Decoherence Due to Nodal Quasiparticles in d-wave Qubits
Abstract
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.
- Publication:
-
Soviet Journal of Experimental and Theoretical Physics Letters
- Pub Date:
- May 2003
- DOI:
- 10.1134/1.1595702
- arXiv:
- arXiv:cond-mat/0304383
- Bibcode:
- 2003JETPL..77..587F
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- 5 pages, 3 EPS figures