Bounded crosstalk noise

Purpose and scope

Proposes a small local model for interactions between overlapping neighboring operations. Matching uses overlap in a frozen timed plan, not adjacency of source lines.

Core design rules

• The initial scope is a closed coherent ZZ phase interaction on two distinct qubits.
• Profiles are exact-version immutable package exports; URLs, callbacks and inline matrices are rejected.
• Candidate matches are computed and bounded before allocating matrices.

Example from the original

This example illustrates the design recorded in the original. It is not by itself a claim of executable or stable support; check required options and the current version.

format: "nm-crosstalk-profile"
version: "0.1"
identity: package specifier, export, package digest, profile id
rules: ordered list of
  aggressor native gate
  victim native gate
  ordered aggressor/victim qubit selectors
  required target edge relation
  zzRadiansPerNanosecond
limitations: local sensitivity model, not calibration bound
integrity: sha256 over canonical artifact

Limits and interpretation

• A supplied coupling value does not establish that a physical device has that coupling.
• Leakage, pulse-level interaction, dynamic discovery and a larger backend are excluded.

Status and implementation boundary

The proposal depends on an approved NM-RFC-0018/0019 timed plan. Its review gate does not authorize implementation before approval; check current capability support separately.