Quasiparticle Decoherence in d-Wave Superconducting Qubits

M. H. S. Amin; A. Yu. Smirnov

doi:10.1103/PhysRevLett.92.017001

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Quasiparticle Decoherence in d-Wave Superconducting Qubits

M. H. S. Amin, A. Yu. Smirnov

DOI 10.1103/PhysRevLett.92.017001 · Physical Review Letters

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Abstract

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 nonequilibrium 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown