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.

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

References in corpus (5)

• Quantum state engineering with Josephson-junction devices
• Quiet SDS Josephson Junctions for Quantum Computing
• Degenerate ground state in a mesoscopic YBaCuO grain boundary Josephson junction
• Charge Transport in Junctions between D-Wave Superconductors
• Tunnel junctions of unconventional superconductors

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• Switching Dynamics of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Intrinsic Josephson junctions: Macroscopic Quantum Tunneling and Self-Heating Effect
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• Arrays of Josephson junctions between unconventional superconductors