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Input-output descri...
Input-output description of microwave radiation in the dynamical Coulomb blockade
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- Leppäkangas, Juha, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Johansson, Göran, 1971 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Marthaler, M. (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Fogelström, Mikael, 1963 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2014-01-10
- 2014
- English.
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In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 16, s. Article nr. 015015-
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Abstract
Subject headings
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- We study microwave radiation emitted by a small voltage-biased Josephson junction connected to a superconducting transmission line. An input-output formalism for the radiation field is established, using a perturbation expansion in the junction's critical current. Using output field operators solved up to the second order, we estimate the spectral density and the second-order coherence of the emitted field. For typical transmission line impedances and at frequencies below the main emission peak at the Josephson frequency, radiation occurs predominantly due to two-photon emission. This emission is characterized by a high degree of photon bunching if detected symmetrically around half of the Josephson frequency. Strong phase fluctuations in the transmission line make related nonclassical phase-dependent amplitude correlations short lived, and there is no steady-state two-mode squeezing. However, the radiation is shown to violate the classical Cauchy-Schwarz inequality of intensity cross-correlations, demonstrating the nonclassicality of the photon pair production in this region.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- tunnel-junctions
- noise
- josephson-junction
Publication and Content Type
- art (subject category)
- ref (subject category)
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