Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Implementation of Protected Qubits with π-periodic Josephson Elements

B. L. T. Plourde

Published Mar 19, 2021• 0 citations
OpenAlex

Related papers

Implementation of π-periodic Josephson Elements for Topologically Protected Charge-Parity Qubits

Yebin Liu, Kenneth Dodge, Michael Senatore +9 more

Bulletin of the American Physical Society•Mar 7, 2019•0 citations

Possible Implementation of Topologically Protected Qubits by a Novel Class of Josephson Junction Arrays

L. B. Ioffe

Springer eBooks•Dec 13, 2005•0 citations

Protected qubits and quantum computation using Josephson junctions

Alexei Kitaev

Bulletin of the American Physical Society•Mar 15, 2006•0 citations

Implementation of decoherence-protected logical qubits in medium-size Josephson junction arrays

Benoît Douçot, L. B. Ioffe

•Jun 22, 2008•0 citations

Protected Josephson Rhombus Chains

M. T. Bell, Joshua Paramanandam, L. B. Ioffe +1 more

We have studied the low-energy excitations in a minimalistic protected Josephson circuit which contains two basic elements (rhombi) characterized by the π periodicity of the Josephson energy. Novel design of these elements, which reduces their sensitivity to the offset charge fluctuations, has been employed. We have observed that the lifetime T1 of the first excited state of this quantum circuit in the protected regime is increased up to 70 μs, a factor of ∼100 longer than that in the unprotected state. The quality factor ω01T1 of this qubit exceeds 106. Our results are in agreement with theoretical expectations; they demonstrate the feasibility of symmetry protection in the rhombus-based qubits fabricated with existing technology.

arXiv:1311.6521•Physical Review Letters•Apr 25, 2014•88 citations

Hardware Implementation of Quantum Stabilizers in Superconducting Circuits

Kenneth Dodge, Y. Liu, A. R. Klots +7 more

Stabilizer operations are at the heart of quantum error correction and are typically implemented in software-controlled entangling gates and measurements of groups of qubits. Alternatively, qubits can be designed so that the Hamiltonian corresponds directly to a stabilizer for protecting quantum information. We demonstrate such a hardware implementation of stabilizers in a superconducting circuit composed of chains of π-periodic Josephson elements. With local on-chip flux and charge biasing, we observe a progressive softening of the energy band dispersion with respect to flux as the number of frustrated plaquette elements is increased, in close agreement with our numerical modeling.

arXiv:2303.00625•Physical Review Letters•Oct 13, 2023•11 citations
We have studied the low-energy excitations in a minimalistic protected Josephson circuit which contains two basic elements (rhombi) characterized by the π periodicity of the Josephson energy. Novel design of these elements, which reduces their sensitivity to the offset charge fluctuations, has been employed. We have observed that the lifetime T1 of the first excited state of this quantum circuit in the protected regime is increased up to 70 μs, a factor of ∼100 longer than that in the unprotected state. The quality factor ω01T1 of this qubit exceeds 106. Our results are in agreement with theoretical expectations; they demonstrate the feasibility of symmetry protection in the rhombus-based qubits fabricated with existing technology.
Stabilizer operations are at the heart of quantum error correction and are typically implemented in software-controlled entangling gates and measurements of groups of qubits. Alternatively, qubits can be designed so that the Hamiltonian corresponds directly to a stabilizer for protecting quantum information. We demonstrate such a hardware implementation of stabilizers in a superconducting circuit composed of chains of π-periodic Josephson elements. With local on-chip flux and charge biasing, we observe a progressive softening of the energy band dispersion with respect to flux as the number of frustrated plaquette elements is increased, in close agreement with our numerical modeling.