PragProg Customers

Quantum Computing: NOT gate equivalent (page 205)

jakobheitz

jakobheitz

Quantum Computing: NOT gate equivalent (page 205)

@nihal.mehta
Stated: The NOT (X) gate is equivalent to the U3(pi, pi, 0, ) gate.
I tried that in the U3 matrix, but I got a different result. Should it be U3(pi, 0, pi) ?

BTW, I really like your book. Your style of explanation, especially with the qubelets works well for me. Then when you tie it all together with the Bloch sphere and the matrix algebra gives 3 ways to look at it. Seeing it from 3 different aspects helps to cement the understanding.

1 comment
#errata/book-quantum-computing
0 481 1

First Post!

nihal.mehta

nihal.mehta

Author of Quantum Computing

Hi,
Yes, the NOT(X) is equivalent to U3(pi,0,pi) as you point out. Thanks for catching it.

I appreciate your kind words. Thank you. While I show that the qubelet model boils down to the Bloch Sphere, my objective though is to convince the reader to see that manipulating qubits is more intuitive using qubelets rather than juggling with the Bloch Sphere. This becomes especially more acute when you are working with multiple qubits.

Post #2

Popular Pragmatic topics Top

jeffmcompsci
PragProg Customers

Design and Build Great Web APIs: typo (page, 19, third bullet in URL list)
Title: Design and Build Great Web APIs - typo “https://company-atk.herokuapp.com/2258ie4t68jv” (page 19, third bullet in URL list) Typo:...
#errata#pragprog/book-design-and-build-great-web-apis
8 1916 7
New
Mmm
PragProg Customers

Hands-on Rust: Build depending on bracket-lib fails
Hi, build fails on: bracket-lib = “~0.8.1” when running on Mac Mini M1 Rust version 1.5.0: Compiling winit v0.22.2 error[E0308]: mi...
#question/book-hands-on-rust
1 1214 1
New
JohnS
PragProg Customers

Modern CSS with Tailwind: can’t setup the Rails source code
I can’t setup the Rails source code. This happens in a working directory containing multiple (postgres) Rails apps. With: ruby-3.0.0 s...
#question/book-modern-css-with-tailwind
0 1272 3
New
alanq
PragProg Customers

Modern Front-End Development for Rails: Can't get TURBO_STREAM format in some cases
This isn’t directly about the book contents so maybe not the right forum…but in some of the code apps (e.g. turbo/06) it sends a TURBO_ST...
#question/book-modern-front-end-development-for-rails
1 1364 7
New
Chrichton
PragProg Customers

Programming Phoenix LiveView: B03 (page 56-57) auth exercise
Dear Sophie. I tried to do the “Authorization” exercise and have two questions: When trying to plug in an email-service, I found the ...
#question/book-programming-phoenix-liveview
1 1179 3
New
leonW
PragProg Customers

Python Testing with pytest, Second Edition: File not Found Error (page 43)
I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...
#errata/book-python-testing-with-pytest-second-edition
5 4357 7
New
patoncrispy
PragProg Customers

Hands-on Rust: Adequate docs for bracket_lib
I’m new to Rust and am using this book to learn more as well as to feed my interest in game dev. I’ve just finished the flappy dragon exa...
#question/book-hands-on-rust
5 1480 3
New
jskubick
PragProg Customers

Kotlin and Android Development featuring Jetpack: SwitchCompat's thumbTint and trackTint being ignored (page 76)
I think I might have found a problem involving SwitchCompat, thumbTint, and trackTint. As entered, the SwitchCompat changes color to hol...
#errata/book-kotlin-and-android-development-featuring-jetpack
0 2619 2
New
nicoatridge
PragProg Customers

Kotlin and Android Development: Could not get unknown property ‘kotlin_version’…
Hi, I have just acquired Michael Fazio’s “Kotlin and Android Development” to learn about game programming for Android. I have a game in p...
/book-kotlin-and-android-development-featuring-jetpack
0 7956 6
New
NaplesDave
PragProg Customers

PragProg Customers Kotlin and Android Development: pg. 8 Build Gradle error: Could not get unknown property 'kotlin_version'
I am using Android Studio Chipmunk | 2021.2.1 Patch 2 Build #AI-212.5712.43.2112.8815526, built on July 10, 2022 Runtime version: 11.0....
#question/book-kotlin-and-android-development-featuring-jetpack
0 1389 2
New

Other popular topics Top

PragmaticBookshelf
Game Developer Forum>Learning Resources

Apple Game Frameworks and Technologies
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
pragprog.com
/swift#pragprog/book-apple-game-frameworks-and-technologies#published-book#macos#game-dev#ios#apple
30 3107 10
New
AstonJ
General Dev Chat

Which language or framework do you want to learn next?
Curious to know which languages and frameworks you’re all thinking about learning next :upside_down_face: Perhaps if there’s enough peop...
#community#learning
239 5590 90
New
Rainer
Journals & Book Clubs

Programming Erlang Book Club
My first contact with Erlang was about 2 years ago when I used RabbitMQ, which is written in Erlang, for my job. This made me curious and...
/erlang/book-programming-erlang-2nd-edition#book-club
195 6254 95
New
AstonJ
Hardware

GMK Serika Keycaps - Serika 2 available to order now!
I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl: The Ser...
/keyboards#keycaps#mechanical-keyboards
9 4195 7
New
PragmaticBookshelf
Backend Developer Forum>Learning Resources

Programming Phoenix LiveView
Build highly interactive applications without ever leaving Elixir, the way the experts do. Let LiveView take care of performance, scalabi...
pragprog.com
#pragprog/elixir/phoenix#published-book/book-programming-phoenix-liveview
61 2957 14
New
foxtrottwist
General Dev Chat

Warp—The blazingly fast, Rust-based terminal
A few weeks ago I started using Warp a terminal written in rust. Though in it’s current state of development there are a few caveats (tab...
/rust#terminal
52 4625 22
New
PragmaticBookshelf
Backend Developer Forum>Learning Resources

Agile Web Development with Rails 7
Rails 7 completely redefines what it means to produce fantastic user experiences and provides a way to achieve all the benefits of single...
pragprog.com
#pragprog#web-development/ruby/rails#published-book/book-agile-web-development-with-rails-7
32 3042 9
New
First poster: joeb
In The News

Safari now supports File System Access API with private origin
The File System Access API with Origin Private File System. WebKit supports new API that makes it possible for web apps to create, open,...
webkit.org
#safari#api
43 2826 21
New
PragmaticBookshelf
In The Spotlight

Spotlight: Sophie DeBenedetto (Author) Interview and AMA!
Author Spotlight: Sophie DeBenedetto @SophieDeBenedetto The days of the traditional request-response web application are long gone, b...
/elixir/phoenix#liveview/book-programming-phoenix-liveview
37 3018 14
New
PragmaticBookshelf
In The Spotlight

Spotlight: Noel Rappin (Author)
A Ruby-Centric Chat with Noel Rappin @noelrappin Once you start noodling around with Ruby you quickly figure out, as Noel Rappi...
/ruby/book-programming-ruby-3-2-5th-edition#author-spotlight/rails
41 2593 20
New
Back to top

Latest in PragProg

Hotwire Native for Rails Developers: Collected Errata from our class at the University of Chicago
PragProg Customers
Agile Web Development with Rails 7 p1.0—May2023: foreman Gem (page 73)
PragProg Customers
The Definitive ANTLR 4 Reference: No download link provided for TestSimple.java (Page 240)
PragProg Customers
Programming Phoenix LiveView: Wrong closing element tag (page 106)
PragProg Customers
Programming Phoenix LiveView: Typo (page 103)
PragProg Customers
Programming Phoenix LiveView: Wrong HTML comment tag in example (page 102)
PragProg Customers
Programming Phoenix LiveView: typo missing word (page 101)
PragProg Customers
Agile Web Development with Rails 8 B7.0: order_mailer_test failing (page 196)
PragProg Customers
Simplicity: Let’s Change Our World — Again
PragProg Customers
Simplicity: "detail"→"derail" (page 74, B2.0)
PragProg Customers
Agile Web Development with Rails 8: Page 9
PragProg Customers
Kotlin Coroutine Confidence: Code does not run (pg 225)
PragProg Customers
Agile Web Development with Rails 8 B7.0: partials folder (page 151)
PragProg Customers
Kotlin Coroutine Confidence: Change function name, maybe (pg 182)
PragProg Customers
Modern Front-End Development for Rails, Second Edition: can't get code to run
PragProg Customers
Kotlin Coroutine Confidence: Book & source code do not match (pg 180)
PragProg Customers
Kotlin Coroutine Confidence: Add formatter off/on comments (pg 162)
PragProg Customers
Kotlin Coroutine Confidence: What's the IntelliJ IDEA inspection? (pg 133 & 141)
PragProg Customers
Kotlin Coroutine Confidence: Add `parallel/v9` (pg 125)
PragProg Customers
Agile Web Development with Rails 8_B7.0 (pages 93/94)
PragProg Customers

View all threads ❯

Latest (all)

Write the most clever code you possibly can
In The News
Dasung Paperlike 13K is a 13.3 inch E Ink color monitor - Liliputing
In The News
V weekly.2025.19 released!
Backend News (official)
Wikidive - AI-Guided Wikipedia Exploration
AI In The News
Node.js v24.0.1 released!
Backend News (official)
Mind-reading AI recreates what you're looking at with amazing accuracy
AI In The News
Why do LLMs have emergent properties?
AI In The News
Announcing Ivar: Ruby’s Missing Instance Variable Typo Warnings
Backend In The News
DOGE software engineer’s computer infected by info-stealing malware
In The News
Google hits back after Apple exec says AI is hurting search
macOS In The News
Present and Future of Kotlin for Web
Backend News (official)
Plasma 6.3.5 update for Kubuntu 25.04 available via PPA
Linux News (official)
Elon Musk is responsible for “killing the world’s poorest children,” says Bill Gates
In The News
Memory Safety Features in Zig
Backend In The News
Hardening GitHub Actions: Lessons from Recent Attacks | Wiz Blog
In The News

View all threads ❯

We ❤️ helpful members!

We reward our most helpful members via our MOTM scheme - by giving away a whopping 25 books per year!

Member of the Month

Devtalk Sponsors

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

Erlang Solutions

We build trusted fault-tolerant systems that scale to billions of users.

Manning Publications

Develop your skills with books, videos, and courses.

AppSignal

Catch errors, track performance, monitor hosts and more.

WyeWorks

Enabling companies to succeed by building software people love.

Pragmatic Studio

Courses that'll move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

Categories:

Popular Portals

Devtalk Sponsors

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

Erlang Solutions

We build trusted fault-tolerant systems that scale to billions of users.

Manning Publications

Develop your skills with books, videos, and courses.

AppSignal

Catch errors, track performance, monitor hosts and more.

WyeWorks

Enabling companies to succeed by building software people love.

Pragmatic Studio

Courses that'll move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

We're in Beta

About us Mission Statement See our Roadmap