# Mr Mustard **URL:** https://discuss.pennylane.ai/c/photonic-software/mr-mustard/20.md [Latest](https://discuss.pennylane.ai/latest.md) · [Categories](https://discuss.pennylane.ai/categories.md) --- ## [About the Mr Mustard category](https://discuss.pennylane.ai/t/about-the-mr-mustard-category/2944)
**Author:** [@isaacdevlugt](https://discuss.pennylane.ai/u/isaacdevlugt)\ **Replies:** 6\ **Last updated:** [March 5, 2026, 2:23am UTC](https://discuss.pennylane.ai/t/about-the-mr-mustard-category/2944 "2026-03-05T02:23:30Z")
For all posts related to Mr Mustard, the differentiable simulator with a sophisticated built-in optimizer, that operates seamlessly across phase space and Fock space. This includes usage, help, and development. See the M… --- ## [MrMustard for GKP state preparation](https://discuss.pennylane.ai/t/mrmustard-for-gkp-state-preparation/9401)
**Author:** [@Amanuel](https://discuss.pennylane.ai/u/Amanuel)\ **Replies:** 4\ **Last updated:** [July 14, 2026, 12:44am UTC](https://discuss.pennylane.ai/t/mrmustard-for-gkp-state-preparation/9401 "2026-07-14T00:44:56Z")
Hello are there tutorials available for performing non-Gaussian state preparation with a GBS device using the latest version of the MrMustard library? I am trying to investigate the capabilities of MrMustard for heraldin… --- ## [Polarization and OAM](https://discuss.pennylane.ai/t/polarization-and-oam/9222)
**Author:** [@apple\_jay](https://discuss.pennylane.ai/u/apple_jay)\ **Replies:** 6\ **Last updated:** [February 4, 2026, 11:21pm UTC](https://discuss.pennylane.ai/t/polarization-and-oam/9222 "2026-02-04T23:21:21Z")
Hello, I’ve been looking at the gates with Mr Mustard and I was wondering how changes in polarizations can be can be done or see if there was any guidance on how to apply orbital angular momentum for a light beam --- ## [Mr Mustard trainer issue with backend](https://discuss.pennylane.ai/t/mr-mustard-trainer-issue-with-backend/7747)
**Author:** [@Rahps97](https://discuss.pennylane.ai/u/Rahps97)\ **Replies:** 3\ **Last updated:** [December 21, 2024, 12:31am UTC](https://discuss.pennylane.ai/t/mr-mustard-trainer-issue-with-backend/7747 "2024-12-21T00:31:14Z")
Hi I am trying to run the map\_trainer example, got following error: --------------------------------------------------------------------------- RayTaskError(TypeError) Traceback (most recent call last) Cell In\[1\], line… --- ## [How to use Kerr like non-linear gates in Mr. Mustard?](https://discuss.pennylane.ai/t/how-to-use-kerr-like-non-linear-gates-in-mr-mustard/7623)
**Author:** [@Rahps97](https://discuss.pennylane.ai/u/Rahps97)\ **Replies:** 1\ **Last updated:** [November 21, 2024, 10:46pm UTC](https://discuss.pennylane.ai/t/how-to-use-kerr-like-non-linear-gates-in-mr-mustard/7623 "2024-11-21T22:46:49Z")
I am not sure if this functionality exists, but I would be happy to have it. I am trying to implement CV-QNN using Mr. Mustard. --- ## [Beam Splitter (BS)](https://discuss.pennylane.ai/t/beam-splitter-bs/4641)
**Author:** [@Antonio\_Aguiar](https://discuss.pennylane.ai/u/Antonio_Aguiar)\ **Replies:** 14\ **Last updated:** [June 11, 2024, 10:36pm UTC](https://discuss.pennylane.ai/t/beam-splitter-bs/4641 "2024-06-11T22:36:14Z")
Hey, good morning. I’m having difficulty implementing a beam splitter whose inputs receive alpha and -alpha coherent states, for example. How do I set the input state (alpha or -alpha) to interfere with the BS? Is it po… --- ## [How to generate amber force feilds for protein or Ligand? in Guassain or any other software like Chimera](https://discuss.pennylane.ai/t/how-to-generate-amber-force-feilds-for-protein-or-ligand-in-guassain-or-any-other-software-like-chimera/4069)
**Author:** [@Ariha](https://discuss.pennylane.ai/u/Ariha)\ **Replies:** 1\ **Last updated:** [February 13, 2024, 10:47pm UTC](https://discuss.pennylane.ai/t/how-to-generate-amber-force-feilds-for-protein-or-ligand-in-guassain-or-any-other-software-like-chimera/4069 "2024-02-13T22:47:51Z")
i want to generate Amber force feild of protein for oniom calculations in guassain but it fails can anyone tell how to generate amber force filed with the help of Chimera or Guassain. --- ## [Mistake in Tutorial](https://discuss.pennylane.ai/t/mistake-in-tutorial/3829)
**Author:** [@samuel](https://discuss.pennylane.ai/u/samuel)\ **Replies:** 1\ **Last updated:** [December 19, 2023, 10:50pm UTC](https://discuss.pennylane.ai/t/mistake-in-tutorial/3829 "2023-12-19T22:50:14Z")
In Executing programs on X8 devices — Strawberry Fields In Section Executing Jobs under creating a 8 mode quantum program: The following line of code is missing: ops.S2gate | (q\[2\], q\[6\]) --- ## [Implementation of a network of interconnected beamsplitters for coherent state evolution](https://discuss.pennylane.ai/t/implementation-of-a-network-of-interconnected-beamsplitters-for-coherent-state-evolution/2949)
**Author:** [@Antonio\_Aguiar](https://discuss.pennylane.ai/u/Antonio_Aguiar)\ **Replies:** 4\ **Last updated:** [May 18, 2023, 5:39pm UTC](https://discuss.pennylane.ai/t/implementation-of-a-network-of-interconnected-beamsplitters-for-coherent-state-evolution/2949 "2023-05-18T17:39:28Z")
Hi good morning dear colleagues, I am trying to evolve a system with six coherent states as input to three beamsplitters and I am facing the following errors described in the images below. How would I make this system ev…