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Fix the number of equation for fidelity function gaussian_checks.py #397

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Merged
ziofil merged 3 commits into from
Oct 20, 2025
Merged

Fix the number of equation for fidelity function gaussian_checks.py #397

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432d5f9
Fix the number of equation for fidelity function gaussian_checks.py
gabrimoreira Apr 14, 2025
6deee76
Update thewalrus/quantum/gaussian_checks.py
ziofil Oct 20, 2025
c8924c1
Merge branch 'master' into gabrimoreira-patch-1
ziofil Oct 20, 2025
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4 changes: 2 additions & 2 deletions thewalrus/quantum/gaussian_checks.py
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Expand Up @@ -108,8 +108,8 @@ def fidelity(mu1, cov1, mu2, cov2, hbar=2, rtol=1e-05, atol=1e-08):
function reduces to the modulus square of the overlap of their state vectors.
For the derivation see `'Quantum Fidelity for Arbitrary Gaussian States', Banchi et al. <10.1103/PhysRevLett.115.260501>`_.

The actual implementation used here corresponds to the *square* of Eq. 96 of
`'Gaussian states and operations - a quick reference', Brask <https://arxiv.org/abs/2102.05748>`_.
The actual implementation used here corresponds to the *square* of Eq. 112 of
`'Gaussian states and operations - a quick reference', Brask <https://arxiv.org/abs/2102.05748v2>`_. This equation can be used for mixed and pure states.

Args:
mu1 (array): vector of means of the first state
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