Decoherence times of universal two-qubit gates in the presence of broad-band noise

Details Decoherence times of universal two-qubit gates in the presence of broad-band noise Decoherence times of universal two-qubit gates in the presence of broad-band noise

2011-05-02

arxiv.org/abs/1105.0333v2

New Journal of Physics 13, 093037 (2011)

Physics

Condensed Matter

Superconductivity

35 pages, 11 figures

Scientific paper

10.1088/1367-2630/13/9/093037

The controlled generation of entangled states of two quantum bits is a fundamental step toward the implementation of a quantum information processor. In nano-devices this operation is counteracted by the solid-state environment, characterized by a broadband and non-monotonic power spectrum, often 1/f at low frequencies. For single-qubit gates, incoherent processes due to fluctuations acting on different time scales result in peculiar short- and long-time behavior. Markovian noise gives rise to exponential decay with relaxation and decoherence times, T1 and T2, simply related to the symmetry of the qubit-environment coupling Hamiltonian. Noise with the 1/f power spectrum at low frequencies is instead responsible for defocusing processes and algebraic short-time behavior. In this paper, we identify the relevant decoherence times of an entangling operation due to the different decoherence channels originating from solid-state noise. Entanglement is quantified by concurrence, which we evaluate in an analytic form employing a multi-stage approach. The 'optimal' operating conditions of reduced sensitivity to noise sources are identified. We apply this analysis to a superconducting \sqrt{i-SWAP} gate for experimental noise spectra.

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