Geometric superinductance qubits: Controlling phase delocalization
across a single Josephson junction
- URL: http://arxiv.org/abs/2106.05882v1
- Date: Thu, 10 Jun 2021 16:09:36 GMT
- Title: Geometric superinductance qubits: Controlling phase delocalization
across a single Josephson junction
- Authors: Matilda Peruzzo, Farid Hassani, Gregory Szep, Andrea Trioni, Elena
Redchenko, Martin \v{Z}emli\v{c}ka, Johannes Fink
- Abstract summary: We present a large variety of qubits all stemming from the same circuit but with drastically different characteristic energy scales.
The use of a geometric inductor results in high precision of the inductive and capacitive energy as guaranteed by top-down lithography.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: There are two elementary superconducting qubit types that derive directly
from the quantum harmonic oscillator. In one the inductor is replaced by a
nonlinear Josephson junction to realize the widely used charge qubits with a
compact phase variable and a discrete charge wavefunction. In the other the
junction is added in parallel, which gives rise to an extended phase variable,
continuous wavefunctions and a rich energy level structure due to the loop
topology. While the corresponding rf-SQUID Hamiltonian was introduced as a
quadratic, quasi-1D potential approximation to describe the fluxonium qubit
implemented with long Josephson junction arrays, in this work we implement it
directly using a linear superinductor formed by a single uninterrupted aluminum
wire. We present a large variety of qubits all stemming from the same circuit
but with drastically different characteristic energy scales. This includes flux
and fluxonium qubits but also the recently introduced quasi-charge qubit with
strongly enhanced zero point phase fluctuations and a heavily suppressed flux
dispersion. The use of a geometric inductor results in high precision of the
inductive and capacitive energy as guaranteed by top-down lithography - a key
ingredient for intrinsically protected superconducting qubits. The geometric
fluxonium also exhibits a large magnetic dipole, which renders it an
interesting new candidate for quantum sensing applications.
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