Journal
PHYSICAL REVIEW B
Volume 90, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.094518
Keywords
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Funding
- NSF [PHY-1055993, DMR-0805277, DMR-1151839]
- US Army Research Office [W911NF-12-1-0608]
- Sloan Foundation
- Packard Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1151839] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1055993] Funding Source: National Science Foundation
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A recent theoretical proposal suggests that a simple circuit utilizing two superinductors may produce a qubit with ground-state degeneracy [Brooks, Phys. Rev. A 87, 052306 (2013)]. We perform a full circuit analysis along with exact diagonalization of the circuit Hamiltonian to elucidate the nature of the spectrum and low-lying wave functions of this 0-pi device. We show that the ground-state degeneracy is robust to disorder in charge, flux, and critical current as well as insensitive to modest variations in the circuit parameters. Our treatment is nonperturbative, provides access to excited states and matrix elements, and is immediately applicable also to intermediate parameter regimes of experimental interest.
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