Before posting a bug report
Expected behavior
BaseGaussianState.dm() doesn't preserve locality dimensions. The Fock basis backend and Gaussian backend should give the same results.
Actual behavior
state.dm() gives gives only 2 dimensional matricies. The Fock basis state gives a multi-index object depending on the number of modes.
Reproduces how often
Always
System information
>>> sf.about()
Strawberry Fields: a Python library for continuous-variable quantum circuits.
Copyright 2018-2020 Xanadu Quantum Technologies Inc.
Python version: 3.10.5
Platform info: Linux-5.18.12-arch1-1-x86_64-with-glibc2.35
Installation path: /home/lund/.local/lib/python3.10/site-packages/strawberryfields
Strawberry Fields version: 0.23.0
Numpy version: 1.22.4
Scipy version: 1.8.1
SymPy version: 1.10.1
NetworkX version: 2.8.5
The Walrus version: 0.19.0
Blackbird version: 0.4.0
XCC version: 0.2.1
TensorFlow version: None
Source code
import strawberryfields as sf
import strawberryfields.ops as op
p = sf.Program(2)
with p.context as q:
op.Squeezed(1) | q[0]
e = sf.Engine('fock', backend_options={'cutoff_dim': 4})
r = e.run(p)
print(f"Fock engine density matrix shape {r.state.dm().shape}")
e = sf.Engine('gaussian')
r = e.run(p)
print(f"Gaussian engine density matrix shape {r.state.dm(cutoff=4).shape}")Tracebacks
No response
Additional information
No response
Before posting a bug report
Expected behavior
BaseGaussianState.dm() doesn't preserve locality dimensions. The Fock basis backend and Gaussian backend should give the same results.
Actual behavior
state.dm() gives gives only 2 dimensional matricies. The Fock basis state gives a multi-index object depending on the number of modes.
Reproduces how often
Always
System information
Source code
import strawberryfields as sf import strawberryfields.ops as op p = sf.Program(2) with p.context as q: op.Squeezed(1) | q[0] e = sf.Engine('fock', backend_options={'cutoff_dim': 4}) r = e.run(p) print(f"Fock engine density matrix shape {r.state.dm().shape}") e = sf.Engine('gaussian') r = e.run(p) print(f"Gaussian engine density matrix shape {r.state.dm(cutoff=4).shape}")Tracebacks
No response
Additional information
No response