# \#yao

**URL:** https://discourse.julialang.org/tag/yao/670.md

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## [Automatic differentiation with density matrix in yao](https://discourse.julialang.org/t/automatic-differentiation-with-density-matrix-in-yao/115467)

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**Author:** [@stone44](https://discourse.julialang.org/u/stone44)\
**Replies:** 9\
**Last updated:** [June 21, 2024, 12:21pm UTC](https://discourse.julialang.org/t/automatic-differentiation-with-density-matrix-in-yao/115467 "2024-06-21T12:21:47Z")

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Hey there, i am currently implementing a quantum variational algorithm, where my goal is to minimize a cost function, where i use a gradient based optimzer. Since i have no analytically closed form of my gradient, i am …

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## [How to create a single shared parameter for multiple gates within a circuit directly using Yao.jl?](https://discourse.julialang.org/t/how-to-create-a-single-shared-parameter-for-multiple-gates-within-a-circuit-directly-using-yao-jl/104648)

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**Author:** [@nethaji8](https://discourse.julialang.org/u/nethaji8)\
**Replies:** 3\
**Last updated:** [October 7, 2023, 5:10am UTC](https://discourse.julialang.org/t/how-to-create-a-single-shared-parameter-for-multiple-gates-within-a-circuit-directly-using-yao-jl/104648 "2023-10-07T05:10:32Z")

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I am trying to parameterize a circuit using a single variable θ in the code below but the output is: Number of parameters in the circuit: 4 . Can someone please help me create a single shared parameter for multiple g…

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## [\[ANN\] FLOYao.jl - Fermionic linear optics for Yao.jl](https://discourse.julialang.org/t/ann-floyao-jl-fermionic-linear-optics-for-yao-jl/87837)

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**Author:** [@jlbosse](https://discourse.julialang.org/u/jlbosse)\
**Replies:** 0\
**Last updated:** [September 26, 2022, 8:21pm UTC](https://discourse.julialang.org/t/ann-floyao-jl-fermionic-linear-optics-for-yao-jl/87837 "2022-09-26T20:21:28Z")

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FLOYao.jl Is a Yao.jl backend to efficiently simulated fermionic linear optics (FLO) circuits in based on Classical simulation of noninteracting-fermion quantum circuits and Disorder-assisted error correction in Majora…

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## [\[ANN\] IBMQClient.jl - the IBM Quantum Experience REST API wrapper in native Julia](https://discourse.julialang.org/t/ann-ibmqclient-jl-the-ibm-quantum-experience-rest-api-wrapper-in-native-julia/60566)

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**Author:** [@Roger-luo](https://discourse.julialang.org/u/Roger-luo)\
**Replies:** 0\
**Last updated:** [May 5, 2021, 10:28am UTC](https://discourse.julialang.org/t/ann-ibmqclient-jl-the-ibm-quantum-experience-rest-api-wrapper-in-native-julia/60566 "2021-05-05T10:28:21Z")

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I’m pleased to announce the IBM Q REST API wrapper in native Julia based on its official implementation in qiskit. https://github.com/QuantumBFS/IBMQClient.jl This is a component of the coming YaoLang.jl package, which…

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## [\[ANN\] OpenQASM.jl - the OpenQASM parser for Julia](https://discourse.julialang.org/t/ann-openqasm-jl-the-openqasm-parser-for-julia/60129)

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**Author:** [@Roger-luo](https://discourse.julialang.org/u/Roger-luo)\
**Replies:** 1\
**Last updated:** [April 27, 2021, 9:04pm UTC](https://discourse.julialang.org/t/ann-openqasm-jl-the-openqasm-parser-for-julia/60129 "2021-04-27T21:04:17Z")

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I’m excited to announce the OpenQASM parser in its 2.0 version: GitHub - QuantumBFS/OpenQASM.jl: Parsers and Tools for OpenQASM This package provides the functionality for parsing QASM scripts for Yao ecosystem, but you…