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A balanced gated-mode photon detector for qubit discrimination in 1550 nm

A photon detector combining the two avalanche photon diodes (APD) has been demonstrated for qubit discrimination in 1550 nm. Spikes accompanied with the signals in 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 7x10^-7 and 10^-4, respectively, without affecting the detection efficiency (11 %) at 178 K.

preprint2002arXivOpen access
Akihisa TomitaKazuo Nakamura
quant-ph
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Akihisa TomitaKazuo Nakamura

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