A photon number resolving detector is a fundamental device for realizing quantum computing, to say nothing of improving quantum key distribution. It is considered possible to establish a multipurpose optical quantum computer by combining of a photon number resolving detector and non‐classical light such as a single photon or squeezed light in a feedback system. We are developing a photon number resolving detector at the telecommunication wavelength of 1.5 μm, in which the attenuation ratio of optical fiber is minimum. We adopt a InGaAs pin photodiode and a GaAs JFET in a charge integration amplifier, that is cooled to 4.2 K to reduce thermal noise and leak current.

Topics
Electronic noise, Optical fibers, Photodiodes, Quantum computing, Quantum information, Semiconductors, Telecommunications
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© 2004 American Institute of Physics.
2004
American Institute of Physics
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