Physics – Instrumentation and Detectors
Scientific paper
2011-11-17
Physics
Instrumentation and Detectors
11 pages, 8 figures, 1 table
Scientific paper
We present a comprehensive theory and an easy to follow method for the design and construction of a wideband homodyne detector for time-domain quantum measurements. We show how one can evaluate the performance of a detector in a specific time-domain experiment based on electronic spectral characteristic of that detector. We then present and characterize a high-performance detector constructed using inexpensive, commercially available components such as low-noise high-speed operational amplifiers and high-bandwidth photodiodes. Our detector shows linear behavior up to a level of over 13 dB clearance between shot noise and electronic noise, in the range from DC to 100 MHz. The detector can be used for measuring quantum optical field quadratures both in the continuous-wave and pulsed regimes with pulse repetition rates up to about 250 MHz.
Barrios Erick
Cairns E.
Huntington Elanor H.
Kumar Ranjeet
Lvovsky Alexander I.
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