Dynamical Decoupling Using Slow Pulses: Efficient Suppression of 1/f Noise

Details Dynamical Decoupling Using Slow Pulses: Efficient Suppression of 1/f Noise Dynamical Decoupling Using Slow Pulses: Efficient Suppression of 1/f Noise

2002-11-14

arxiv.org/abs/quant-ph/0211081v3

Phys. Rev. A 69, 030302(R) (2004)

Physics

Quantum Physics

5 pages, 3 figures. v2: Many changes and updates

Scientific paper

10.1103/PhysRevA.69.030302

The application of dynamical decoupling pulses to a single qubit interacting with a linear harmonic oscillator bath with $1/f$ spectral density is studied, and compared to the Ohmic case. Decoupling pulses that are slower than the fastest bath time-scale are shown to drastically reduce the decoherence rate in the $1/f$ case. Contrary to conclusions drawn from previous studies, this shows that dynamical decoupling pulses do not always have to be ultra-fast. Our results explain a recent experiment in which dephasing due to $1/f$ charge noise affecting a charge qubit in a small superconducting electrode was successfully suppressed using spin-echo-type gate-voltage pulses.

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