Kavli Affiliate: Ke Wang
| First 5 Authors: Bingcheng Qing, Ahmed Hajr, Ke Wang, Gerwin Koolstra, Long B. Nguyen
| Summary:
The ubiquitous noise in quantum system hinders the advancement of quantum
information processing and has driven the emergence of different
hardware-efficient quantum error correction protocols. Among them, qubits with
structured noise, especially with biased noise, are one of the most promising
platform to achieve fault-tolerance due to the high error thresholds of quantum
error correction codes tailored for them. Nevertheless, their quantum
operations are challenging and the demonstration of their performance beyond
the fault-tolerant threshold remain incomplete. Here, we leverage Schr"odinger
cat states in a scalable planar superconducting nonlinear oscillator to
thoroughly characterize the high-fidelity single-qubit quantum operations with
systematic quantum tomography and benchmarking tools, demonstrating the
state-of-the-art performance of operations crossing the fault-tolerant
threshold of the XZZX surface code. These results thus embody a transformative
milestone in the exploration of quantum systems with structured error channels.
Notably, our framework is extensible to other types of structured-noise
systems, paving the way for systematic characterization and validation of novel
quantum platforms with structured noise.
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