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arXiv · 1101.2712

Period-doubling-bifurcation readout for a Josephson qubit

Alexander B. Zorin·Yuriy Makhlin
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Abstract

We propose a threshold detector with an operation principle, based on a parametric period-doubling bifurcation in an externally pumped nonlinear resonance circuit. The ac-driven resonance circuit includes a dc-current-biased Josephson junction ensuring parametric frequency conversion (period-doubling bifurcation) due to its quadratic nonlinearity. A sharp onset of oscillations at the half-frequency of the drive allows for detection of small variations of an effective inductance and, therefore, the read-out of the quantum state of a coupled Josephson qubit. The bifurcation characteristics of this circuit are compared with those of the conventional Josephson bifurcation amplifier, and its possible advantages are discussed.

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Alexander B. Zorin, Yuriy Makhlin. 2011-01-14. Period-doubling-bifurcation readout for a Josephson qubit. https://doi.org/10.1103/physrevb.83.224506

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