DualYbSim

A noise model for dual-isotope ytterbium neutral-atom qubits, packaged as a wrapper around Stim. Give it an ideal Clifford circuit and a description of which atom each qubit is; get back the same circuit with physically-motivated noise inserted, ready for detector sampling and decoding.

These pages are the reference documentation. For installation, usage and the test suite, see the README.

The processor model

The model covers a processor built from 171Yb and 174Yb:

• 174Yb as an optical clock qubit, |0> = |g> (1S0), |1> = |m> (3P0)
• 171Yb-g, a nuclear-spin qubit in the 1S0 ground manifold
• 171Yb-m, a nuclear-spin qubit in the 3P0 metastable manifold

Noise is defined as Kraus operators on the full multi-level Hilbert space — including the Rydberg state |r> and an effective loss state |L> — and then reduced to Pauli plus loss channels by the generalised Pauli twirling approximation, so it can be simulated as a stabiliser circuit.

Reference

• Channel reference — every noise channel, what it models, and which Kraus class provides it.
• Parameter reference — every parameter, both presets’ values, and the file format.
• Channel ordering — the order channels are composed in, per operation.

Alongside these, examples/noise_channel_tour.ipynb reads the same rules off real circuits: every operation, for every encoding, with the emitted channels annotated line by line.

Status

Pre-1.0, and the accompanying paper is still in preparation, so both the public API and the tabulated parameter values may change. Released under the MIT licence; see CONTRIBUTING.md if you would like to help.

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