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000171957 0247_ $$2arXiv$$aarXiv:1407.3059
000171957 0247_ $$2doi$$a10.1103/PhysRevB.90.134515
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000171957 1001_ $$aBarzanjeh, Sh.$$b0$$eCorresponding Author
000171957 245__ $$aDispersive Qubit Measurement by Interferometry with Parametric Amplifiers
000171957 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000171957 520__ $$aWe 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.
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000171957 7001_ $$0P:(DE-Juel1)143759$$aDiVincenzo, David$$b1$$ufzj
000171957 7001_ $$aTerhal, B. M.$$b2
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000171957 9141_ $$y2014
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