Decoherence due to nodal quasiparticles in d-wave qubits

Details Decoherence due to nodal quasiparticles in d-wave qubits Decoherence due to nodal quasiparticles in d-wave qubits

2003-04-16

arxiv.org/abs/cond-mat/0304383v2

JETP Letters 77, 587 (2003) [Pis'ma v ZhETF 77, 691 (2003)]

Physics

Condensed Matter

Superconductivity

5 pages, 3 EPS figures; the style file jetpl.cls is included. Version 2: minor corrections

Scientific paper

10.1134/1.1595702

We study the Josephson junction between two d-wave superconductors, which is discussed as an implementation of a qubit. We propose an approach that allows to calculate the decoherence time due to an intrinsic dissipative process: quantum tunneling between the two minima of the double-well potential excites nodal quasiparticles which lead to incoherent damping of quantum oscillations. The decoherence is weakest in the mirror junction, where the contribution of nodal quasiparticles corresponds to the superohmic dissipation and becomes small at small tunnel splitting of the energy level in the double-well potential. For available experimental data, we estimate the quality factor.

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