Andreev Level Qubit

A. Zazunov; V. S. Shumeiko; E. N. Bratus’; J. Lantz; G. Wendin

doi:10.1103/PhysRevLett.90.087003

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Andreev Level Qubit

A. Zazunov, V. S. Shumeiko, E. N. Bratus’, J. Lantz, G. Wendin

DOI 10.1103/PhysRevLett.90.087003 · Physical Review Letters

T1

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Abstract

We investigate the dynamics of a two-level Andreev bound state system in a transmissive quantum point contact embedded in an rf SQUID. Coherent coupling of the Andreev levels to the circulating supercurrent allows manipulation and readout of the level states. The two-level Hamiltonian for the Andreev levels is derived, and the effect of interaction with the quantum fluctuations of the induced flux is studied. We also consider an inductive coupling of qubits and discuss the relevant SQUID parameters for qubit operation and readout.

Source-reported materials — not catalogue approval

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