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Multiplying and detecting propagating microwave photons using inelastic Cooper-pair tunneling

Leppäkangas, Juha, 1979 (author)
Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
Marthaler, M. (author)
Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
Hazra, Dibyendu (author)
Université Grenoble Alpes,Grenoble Alpes University
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Jebari, Salha (author)
Université Grenoble Alpes,Grenoble Alpes University
Albert, Romain (author)
Université Grenoble Alpes,Grenoble Alpes University
Blanchet, Florian (author)
Université Grenoble Alpes,Grenoble Alpes University
Johansson, Göran, 1971 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Hofheinz, Max (author)
Université Grenoble Alpes,Grenoble Alpes University
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 (creator_code:org_t)
2018
2018
English.
In: Physical Review A. - 2469-9934 .- 2469-9926. ; 97:1
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The interaction between propagating microwave fields and Cooper-pair tunneling across a DC-voltage-biased Josephson junction can be highly nonlinear. We show theoretically that this nonlinearity can be used to convert an incoming single microwave photon into an outgoing n-photon Fock state in a different mode. In this process, the electrostatic energy released in a Cooper-pair tunneling event is transferred to the outgoing Fock state, providing energy gain. The created multiphoton Fock state is frequency entangled and highly bunched. The conversion can be made reflectionless (impedance matched) so that all incoming photons are converted to n-photon states. With realistic parameters, multiplication ratios n > 2 can be reached. By two consecutive multiplications, the outgoing Fock-state number can get sufficiently large to accurately discriminate it from vacuum with linear postamplification and power measurement. Therefore, this amplification scheme can be used as a single-photon detector without dead time.

Subject headings

NATURVETENSKAP  -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

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