Category: Quantum Optics

Subtracting Photons from Arbitrary Light Fields

There’s been a fair bit of press for the article Subtracting photons from arbitrary light fields: experimental test of coherent state invariance by single-photon annihilation, published last month in the New Journal of Physics, much of it in roughly the same form as the news story in Physics World (which is published by the same… Continue reading Subtracting Photons from Arbitrary Light Fields

Applications of Quantum Mechanics

Over at the theoretical physics beach party, Moshe is talking about teaching quantum mechanics, specifically an elective course for upper-level undergraduates. He’s looking for some suggestions of special topics: The course it titled “Applications of quantum mechanics”, and is covering the second half of the text by David Griffiths, whose textbooks I find to be… Continue reading Applications of Quantum Mechanics

Freezing Coherent Field Growth in a Cavity by the Quantum Zeno Effect

When I saw ZapperZ’s post about this paper (arxiv version, expensive journal version) from the group of Serge Haroche in Paris, I thought it might be something I would need to incorporate into Chapter 5 of the book-in-progress. Happily, it’s much too technical to require extensive re-writing. Having taken the time to read it, though,… Continue reading Freezing Coherent Field Growth in a Cavity by the Quantum Zeno Effect

Quantum Computing Candidates: Optical Lattices

Last week, I wrote about ion traps as a possible quantum computing platform, which are probably the best established of the candidate technologies. This week, I’ll talk about something more speculative, but closer to my own areas of research: neutral atoms in optical lattices. This is a newer area, which pretty much starts with a… Continue reading Quantum Computing Candidates: Optical Lattices

God’s Atom

Doug Natelson is thinking about fortuitous physics, inspired by some solid state examples: Every now and then you stumble across a piece of physics, some detail about how the universe works, that is extremely lucky in some sense. For example, it’s very convenient that Si is a great semiconductor, and at the same time SiO2… Continue reading God’s Atom

Quantum Computing Candidates: Ion Traps

Some time back, I wrote about what you need to make a quantum computer. Given that it’s election season, I thought I’d revisit the topic by looking in detail at the candidate technologies for quantum computing. The first up is Ion Trap Quantum Computing, probably the most well-established of any of the candidates. The field… Continue reading Quantum Computing Candidates: Ion Traps

The Teleporter’s Dilemma

One of the annoying things about trying to explain quantum mechanics to a general audience is that the weirdness of the theory forces you to use incredibly convoluted examples. Pop-science books about quantum physics are full of schemes that the producers of the Saw movies would reject as implausibly complicated. I wish I was posting… Continue reading The Teleporter’s Dilemma