Phase-slip flux qubits
By J. Mooij, C. Harmans. 2005
173 citations recorded by the source corpus.
In thin superconducting wires, phase-slip by thermal activation near the critical temperature is a well-known effect. It has recently become clear that phase-slip by quantum tunnelling through the energy barrier can also have a significant rate at low temperatures. In this paper, it is suggested that quantum phase-slip can be used to realize a superconducting quantum bit without Josephson junctions. A loop containing very thin nanofabricated wire is biased with an externally applied magnetic flux of half a flux quantum, resulting in two states with opposite circulating current and equal energy. Quantum phase-slip should provide coherent coupling between these two macroscopic states. Numbers are given for a wire of amorphous niobium-silicon that can be fabricated with advanced electron beam lithography.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/69f267b6ab03796c847dee65a5db175520db0912
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Single-electron current sources: towards a refined definition of ampere (2012, background): “Although there is no a commonly accepted expression for ΓQPS, it is agreed (Arutyunov et al., 2008; Mooij and Harmans, 2005) that: ΓQPS ∝ exp(−0.3A RQ2R ξ ), where A is a constant of order unity and RQ = π~/e2.”