Do-It-Yourself Quantum Physics

Don’t just read about it. See the weirdness of quantum physics for yourself in the comfort of your kitchen, basement, or garage.

  • Demonstrate Quantum Encryption With a Flashlight and Pair of Sunglasses

    “Are you telling me that this could be of practical use?” exclaimed the Irish physicist John Bell. He had shown in the 1960s that quantum entanglement burrowed deep into the foundations of physics, but even he hadn’t thought it could have real-world applications. That was the brainstorm of Artur Ekert, then a graduate student at […]

  • How to Demonstrate “Twisted Light” Using a Laser Pointer

    In November 2003 I published a short news story in Scientific American about the orbital angular momentum of light and how you can glimpse it with a laser pointer and an overhead transparency. The article is no longer available at, so, as a service to fellow makers and citizen scientists, here are the instructions: […]

  • How to Build Your Own Quantum Entanglement Experiment, Part 2 (of 2)

    In my last post, I scrounged the parts for a very crude, but very cool, experiment you can do in your basement to demonstrate quantum entanglement. To my knowledge, it’s the cheapest and simplest such experiment ever done. It doesn’t give publishable results, but, to appropriate a line from Samuel Johnson, a homebrew entanglement experiment […]

  • How to Build Your Own Quantum Entanglement Experiment, Part 1 (of 2)

    Quantum entanglement experiments are not something you can buy in the science kit aisle at Toys ’R Us. The cheapest kit I know of is a marvel of miniaturization, but still costs 20,000 euros. In the past month, though, I’ve put together a crude version for just a few hundred dollars. It’s unbelievably simple—so simple […]

  • Hacking the Quantum: A New Book Explains How Anyone Can Become an Amateur Quantum Physicist

    For years I’ve been thinking and hoping that quantum physics would become the next hacker revolution. DIYers in their basements, garages, and hackerspaces have already pioneered radio communications, PCs, household robots, and cheap 3-D printers—why not quantum entanglement, cryptography, computers, and teleportation? In recent years, physics educators have streamlined quantum experiments to the point where […]

  • How to Build the World’s Simplest Particle Detector

    In about 10 minutes, using stuff you probably already have lying around your house, you can watch atomic nuclei and elementary particles for yourself using a diffusion cloud chamber—a rudimentary particle detector. There are lots of websites and YouTube videos giving step-by-step instructions to build such a chamber, but all require some component that’s hard […]

  • Do-it-yourself quantum spooky action

    DRESDEN, Germany—How cool would it be not just to read about the craziness of quantum mechanics, but to see it—even better, do it—for yourself? Several years ago I asked virtuoso experimental physicist Paul Kwiat whether he could develop a simple demonstration anyone could do at home, and he and his undergraduate student Rachel Killmer came […]