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HL: Fachverband Halbleiterphysik

HL 49: Quantum information systems: mostly concepts (with TT)

HL 49.6: Vortrag

Mittwoch, 18. März 2015, 12:15–12:30, EW 202

Resonant exchange qubit under influence of electrical noise — •Maximilian Russ and Guido Burkard — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

In this work we investigate the influence of electrical charge noise on a resonant exchange (RX) qubit in a triple quantum dot. This RX qubit is a variation of the exchange-only qubit [1] which responds only to a narrow-band resonant frequency [2,3]. Our noise model includes uncorrelated charge noise in each quantum dot giving rise to two independent (noisy) bias parameters. We calculate the energy splitting of the two qubit states as a function of these two bias detuning parameters to find “sweet spots”, where the noise suppression is maximized. Our investigation shows that such sweet spots exist within the low bias regime, in which the bias detuning parameters have the same magnitude as the hopping parameters. The location of the sweet spots depends on the bias detuning and the hopping asymmetry between the quantum dots.

[1] D. P. DiVincenzo et al., Nature 408, 339 (2000).

[2] J. Medford et al., Phys. Rev. Lett. 111, 050501 (2013).

[3] J. M. Taylor, V. Srinivasa, and J. Medford, Phys. Rev. Lett. 111, 050502 (2013).