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Tailoring surface codes for highly biased noise
David K. Tuckett, Andrew S. Darmawan, Christopher T. Chubb +3
The surface code, with a simple modification, exhibits ultra-high error correction thresholds when the noise is biased towards dephasing. Here, we identify features of the surface…
Stochastic Estimation of Dynamical Variables
Stefan Krastanov, Sisi Zhou, Steven T. Flammia +1
Estimating the parameters governing the dynamics of a system is a prerequisite for its optimal control. We present a simple but powerful method that we call STEADY, for STochastic…
Statistical mechanical models for quantum codes with correlated noise
Christopher T. Chubb, Steven T. Flammia
We give a broad generalisation of the mapping, originally due to Dennis, Kitaev, Landahl and Preskill, from quantum error correcting codes to statistical mechanical models. We show…
Fault-Tolerant Logical Gates in the IBM Quantum Experience
Robin Harper, Steven T. Flammia
Quantum computers will require encoding of quantum information to protect them from noise. Fault-tolerant quantum computing architectures illustrate how this might be done but have…
Performance of quantum error correction with coherent errors
Eric Huang, Andrew C. Doherty, Steven Flammia
We compare the performance of quantum error correcting codes when memory errors are unitary with the more familiar case of dephasing noise. For a wide range of codes we analyticall…