TY  - JOUR
AU  - Barzanjeh, Sh.
AU  - DiVincenzo, David
AU  - Terhal, B. M.
TI  - Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers
JO  - Physical review / B
VL  - 90
IS  - 13
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2014-05511
SP  - 134515
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000344021600007
DO  - DOI:10.1103/PhysRevB.90.134515
UR  - https://juser.fz-juelich.de/record/171957
ER  -