Quasiparticle Decoherence in d-wave Superconducting Qubits

Details Quasiparticle Decoherence in d-wave Superconducting Qubits Quasiparticle Decoherence in d-wave Superconducting Qubits

2003-04-11

arxiv.org/abs/cond-mat/0304255v3

Phys. Rev. Lett. 92, 017001 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, final version to appear in PRL

Scientific paper

10.1103/PhysRevLett.92.017001

It is usually argued that the presence of gapless quasiparticle excitations at the nodes of the d-wave superconducting gap should strongly decohere the quantum states of a d-wave qubit, making quantum effects practically unobservable. Using a self-consistent linear response non-equilibrium quasiclassical formalism, we show that this is not necessarily true. We find quasiparticle conductance of a d-wave grain boundary junction to be strongly phase dependent. Midgap states as well as nodal quasiparticles contribute to the conductance and therefore decoherence. Quantum behavior is estimated to be detectable in a qubit containing a d-wave junction with appropriate parameters.

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