sf.ops.MeasureThreshold

class MeasureThreshold(select=None)

Bases: strawberryfields.ops.Measurement

Measures a set of modes with thresholded Fock-state measurements, i.e., measuring whether a mode contain zero or nonzero photons.

After measurement, the modes are reset to the vacuum state.

Attributes

measurement_deps	Extra dependencies due to parameters that depend on measurements.
ns

measurement_deps

Extra dependencies due to parameters that depend on measurements.

Returns

dependencies

Return type

set[RegRef]

ns = None

Methods

apply(reg, backend, **kwargs)	Ask a backend to execute the operation on the current register state right away.
decompose(reg, **kwargs)	Decompose the operation into elementary operations supported by the backend API.
merge(other)	Merge the operation with another (acting on the exact same set of subsystems).

apply(reg, backend, **kwargs)

Ask a backend to execute the operation on the current register state right away.

Like Operation.apply(), but also stores the measurement result in the RegRefs.

Keyword Arguments

shots (int) – Number of independent evaluations to perform. Only applies to Measurements.

decompose(reg, **kwargs)

Decompose the operation into elementary operations supported by the backend API.

See strawberryfields.backends.base.

Parameters

reg (Sequence[RegRef]) – subsystems the operation is acting on

Returns

decomposition as a list of operations acting on specific subsystems

Return type

list[Command]

merge(other)

Merge the operation with another (acting on the exact same set of subsystems).

Note

For subclass overrides: merge may return a newly created object, or self, or other, but it must never modify self or other because the same Operation objects may be also used elsewhere.

Parameters

other (Operation) – operation to merge this one with

Returns

other * self. The return value None represents the identity gate (doing nothing).

Return type

Operation, None

Raises

MergeFailure – if the two operations cannot be merged

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