Period-doubling-bifurcation readout for a Josephson qubit

Details Period-doubling-bifurcation readout for a Josephson qubit Period-doubling-bifurcation readout for a Josephson qubit

2011-01-14

arxiv.org/abs/1101.2712v1

Phys. Rev. B 83 (2011) 224506

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages

Scientific paper

10.1103/PhysRevB.83.224506

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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