# Quantum

**URL:** https://discourse.julialang.org/c/domain/quantum/52.md?page=1

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 2

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## [Live-streamed and recorded seminar "Julia for Materials Modelling"](https://discourse.julialang.org/t/live-streamed-and-recorded-seminar-julia-for-materials-modelling/99264)

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**Author:** [@mfh](https://discourse.julialang.org/u/mfh)\
**Replies:** 2\
**Last updated:** [August 31, 2023, 1:54pm UTC](https://discourse.julialang.org/t/live-streamed-and-recorded-seminar-julia-for-materials-modelling/99264 "2023-08-31T13:54:35Z")

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Dear all I’ll do a (live-streamed) seminar “Julia for Materials Modelling” tomorrow at 3pm CEST — with basically the focus on the current state of Julia for atomistic materials modelling. See Julia for Materials Modelli…

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## [Quantum operator algebra of creation and annhilation operators of fermions](https://discourse.julialang.org/t/quantum-operator-algebra-of-creation-and-annhilation-operators-of-fermions/102017)

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**Author:** [@That\_ind](https://discourse.julialang.org/u/That_ind)\
**Replies:** 6\
**Last updated:** [July 24, 2023, 3:17pm UTC](https://discourse.julialang.org/t/quantum-operator-algebra-of-creation-and-annhilation-operators-of-fermions/102017 "2023-07-24T15:17:04Z")

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Is there any package that does quantum operator algebra (i.e., algebra with non-commuting operators) in Julia? I need to calculate numerous commutators of fermions, so I hope the package can do the job with small time an…

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## [QHack has started](https://discourse.julialang.org/t/qhack-has-started/94574)

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**Author:** [@kslimes](https://discourse.julialang.org/u/kslimes)\
**Replies:** 0\
**Last updated:** [February 13, 2023, 4:22pm UTC](https://discourse.julialang.org/t/qhack-has-started/94574 "2023-02-13T16:22:05Z")

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Read the introductory blog post here! QHack is a free event running from February 13-28 2023, featuring scientific talks and a hackathon with multiple challenges. You can still sign up (for free!) to participate and it’…

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## [Hiring Quantum Information Science Julia programmers (cross-post)](https://discourse.julialang.org/t/hiring-quantum-information-science-julia-programmers-cross-post/93098)

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**Author:** [@Krastanov](https://discourse.julialang.org/u/Krastanov)\
**Replies:** 0\
**Last updated:** [January 17, 2023, 2:28pm UTC](https://discourse.julialang.org/t/hiring-quantum-information-science-julia-programmers-cross-post/93098 "2023-01-17T14:28:48Z")

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A cross-post for the Julia Quantum hackers that do not peruse the job board of this forum. We (The NSF Center for Quantum Networks and UMass Amherst) are hiring people interested in high-fidelity simulations of quantum …

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## [\[ANN\] BosonSampling.jl - A package for multiphoton interference](https://discourse.julialang.org/t/ann-bosonsampling-jl-a-package-for-multiphoton-interference/91891)

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**Author:** [@benoitseron](https://discourse.julialang.org/u/benoitseron)\
**Replies:** 0\
**Last updated:** [December 20, 2022, 9:45am UTC](https://discourse.julialang.org/t/ann-bosonsampling-jl-a-package-for-multiphoton-interference/91891 "2022-12-20T09:45:38Z")

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I am pleased to announce BosonSampling.jl, a free open source package for high performance simulation and numerical investigation of boson samplers and, more generally, multi-photon interferometry. Underlying building b…

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## [An outer-product in Yao?](https://discourse.julialang.org/t/an-outer-product-in-yao/89543)

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**Author:** [@BoltzmannEntropy](https://discourse.julialang.org/u/BoltzmannEntropy)\
**Replies:** 5\
**Last updated:** [October 31, 2022, 12:52pm UTC](https://discourse.julialang.org/t/an-outer-product-in-yao/89543 "2022-10-31T12:52:17Z")

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Hello, I am trying to evaluate the following expression: I3 + ψ\*ψ' First, is there a way in Yao to create an arbitrary sized Identity matrix like I3? using Yao, YaoPlots using YaoBlocks: eigenbasis ψ=ArrayReg(bit"11…

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## [Introductory book recommendations](https://discourse.julialang.org/t/introductory-book-recommendations/45066)

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**Author:** [@anon37204545](https://discourse.julialang.org/u/anon37204545)\
**Replies:** 5\
**Last updated:** [October 17, 2022, 8:11am UTC](https://discourse.julialang.org/t/introductory-book-recommendations/45066 "2022-10-17T08:11:04Z")

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I’m looking for good textbooks about quantum computing, quantum informatics and quantum biology. Any PDF availabe online for free is acceptable. Do you have any recommendations? Preferrably, they should be at introducto…

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## [How to run noisy circuits in \`Yao.jl\`](https://discourse.julialang.org/t/how-to-run-noisy-circuits-in-yao-jl/81775)

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**Author:** [@jlbosse](https://discourse.julialang.org/u/jlbosse)\
**Replies:** 6\
**Last updated:** [June 1, 2022, 4:53pm UTC](https://discourse.julialang.org/t/how-to-run-noisy-circuits-in-yao-jl/81775 "2022-06-01T16:53:04Z")

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I want to run simulations of noisy circuits (e.g. with a random Pauli error \[I, X, Y, Z\] with weights \[1-3p, p, p, p\] after each gate) in Yao.jl. My first thought was to use full density matrix simulations, but it seems…

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## [DFTK school 2022](https://discourse.julialang.org/t/dftk-school-2022/73497)

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**Author:** [@mfh](https://discourse.julialang.org/u/mfh)\
**Replies:** 6\
**Last updated:** [May 19, 2022, 5:17am UTC](https://discourse.julialang.org/t/dftk-school-2022/73497 "2022-05-19T05:17:17Z")

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Hi everyone! From 29 to 31 Aug 2022 @antoine-levitt, Eric Cancès (from École des Ponts in Paris) and myself, we will organize an interdisciplinary summer school centred around electronic-structure simulations and method…

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## [Inconsistent results between Yao and Qiskit](https://discourse.julialang.org/t/inconsistent-results-between-yao-and-qiskit/63363)

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**Author:** [@rmedinar](https://discourse.julialang.org/u/rmedinar)\
**Replies:** 4\
**Last updated:** [May 4, 2022, 3:27pm UTC](https://discourse.julialang.org/t/inconsistent-results-between-yao-and-qiskit/63363 "2022-05-04T15:27:56Z")

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Hi everyone. I have been trying to simulate the growth of entanglement entropy in random unitary circuits using Yao for a while now. When comparing with old results from my Qiskit code I found out about some inconsistenc…

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## [Computing a linear combination of all reduced density matrices of a given pure state](https://discourse.julialang.org/t/computing-a-linear-combination-of-all-reduced-density-matrices-of-a-given-pure-state/72070)

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**Author:** [@rmedinar](https://discourse.julialang.org/u/rmedinar)\
**Replies:** 10\
**Last updated:** [May 4, 2022, 3:25pm UTC](https://discourse.julialang.org/t/computing-a-linear-combination-of-all-reduced-density-matrices-of-a-given-pure-state/72070 "2022-05-04T15:25:09Z")

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Hi all! I have been struggling for a while on the following calculation: (For the simulations, I’m using Yao) Imagine you are given a pure state \\psi of N qubits. And you want to compute where A runs over all subreg…

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## [Quantum optics - expansion of functions to composite bases](https://discourse.julialang.org/t/quantum-optics-expansion-of-functions-to-composite-bases/69413)

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**Author:** [@natan.granit](https://discourse.julialang.org/u/natan.granit)\
**Replies:** 0\
**Last updated:** [October 8, 2021, 6:29am UTC](https://discourse.julialang.org/t/quantum-optics-expansion-of-functions-to-composite-bases/69413 "2021-10-08T06:29:00Z")

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I’m using a composite fock basis in the Quantum optics pkg and I wanted to use the following functions: \[ QuantumOpticsBase.transform \] API · QuantumOptics.jl \[ QuantumOpticsBase.qfunc \] API · QuantumOptics.jl \[ Quan…

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## [Quantum clustering algorithm in Julia](https://discourse.julialang.org/t/quantum-clustering-algorithm-in-julia/65061)

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**Author:** [@j\_u](https://discourse.julialang.org/u/j_u)\
**Replies:** 2\
**Last updated:** [August 23, 2021, 3:56pm UTC](https://discourse.julialang.org/t/quantum-clustering-algorithm-in-julia/65061 "2021-08-23T15:56:32Z")

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Hi, Is there any example of quantum clustering algorithm written in Julia? Ideally something that is automatically determining number of clusters? This is my first step into quantum computing so I hope the question is …

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## [Inconsitency in matrix multiplication](https://discourse.julialang.org/t/inconsitency-in-matrix-multiplication/66193)

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**Author:** [@Joseph\_S\_Rebeirro](https://discourse.julialang.org/u/Joseph_S_Rebeirro)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 12:40pm UTC](https://discourse.julialang.org/t/inconsitency-in-matrix-multiplication/66193 "2021-08-11T12:40:27Z")

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Hi All, I was playing with the Quantum optics package and I saw something weird So the resulting matrix is inconsistent in comparison with other CAS systems (Mathematica) Mathematica: # Spin operators Sx = 1/Sq…

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## [How do I create a Quantum Time Operator with DifferentialEquations?](https://discourse.julialang.org/t/how-do-i-create-a-quantum-time-operator-with-differentialequations/65766)

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**Author:** [@Noel\_Araujo](https://discourse.julialang.org/u/Noel_Araujo)\
**Replies:** 3\
**Last updated:** [August 5, 2021, 12:20pm UTC](https://discourse.julialang.org/t/how-do-i-create-a-quantum-time-operator-with-differentialequations/65766 "2021-08-05T12:20:21Z")

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For the special case of unitary matrices, my quantum mechanics books tells me to use Time Evolution Operators. β(t) = exp(-im\*H\*t/h)\*β(0) As far I know, I just need to use Matrix Exponential. First, decompose H = ψ\*λ\*…

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## [\[ANN\] AWSBraket.jl - REST API wrapper for AWS Quantum Computing Service in native Julia](https://discourse.julialang.org/t/ann-awsbraket-jl-rest-api-wrapper-for-aws-quantum-computing-service-in-native-julia/64608)

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**Author:** [@Roger-luo](https://discourse.julialang.org/u/Roger-luo)\
**Replies:** 2\
**Last updated:** [July 14, 2021, 5:24pm UTC](https://discourse.julialang.org/t/ann-awsbraket-jl-rest-api-wrapper-for-aws-quantum-computing-service-in-native-julia/64608 "2021-07-14T17:24:26Z")

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I’m pleased to announce the AWS braket REST API wrapper in native Julia based on its official implementation in braket. This is a component of the coming YaoLang.jl package, which will be the recommended way of using …

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## [Real quantum device/noisy simulations](https://discourse.julialang.org/t/real-quantum-device-noisy-simulations/62538)

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**Author:** [@rodpiferreira](https://discourse.julialang.org/u/rodpiferreira)\
**Replies:** 11\
**Last updated:** [June 15, 2021, 10:37pm UTC](https://discourse.julialang.org/t/real-quantum-device-noisy-simulations/62538 "2021-06-15T22:37:06Z")

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Hello everyone! I’ve recently learned about YaoQuantum, and I began to use it to solve differential equations via quantum algorithms. Although the results were quite interesting, I would like to perform the same simulat…

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## [How to compute gradient with respect to a circuit parameter?](https://discourse.julialang.org/t/how-to-compute-gradient-with-respect-to-a-circuit-parameter/61706)

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**Author:** [@rmedinar](https://discourse.julialang.org/u/rmedinar)\
**Replies:** 6\
**Last updated:** [June 13, 2021, 1:21pm UTC](https://discourse.julialang.org/t/how-to-compute-gradient-with-respect-to-a-circuit-parameter/61706 "2021-06-13T13:21:33Z")

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Hi everyone! I’m trying to compute the gradient with respect to a certain circuit parameter and I would like to do it efficiently. I know there exist several efficient methods for this in Yao, i.e., faithful\_grad() and …

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## [Unsatisfiable for CUDA](https://discourse.julialang.org/t/unsatisfiable-for-cuda/52355)

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**Author:** [@basernapairs](https://discourse.julialang.org/u/basernapairs)\
**Replies:** 1\
**Last updated:** [June 11, 2021, 7:38pm UTC](https://discourse.julialang.org/t/unsatisfiable-for-cuda/52355 "2021-06-11T19:38:43Z")

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I want to try Yao quantum, but CUDA unsatisfiable me

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## [Physics World Quantum Week](https://discourse.julialang.org/t/physics-world-quantum-week/62721)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 0\
**Last updated:** [June 11, 2021, 7:39am UTC](https://discourse.julialang.org/t/physics-world-quantum-week/62721 "2021-06-11T07:39:56Z")

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Physics World magazine is organising a week of Quantum themed webinars. (scroll down the page a little)

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## [Simulating quantum circuits with Yao](https://discourse.julialang.org/t/simulating-quantum-circuits-with-yao/61390)

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**Author:** [@rmedinar](https://discourse.julialang.org/u/rmedinar)\
**Replies:** 4\
**Last updated:** [May 20, 2021, 8:58am UTC](https://discourse.julialang.org/t/simulating-quantum-circuits-with-yao/61390 "2021-05-20T08:58:34Z")

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Hi there! I’m new in the Julia ecosystems and my first project is trying to simulate a particular random circuit using Yao. My issue at the moment is basically the efficiency of code which seems to be quite slow. I would…

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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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## [\[ANN\] Quantikz.jl v1 for drawing circuits (including in-browser demos)](https://discourse.julialang.org/t/ann-quantikz-jl-v1-for-drawing-circuits-including-in-browser-demos/59911)

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**Author:** [@Krastanov](https://discourse.julialang.org/u/Krastanov)\
**Replies:** 0\
**Last updated:** [April 24, 2021, 1:55am UTC](https://discourse.julialang.org/t/ann-quantikz-jl-v1-for-drawing-circuits-including-in-browser-demos/59911 "2021-04-24T01:55:32Z")

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Demo at quantikz.krastanov.org. Library at github.com/Krastanov/Quantikz. Quantikz.jl now supports qubits, ancillas, classical bits, and arbitrary gates and measurements, conditional or not on both qubits and classical …

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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…

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## [QBase.jl v0.2.0 Release](https://discourse.julialang.org/t/qbase-jl-v0-2-0-release/59962)

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**Author:** [@bdoolittle](https://discourse.julialang.org/u/bdoolittle)\
**Replies:** 6\
**Last updated:** [April 27, 2021, 2:20pm UTC](https://discourse.julialang.org/t/qbase-jl-v0-2-0-release/59962 "2021-04-27T14:20:57Z")

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Hi Everyone, I’m excited to introduce QBase.jl as a base library for quantum information. The goal of QBase.jl is to provide a lightweight computational framework for quantum mechanics. This Julia package provides: V…

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## [Nonlinear Schrodinger equation/quantumoptics.jl](https://discourse.julialang.org/t/nonlinear-schrodinger-equation-quantumoptics-jl/57436)

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**Author:** [@narayan](https://discourse.julialang.org/u/narayan)\
**Replies:** 4\
**Last updated:** [March 30, 2021, 1:13pm UTC](https://discourse.julialang.org/t/nonlinear-schrodinger-equation-quantumoptics-jl/57436 "2021-03-30T13:13:10Z")

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I saw in the documentation of quantumoptics.jl that it can simulate Spin F=1 spinor BEC which is basically three nonlinear coupled partial differential equations. I am wondering whether there is a way to solve GP equatio…

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## [Implementing the hydrogen atom?](https://discourse.julialang.org/t/implementing-the-hydrogen-atom/57455)

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**Author:** [@volkerkarle](https://discourse.julialang.org/u/volkerkarle)\
**Replies:** 0\
**Last updated:** [March 18, 2021, 10:15am UTC](https://discourse.julialang.org/t/implementing-the-hydrogen-atom/57455 "2021-03-18T10:15:27Z")

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Hi folks, Is there a package dealing with problems from atomic physics i.e. an implementation of the hydrogen wave function, relativistic corrections etc. ? I know there is UnitfulAtomic.jl, but that is only for the cor…

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## [QuantumClifford.jl for efficient simulation of Clifford circuits](https://discourse.julialang.org/t/quantumclifford-jl-for-efficient-simulation-of-clifford-circuits/52236)

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**Author:** [@Krastanov](https://discourse.julialang.org/u/Krastanov)\
**Replies:** 1\
**Last updated:** [December 22, 2020, 6:52pm UTC](https://discourse.julialang.org/t/quantumclifford-jl-for-efficient-simulation-of-clifford-circuits/52236 "2020-12-22T18:52:40Z")

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This is a crosspost of the announcement of QuantumClifford.jl in the community thread. You can read there for more details of a small package with efficient allocation free algorithms for the simulation of circuits with …

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## [Help with the implementation of Deutsch Algorithm using Yao.jl](https://discourse.julialang.org/t/help-with-the-implementation-of-deutsch-algorithm-using-yao-jl/45384)

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**Author:** [@ChetanVardhan](https://discourse.julialang.org/u/ChetanVardhan)\
**Replies:** 3\
**Last updated:** [October 20, 2020, 8:43pm UTC](https://discourse.julialang.org/t/help-with-the-implementation-of-deutsch-algorithm-using-yao-jl/45384 "2020-10-20T20:43:17Z")

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Need help implementing the oracle from Deutsch’s Algorithm in Yao.jl Anyone has any ideas on how to do this? Any type of help will be appreciated

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## [Is QuantumLab.jl abandoned?](https://discourse.julialang.org/t/is-quantumlab-jl-abandoned/33136)

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**Author:** [@XVilka](https://discourse.julialang.org/u/XVilka)\
**Replies:** 18\
**Last updated:** [July 31, 2020, 4:51pm UTC](https://discourse.julialang.org/t/is-quantumlab-jl-abandoned/33136 "2020-07-31T16:51:37Z")

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There is a quantum chemistry and physics framework called QuantumLab.jl, but It seems there are no updates for a while, and it doesn’t work with the latest Julia and libraries. Does anyone know if there are any alternat…

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