Hi,

I was wondering if I can prepare a superposition of coherent (or squeezed) state, i.e. cat state, along with single photon Fock state to be applied to a passive interferometer. Thanks in advance

Hi,

I was wondering if I can prepare a superposition of coherent (or squeezed) state, i.e. cat state, along with single photon Fock state to be applied to a passive interferometer. Thanks in advance

Hi @ekccagin!

Assuming your desired initial state is |\psi\rangle = |\mathrm{cat}(\alpha)\rangle \otimes |1\rangle, you can prepare it with the `sf.ops.Catstate`

and `sf.ops.Fock`

operations and then apply your interferometer in the following way

```
import strawberryfields as sf
from strawberryfields.ops import *
prog = sf.Program(2)
alpha = 1+0.5j
a = np.abs(alpha)
phi = np.angle(alpha)
U = ... # unitary of your interferometer here
with prog.context as q:
# prepare initial states
Catstate(a, phi) | q[0]
Fock(1) | q[1]
# apply interferometer
Interferometer(U) | q
eng = sf.Engine('fock', backend_options={'cutoff_dim': 15})
result = eng.run(prog, shots=1)
```

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