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Paper detail

Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers

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.

preprint2014arXivOpen access
Sh. BarzanjehD. P. DiVincenzoB. M. Terhal
quant-ph
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Sh. BarzanjehD. P. DiVincenzoB. M. Terhal

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