sf.ops.CKgate¶
-
class
CKgate(kappa)[source]¶ Bases:
strawberryfields.ops.GateCross-Kerr gate.
\[CK(\kappa) = e^{i \kappa \hat{n}_1\hat{n}_2}\]Warning
The cross-Kerr gate is non-Gaussian, and thus can only be used in the Fock backends, not the Gaussian backend.
- Parameters
kappa (float) – parameter
Details and Conventions
Definition
The cross-Kerr interaction is given by the Hamiltonian
\[H = \hat{n}_1\hat{n_2}\]which is non-Gaussian and diagonal in the Fock basis.
We can therefore define the cross-Kerr gate, with parameter \(\kappa\) as
\[CK(\kappa) = \exp{(i\kappa\hat{n}_1\hat{n_2})}.\]Attributes
Returns a copy of the gate with the self.dagger flag flipped.
Extra dependencies due to parameters that depend on measurements.
-
H¶ Returns a copy of the gate with the self.dagger flag flipped.
H stands for hermitian conjugate.
- Returns
formal inverse of this gate
- Return type
Gate
-
measurement_deps¶ Extra dependencies due to parameters that depend on measurements.
- Returns
dependencies
- Return type
set[RegRef]
-
ns= 2¶
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 takes into account the special nature of p[0] and applies self.dagger.- Returns
Gates do not return anything, return value is None
- Return type
None
-
decompose(reg, **kwargs)¶ Decompose the operation into elementary operations supported by the backend API.
Like
Operation.decompose(), but applies self.dagger.
-
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