nkdsl.EmissionSpec¶

class EmissionSpec(update_program, amplitude, branch_tag=None, predicate=<factory>)[source]¶

One output branch (connected state + matrix element) of a term.

A single iterator evaluation can produce multiple branches, one per EmissionSpec in the parent term’s emissions tuple. This allows a plaquette term, for example, to emit both + and - connected states from the same site-tuple without splitting into two separate terms.

Parameters:

update_program (UpdateProgram)
amplitude (AmplitudeExpr)
branch_tag (Any)
predicate (PredicateExpr)

update_program¶

Site-update program mapping x -> x'.

Type:: nkdsl.ir.update.UpdateProgram

amplitude¶

Matrix-element expression evaluated in the source environment.

Type:: nkdsl.ir.expressions.AmplitudeExpr

branch_tag¶

Optional diagnostic tag for this emission slot.

Type:: Any

predicate¶

Optional emission-local branch predicate.

Type:: nkdsl.ir.predicates.PredicateExpr

__init__(update_program, amplitude, branch_tag=None, predicate=<factory>)¶

Parameters:

update_program (UpdateProgram)
amplitude (AmplitudeExpr)
branch_tag (Any)
predicate (PredicateExpr)

Return type:

None

Methods

__init__(update_program, amplitude[, ...])

Attributes

`branch_tag`
`matrix_element`	Preferred alias for `amplitude`.
`update_program`
`amplitude`
`predicate`