gated-mode photon detector for quantum-bit discrimination at 1550 nm," Opt. Lett. 27, 1827-1829 (2002)

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