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Versatile wideband balanced detector for quantum optical homodyne tomography |
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| Authors: | R. Kumar E. BarriosA. MacRae E. CairnsE.H. Huntington A.I. Lvovsky |
| Affiliation: | a Institute for Quantum Information Science, University of Calgary, Calgary, Canada T2N 1N4 b Department of Chemistry, University of Calgary, Calgary, Canada T2N 1N4 c School of Engineering and Information Technology, University College, The University of New South Wales, Canberra ACT 2600, Australia d Russian Quantum Center, Moscow 121614, Russia |
| Abstract: | 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 the 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 standard commercial mode-locked lasers. |
| Keywords: | Wideband homodyne detector Quantum optics Shot noise Optoelectronics High-speed operational amplifier |
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