Session T26: Superconducting Qubits: Measurements
2:30 PM–5:30 PM, Wednesday, March 17, 2010
Room: D136
Sponsoring Unit:
GQI
Chair: Leo DiCarlo, Yale University
Abstract ID: BAPS.2010.MAR.T26.2
Abstract: T26.00002 : Two-port directional parametric amplifier
2:42 PM–2:54 PM
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Abstract 
Authors:
Archana Kamal
(Departments of Physics and Applied Physics, Yale University)
Michel Devoret
(Departments of Physics and Applied Physics, Yale University)
John Clarke
(Department of Physics, University of California Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory)
Parametric amplifiers working at the quantum limit are indispensable for fast, accurate measurements of superconducting qubits and other sensitive mesoscopic systems. Conventional microwave parametric amplifiers usually operate as one-port reflection devices and rely on non-reciprocal components like circulators. Besides affecting the magnetic environment near delicate superconducting devices, circulators are problematic for on-chip integration owing to their relatively bulky size. We will present the results of a theoretical analysis of a minimal-noise directional amplifier based on parametric Josephson devices, which would avoid the need for circulators in quantum-limited measurements. The link between the non-reciprocal operation of this amplifier and the dynamics of the microwave dc SQUID amplifier will be discussed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.T26.2