Detector Efficiency Limits on Quantum Improvement

Details Detector Efficiency Limits on Quantum Improvement Detector Efficiency Limits on Quantum Improvement

2004-02-26

arxiv.org/abs/quant-ph/0402201v1

Physics

Quantum Physics

LaTeX, 7 pages, 3 figures

Scientific paper

10.1080/09500340408231801

Although the National Institute of Standards and Technology has measured the intrinsic quantum efficiency of Si and InGaAs APD materials to be above 98 % by building an efficient compound detector, commercially available devices have efficiencies ranging between 15 % and 75 %. This means bandwidth, dark current, cost, and other factors are more important than quantum efficiency for existing applications. This paper systematically examines the generic detection process, lays out the considerations needed for designing detectors for non-classical applications, and identifies the ultimate physical limits on quantum efficiency.

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