REVIEW 5 cited by
Non-degenerate noise-resilient superconducting qubit
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We propose a superconducting qubit based on engineering the first and second harmonics of the Josephson energy and phase relation $E_{J1}\cos \varphi$ and $E_{J2}\cos 2\varphi$. By constructing a circuit such that $E_{J2}$ is negative and $|E_{J1}| \ll |E_{J2}|$, we create a periodic potential with two non-degenerate minima. The qubit, which we dub "harmonium", is formed from the lowest-energy states of each minimum. Bit-flip protection of the qubit arises due to the localization of each qubit state to their respective minima, while phase-flip protection can be understood by considering the circuit within the Born-Oppenheimer approximation. We demonstrate with time-domain simulations that single- and two-qubit gates can be performed in approximately one hundred nanoseconds. Finally, we compute the qubit coherence times using numerical diagonalization of the complete circuit in conjunction with state-of-the-art noise models. We estimate out-of-manifold heating times on the order of milliseconds, which can be treated as erasure errors using conventional dispersive readout. We estimate pure-dephasing times on the order of many tens of milliseconds, and bit-flip times on the order of seconds.
Forward citations
Cited by 5 Pith papers
-
The Arm Qubit: A Superconducting Qubit Co-Designed for Coherence and Coupling
A simulated two-mode 'arm qubit' design predicts a 17 ns CZ gate with error below 1e-4, a 27 ns readout with error 1e-4, and low crosstalk, all without a Purcell filter.
-
Protected measurements for protected superconducting qubits
Protected Z and X measurements of the 0-pi qubit are proposed, with exponentially suppressed errors via GKP-state encoding and charge-parity mapping.
-
Temperature and Magnetic-Field Dependence of Energy Relaxation in a Fluxonium Qubit
In a low-frequency fluxonium qubit, flux noise grows approximately linearly with temperature and dielectric-loss charge noise grows as T^3, while weak in-plane magnetic fields increase dielectric loss.
-
Cross-Resonant Gates in Hybrid Fluxonium-Transmon Systems
A simulation study shows that cross-resonance CNOT gates between fluxoniums and a central transmon support high-fidelity parity checks and logical gates in a scalable dual-species architecture.
-
Leveraging biased noise for more efficient quantum error correction at the circuit-level with two-level qubits
Bias-preserving CZ gates plus small residual CNOT bias enable a 90% threshold improvement and up to 75% footprint reduction for the XZZX code in two-level qubits.
Discussion (0). Sign in to comment.