%0 Journal Article
%A Barzanjeh, Sh.
%A DiVincenzo, David
%A Terhal, B. M.
%T Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers
%J Physical review / B
%V 90
%N 13
%@ 1098-0121
%C College Park, Md.
%I APS
%M FZJ-2014-05511
%P 134515
%D 2014
%X We perform a detailed analysis of how an amplified interferometer can be used to enhance the quality of a dispersive qubit measurement, such as one performed on a superconducting transmon qubit, using homodyne detection on an amplified microwave signal. Our modeling makes a realistic assessment of what is possible in current circuit-QED experiments; in particular, we take into account the frequency-dependence of the qubit-induced phase shift for short microwaves pulses. We compare the possible signal-to-noise ratios obtainable with (single-mode) SU(1,1) interferometers with the current coherent measurement and find a considerable reduction in measurement error probability in an experimentally-accessible range of parameters.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000344021600007
%R 10.1103/PhysRevB.90.134515
%U https://juser.fz-juelich.de/record/171957