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Title: Parametric amplification by coupled flux qubits

We report parametric amplification of a microwave signal in a Kerr medium formed from superconducting qubits. Two mutually coupled flux qubits, embedded in the current antinode of a superconducting coplanar waveguide resonator, are used as a nonlinear element. Shared Josephson junctions provide the qubit-resonator coupling, resulting in a device with a tunable Kerr constant (up to 3 × 10{sup −3}) and a measured gain of about 20 dB. This arrangement represents a unit cell which can be straightforwardly extended to a quasi one-dimensional quantum metamaterial with large tunable Kerr nonlinearity, providing a basis for implementation of wide-band travelling wave parametric amplifiers.
Authors:
; ;  [1] ;  [2] ; ; ;  [3] ;  [3] ;  [4]
  1. Department of Experimental Physics, Comenius University, SK-84248 Bratislava (Slovakia)
  2. (Slovakia)
  3. Leibniz Institute of Photonic Technology, P.O. Box 100239, D-07702 Jena (Germany)
  4. (Russian Federation)
Publication Date:
OSTI Identifier:
22262537
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; JOSEPHSON JUNCTIONS; KERR EFFECT; MICROWAVE RADIATION; NONLINEAR PROBLEMS; PARAMETRIC AMPLIFIERS; QUBITS; RESONATORS; TRAVELLING WAVES