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Quantum noise in heterodyne detection

Wengler, Michael J. and Woody, David P. (1987) Quantum noise in heterodyne detection. IEEE Journal of Quantum Electronics, 23 (5). pp. 613-622. ISSN 0018-9197. doi:10.1109/JQE.1987.1073387.

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A fully quantum mechanical theory of diode mixers which includes quantization of the external circuit is presented. We find that Tucker's theory for SIS mixer conversion efficiencies is correct, but that his expression for the measurement noise must be augmented by an amount corresponding to half a photon at every frequency to which the mixer responds. Noise in high quality SIS mixers is shown to be accurately described by the conceptually simpler photodiode mixer noise theory. The radiation coupling efficiency term, η, which appears in photodiode theory turns out to be the coupling efficiency between the signal source admittance and the admittance which the SIS presents to the LO. Our theory reduces to Caves' quantum linear amplifier formalism, and therefore predicts measurement noises bounded by the quantum lower limit of hv/k_B. Predictions of performance versus frequency for SIS's are made. We predict that NbN SIS's will behave as nearly ideal photodiodes for frequencies as high as 3000 GHz.

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Additional Information:© 1987 IEEE. Manuscript received September 10, 1986; revised December 8, 1986. This work was supported by the National Science Foundation under Grants AST-8214693 and 8311849.
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Issue or Number:5
Record Number:CaltechAUTHORS:20170718-160808922
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Official Citation:M. Wengler and D. Woody, "Quantum noise in heterodyne detection," in IEEE Journal of Quantum Electronics, vol. 23, no. 5, pp. 613-622, May 1987. doi: 10.1109/JQE.1987.1073387
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79168
Deposited On:18 Jul 2017 23:33
Last Modified:15 Nov 2021 17:46

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