Swap test in using CV

Photonic Software Strawberry Fields
3

Hi Mr @nathan,
I’m sorry i didn’t provide any code :frowning:.

import strawberryfields as sf
from strawberryfields.ops import *
import numpy as np
sf.__version__  
>> '0.12.1'

#### create random points

    x1 = 1
x2 = 0

eng = sf.Engine(
    backend="fock",
    backend_options={"cutoff_dim": 8,'shots':5000}
)
dist = sf.Program(4)

with dist.context as q:

    Fock(1) |q[0]
    Vacuum() | q[1]
    
    Dgate(a=x1) | q[2]
    Dgate(a=x2) | q[3]
    
    BSgate() | (q[0],q[1])
    BSgate() | (q[2],q[3])
    
    CZgate(np.pi) | (q[1],q[3])
    
    BSgate() | (q[0],q[1])
    BSgate() | (q[2],q[3])
    
    MeasureFock() | q[0]
    MeasureFock() | q[1]

results = eng.run(dist)
print(results.samples)

>> [0, 0, None, None]

I implemented this figure:
image

I just want to know if I’m correct with my code and also how I can interpret the outcome as stated in the paper. I also want to know why the number of the samples is just one and I set the shots to 5000

sorry for not including the code from the beginning and I hope that the coronavirus situation is not bad at your place.